[883] | 1 | #include <stdlib.h> |
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| 2 | #include <float.h> |
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| 3 | #include <math.h> |
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| 4 | #include <limits.h> |
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| 5 | #include <string.h> |
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| 6 | #include <stdio.h> |
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| 7 | #include "GradientFilter.h" |
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| 8 | |
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| 9 | #ifndef SQR |
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| 10 | #define SQR(a) ((a) * (a)) |
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| 11 | #endif |
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| 12 | |
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| 13 | #define GRADIENTS_EXT ".grd" |
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| 14 | int g_numOfSlices[3] = { 256, 256, 256 }; |
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| 15 | void* g_volData = 0; |
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| 16 | float g_sliceDists[3]; |
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| 17 | |
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| 18 | #define SOBEL 1 |
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| 19 | #define GRAD_FILTER_SIZE 5 |
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| 20 | #define SIGMA2 5.0 |
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| 21 | #define MAX(a,b) ((a) > (b) ? (a) : (b)) |
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| 22 | #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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| 23 | #define EPS 1e-5f |
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| 24 | |
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| 25 | static char *getFloatGradientsFilename(void) |
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| 26 | { |
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| 27 | char floatExt[] = "_float"; |
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| 28 | char *filename; |
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| 29 | |
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| 30 | /* |
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| 31 | if (! (filename = (char *)malloc(strlen(g.basename) + |
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| 32 | strlen(floatExt) + |
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| 33 | strlen(GRADIENTS_EXT) + 1))) { |
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| 34 | */ |
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| 35 | if (! (filename = (char *)malloc(strlen("base") + |
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| 36 | strlen(floatExt) + |
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| 37 | strlen(GRADIENTS_EXT) + 1))) { |
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| 38 | fprintf(stderr, "not enough memory for filename\n"); |
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| 39 | exit(1); |
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| 40 | } |
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| 41 | |
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| 42 | //strcpy(filename, g.basename); |
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| 43 | strcpy(filename, "base"); |
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| 44 | |
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| 45 | strcat(filename, floatExt); |
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| 46 | strcat(filename, GRADIENTS_EXT); |
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| 47 | |
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| 48 | return filename; |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | static void saveFloatGradients(float *gradients, int *sizes) |
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| 53 | { |
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| 54 | char *filename; |
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| 55 | FILE *fp; |
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| 56 | |
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| 57 | filename = getFloatGradientsFilename(); |
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| 58 | if (! (fp = fopen(filename, "wb"))) { |
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| 59 | perror("cannot open gradients file for writing"); |
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| 60 | exit(1); |
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| 61 | } |
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| 62 | |
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| 63 | if (fwrite(gradients, 3 * sizes[0] * sizes[1] * sizes[2] * sizeof(float), |
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| 64 | 1, fp) != 1) { |
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| 65 | fprintf(stderr, "writing float gradients failed\n"); |
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| 66 | exit(1); |
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| 67 | } |
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| 68 | |
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| 69 | fclose(fp); |
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| 70 | } |
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| 71 | |
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| 72 | |
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| 73 | int getNextPowerOfTwo(int n) |
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| 74 | { |
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| 75 | int i; |
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| 76 | |
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| 77 | i = 1; |
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| 78 | while (i < n) { |
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| 79 | i *= 2; |
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| 80 | } |
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| 81 | |
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| 82 | return i; |
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| 83 | } |
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| 84 | |
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| 85 | static unsigned char getVoxel8(int x, int y, int z) |
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| 86 | { |
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| 87 | return ((unsigned char*)g_volData)[z * g_numOfSlices[0] * g_numOfSlices[1] + |
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| 88 | y * g_numOfSlices[0] + |
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| 89 | x]; |
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| 90 | } |
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| 91 | |
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| 92 | static unsigned short getVoxel16(int x, int y, int z) |
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| 93 | { |
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| 94 | return ((unsigned short*)g_volData)[z * g_numOfSlices[0] * g_numOfSlices[1] + |
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| 95 | y * g_numOfSlices[0] + |
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| 96 | x]; |
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| 97 | } |
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| 98 | |
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| 99 | static unsigned char getVoxelFloat(int x, int y, int z) |
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| 100 | { |
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| 101 | return ((float*)g_volData)[z * g_numOfSlices[0] * g_numOfSlices[1] + |
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| 102 | y * g_numOfSlices[0] + |
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| 103 | x]; |
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| 104 | } |
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| 105 | |
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| 106 | static float getVoxel(int x, int y, int z, DataType dataType) |
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| 107 | { |
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| 108 | switch (dataType) { |
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| 109 | case DATRAW_UCHAR: |
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| 110 | return (float)getVoxel8(x, y, z); |
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| 111 | break; |
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| 112 | case DATRAW_USHORT: |
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| 113 | return (float)getVoxel16(x, y, z); |
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| 114 | break; |
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| 115 | case DATRAW_FLOAT : |
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| 116 | return (float)getVoxelFloat(x, y, z); |
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| 117 | break; |
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| 118 | default: |
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| 119 | fprintf(stderr, "Unsupported data type\n"); |
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| 120 | exit(1); |
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| 121 | break; |
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| 122 | } |
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| 123 | return 0.0; |
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| 124 | } |
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| 125 | |
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| 126 | |
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| 127 | void computeGradients(float *gradients, void* volData, int *sizes, DataType dataType) |
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| 128 | { |
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| 129 | ::g_volData = volData; |
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| 130 | g_numOfSlices[0] = sizes[0]; |
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| 131 | g_numOfSlices[1] = sizes[1]; |
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| 132 | g_numOfSlices[2] = sizes[2]; |
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| 133 | |
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| 134 | g_sliceDists[0] = 1.0f / sizes[0]; |
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| 135 | g_sliceDists[1] = 1.0f / sizes[1]; |
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| 136 | g_sliceDists[2] = 1.0f / sizes[2]; |
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| 137 | |
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| 138 | int i, j, k, dir, di, vdi, idz, idy, idx; |
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| 139 | float *gp; |
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| 140 | |
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| 141 | static int weights[][3][3][3] = { |
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| 142 | {{{-1, -3, -1}, |
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| 143 | {-3, -6, -3}, |
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| 144 | {-1, -3, -1}}, |
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| 145 | {{ 0, 0, 0}, |
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| 146 | { 0, 0, 0}, |
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| 147 | { 0, 0, 0}}, |
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| 148 | {{ 1, 3, 1}, |
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| 149 | { 3, 6, 3}, |
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| 150 | { 1, 3, 1}}}, |
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| 151 | {{{-1, -3, -1}, |
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| 152 | { 0, 0, 0}, |
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| 153 | { 1, 3, 1}}, |
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| 154 | {{-3, -6, -3}, |
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| 155 | { 0, 0, 0}, |
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| 156 | { 3, 6, 3}}, |
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| 157 | {{-1, -3, -1}, |
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| 158 | { 0, 0, 0}, |
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| 159 | { 1, 3, 1}}}, |
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| 160 | {{{-1, 0, 1}, |
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| 161 | {-3, 0, 3}, |
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| 162 | {-1, 0, 1}}, |
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| 163 | {{-3, 0, 3}, |
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| 164 | {-6, 0, 6}, |
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| 165 | {-3, 0, 3}}, |
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| 166 | {{-1, 0, 1}, |
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| 167 | {-3, 0, 3}, |
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| 168 | {-1, 0, 1}}} |
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| 169 | }; |
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| 170 | |
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| 171 | fprintf(stderr, "computing gradients ... may take a while\n"); |
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| 172 | |
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| 173 | di = 0; |
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| 174 | vdi = 0; |
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| 175 | gp = gradients; |
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| 176 | for (idz = 0; idz < sizes[2]; idz++) { |
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| 177 | for (idy = 0; idy < sizes[1]; idy++) { |
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| 178 | for (idx = 0; idx < sizes[0]; idx++) { |
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| 179 | #if SOBEL == 1 |
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| 180 | if (idx > 0 && idx < sizes[0] - 1 && |
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| 181 | idy > 0 && idy < sizes[1] - 1 && |
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| 182 | idz > 0 && idz < sizes[2] - 1) { |
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| 183 | |
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| 184 | for (dir = 0; dir < 3; dir++) { |
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| 185 | gp[dir] = 0.0; |
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| 186 | for (i = -1; i < 2; i++) { |
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| 187 | for (j = -1; j < 2; j++) { |
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| 188 | for (k = -1; k < 2; k++) { |
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| 189 | gp[dir] += weights[dir][i + 1] |
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| 190 | [j + 1] |
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| 191 | [k + 1] * |
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| 192 | getVoxel(idx + i, |
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| 193 | idy + j, |
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| 194 | idz + k, |
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| 195 | dataType); |
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| 196 | } |
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| 197 | } |
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| 198 | } |
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| 199 | |
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| 200 | gp[dir] /= 2.0 * g_sliceDists[dir]; |
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| 201 | } |
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| 202 | } else { |
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| 203 | /* X-direction */ |
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| 204 | if (idx < 1) { |
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| 205 | gp[0] = (getVoxel(idx + 1, idy, idz, dataType) - |
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| 206 | getVoxel(idx, idy, idz, dataType))/ |
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| 207 | (g_sliceDists[0]); |
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| 208 | } else { |
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| 209 | gp[0] = (getVoxel(idx, idy, idz, dataType) - |
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| 210 | getVoxel(idx - 1, idy, idz, dataType))/ |
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| 211 | (g_sliceDists[0]); |
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| 212 | } |
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| 213 | |
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| 214 | /* Y-direction */ |
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| 215 | if (idy < 1) { |
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| 216 | gp[1] = (getVoxel(idx, idy + 1, idz, dataType) - |
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| 217 | getVoxel(idx, idy, idz, dataType))/ |
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| 218 | (g_sliceDists[1]); |
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| 219 | } else { |
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| 220 | gp[1] = (getVoxel(idx, idy, idz, dataType) - |
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| 221 | getVoxel(idx, idy - 1, idz, dataType))/ |
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| 222 | (g_sliceDists[1]); |
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| 223 | } |
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| 224 | |
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| 225 | /* Z-direction */ |
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| 226 | if (idz < 1) { |
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| 227 | gp[2] = (getVoxel(idx, idy, idz + 1, dataType) - |
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| 228 | getVoxel(idx, idy, idz, dataType))/ |
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| 229 | (g_sliceDists[2]); |
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| 230 | } else { |
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| 231 | gp[2] = (getVoxel(idx, idy, idz, dataType) - |
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| 232 | getVoxel(idx, idy, idz - 1, dataType))/ |
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| 233 | (g_sliceDists[2]); |
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| 234 | } |
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| 235 | } |
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| 236 | #else |
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| 237 | /* X-direction */ |
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| 238 | if (idx < 1) { |
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| 239 | gp[0] = (getVoxel(idx + 1, idy, idz, dataType) - |
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| 240 | getVoxel(idx, idy, idz, dataType))/ |
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| 241 | (g_sliceDists[0]); |
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| 242 | } else if (idx > g_numOfSlices[0] - 1) { |
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| 243 | gp[0] = (getVoxel(idx, idy, idz, dataType) - |
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| 244 | getVoxel(idx - 1, idy, idz, dataType))/ |
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| 245 | (g_sliceDists[0]); |
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| 246 | } else { |
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| 247 | gp[0] = (getVoxel(idx + 1, idy, idz, dataType) - |
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| 248 | getVoxel(idx - 1, idy, idz, dataType))/ |
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| 249 | (2.0 * g_sliceDists[0]); |
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| 250 | } |
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| 251 | |
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| 252 | /* Y-direction */ |
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| 253 | if (idy < 1) { |
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| 254 | gp[1] = (getVoxel(idx, idy + 1, idz, dataType) - |
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| 255 | getVoxel(idx, idy, idz, dataType))/ |
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| 256 | (g_sliceDists[1]); |
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| 257 | } else if (idy > g_numOfSlices[1] - 1) { |
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| 258 | gp[1] = (getVoxel(idx, idy, idz, dataType) - |
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| 259 | getVoxel(idx, idy - 1, idz, dataType))/ |
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| 260 | (g_sliceDists[1]); |
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| 261 | } else { |
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| 262 | gp[1] = (getVoxel(idx, idy + 1, idz, dataType) - |
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| 263 | getVoxel(idx, idy - 1, idz, dataType))/ |
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| 264 | (2.0 * g_sliceDists[1]); |
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| 265 | } |
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| 266 | |
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| 267 | /* Z-direction */ |
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| 268 | if (idz < 1) { |
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| 269 | gp[2] = (getVoxel(idx, idy, idz + 1, dataType) - |
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| 270 | getVoxel(idx, idy, idz, dataType))/ |
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| 271 | (g_sliceDists[2]); |
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| 272 | } else if (idz > g_numOfSlices[2] - 1) { |
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| 273 | gp[2] = (getVoxel(idx, idy, idz, dataType) - |
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| 274 | getVoxel(idx, idy, idz - 1, dataType))/ |
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| 275 | (g_sliceDists[2]); |
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| 276 | } else { |
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| 277 | gp[2] = (getVoxel(idx, idy, idz + 1, dataType) - |
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| 278 | getVoxel(idx, idy, idz - 1, dataType))/ |
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| 279 | (2.0 * g_sliceDists[2]); |
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| 280 | } |
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| 281 | #endif |
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| 282 | gp += 3; |
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| 283 | } |
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| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | } |
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| 288 | |
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| 289 | void filterGradients(float *gradients, int *sizes) |
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| 290 | { |
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| 291 | int i, j, k, idz, idy, idx, gi, ogi, filterWidth, n, borderDist[3]; |
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| 292 | float sum, *filteredGradients, ****filter; |
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| 293 | |
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| 294 | fprintf(stderr, "filtering gradients ... may also take a while\n"); |
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| 295 | |
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| 296 | if (! (filteredGradients = (float *)malloc(sizes[0] * sizes[1] * sizes[2] |
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| 297 | * 3 * sizeof(float)))) { |
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| 298 | fprintf(stderr, "not enough memory for filtered gradients\n"); |
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| 299 | exit(1); |
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| 300 | } |
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| 301 | |
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| 302 | /* Allocate storage for filter kernels */ |
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| 303 | if (! (filter = (float ****)malloc((GRAD_FILTER_SIZE/2 + 1) * |
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| 304 | sizeof(float ***)))) { |
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| 305 | fprintf(stderr, "failed to allocate gradient filter\n"); |
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| 306 | exit(1); |
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| 307 | } |
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| 308 | |
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| 309 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 310 | if (! (filter[i] = (float ***)malloc((GRAD_FILTER_SIZE) * |
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| 311 | sizeof(float **)))) { |
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| 312 | fprintf(stderr, "failed to allocate gradient filter\n"); |
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| 313 | exit(1); |
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| 314 | } |
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| 315 | } |
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| 316 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 317 | for (j = 0; j < GRAD_FILTER_SIZE; j++) { |
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| 318 | if (! (filter[i][j] = (float **)malloc((GRAD_FILTER_SIZE) * |
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| 319 | sizeof(float *)))) { |
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| 320 | fprintf(stderr, "failed to allocate gradient filter\n"); |
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| 321 | exit(1); |
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| 322 | } |
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| 323 | } |
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| 324 | } |
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| 325 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 326 | for (j = 0; j < GRAD_FILTER_SIZE; j++) { |
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| 327 | for (k = 0; k < GRAD_FILTER_SIZE; k++) { |
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| 328 | if (! (filter[i][j][k] = (float *)malloc((GRAD_FILTER_SIZE) * |
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| 329 | sizeof(float)))) { |
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| 330 | fprintf(stderr, "failed to allocate gradient filter\n"); |
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| 331 | exit(1); |
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| 332 | } |
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| 333 | } |
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| 334 | } |
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| 335 | } |
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| 336 | |
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| 337 | filterWidth = GRAD_FILTER_SIZE/2; |
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| 338 | |
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| 339 | /* Compute the filter kernels */ |
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| 340 | for (n = 0; n <= filterWidth; n++) { |
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| 341 | sum = 0.0f; |
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| 342 | for (k = -filterWidth; k <= filterWidth; k++) { |
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| 343 | for (j = -filterWidth; j <= filterWidth; j++) { |
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| 344 | for (i = -filterWidth; i <= filterWidth; i++) { |
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| 345 | sum += (filter[n][filterWidth + k] |
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| 346 | [filterWidth + j] |
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| 347 | [filterWidth + i] = |
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| 348 | exp(-(SQR(i) + SQR(j) + SQR(k)) / SIGMA2)); |
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| 349 | } |
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| 350 | } |
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| 351 | } |
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| 352 | for (k = -filterWidth; k <= filterWidth; k++) { |
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| 353 | for (j = -filterWidth; j <= filterWidth; j++) { |
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| 354 | for (i = -filterWidth; i <= filterWidth; i++) { |
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| 355 | filter[n][filterWidth + k] |
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| 356 | [filterWidth + j] |
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| 357 | [filterWidth + i] /= sum; |
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| 358 | } |
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| 359 | } |
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| 360 | } |
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| 361 | } |
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| 362 | |
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| 363 | gi = 0; |
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| 364 | /* Filter the gradients */ |
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| 365 | for (idz = 0; idz < sizes[2]; idz++) { |
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| 366 | for (idy = 0; idy < sizes[1]; idy++) { |
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| 367 | for (idx = 0; idx < sizes[0]; idx++) { |
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| 368 | borderDist[0] = MIN(idx, sizes[0] - idx - 1); |
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| 369 | borderDist[1] = MIN(idy, sizes[1] - idy - 1); |
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| 370 | borderDist[2] = MIN(idz, sizes[2] - idz - 1); |
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| 371 | |
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| 372 | filterWidth = MIN(GRAD_FILTER_SIZE/2, |
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| 373 | MIN(MIN(borderDist[0], |
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| 374 | borderDist[1]), |
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| 375 | borderDist[2])); |
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| 376 | |
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| 377 | for (n = 0; n < 3; n++) { |
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| 378 | filteredGradients[gi] = 0.0; |
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| 379 | for (k = -filterWidth; k <= filterWidth; k++) { |
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| 380 | for (j = -filterWidth; j <= filterWidth; j++) { |
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| 381 | for (i = -filterWidth; i <= filterWidth; i++) { |
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| 382 | ogi = (((idz + k) * sizes[1] + (idy + j)) * |
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| 383 | sizes[0] + (idx + i)) * 3 + |
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| 384 | n; |
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| 385 | filteredGradients[gi] += filter[filterWidth] |
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| 386 | [filterWidth + k] |
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| 387 | [filterWidth + j] |
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| 388 | [filterWidth + i] * |
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| 389 | gradients[ogi]; |
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| 390 | } |
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| 391 | } |
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| 392 | } |
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| 393 | gi++; |
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| 394 | } |
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| 395 | } |
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| 396 | } |
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| 397 | } |
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| 398 | |
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| 399 | /* Replace the orignal gradients by the filtered gradients */ |
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| 400 | memcpy(gradients, filteredGradients, |
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| 401 | sizes[0] * sizes[1] * sizes[2] * 3 * sizeof(float)); |
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| 402 | |
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| 403 | free(filteredGradients); |
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| 404 | |
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| 405 | /* free storage of filter kernel(s) */ |
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| 406 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 407 | for (j = 0; j < GRAD_FILTER_SIZE; j++) { |
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| 408 | for (k = 0; k < GRAD_FILTER_SIZE; k++) { |
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| 409 | free(filter[i][j][k]); |
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| 410 | } |
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| 411 | } |
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| 412 | } |
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| 413 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 414 | for (j = 0; j < GRAD_FILTER_SIZE; j++) { |
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| 415 | free(filter[i][j]); |
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| 416 | } |
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| 417 | } |
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| 418 | for (i = 0; i < GRAD_FILTER_SIZE/2 + 1; i++) { |
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| 419 | free(filter[i]); |
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| 420 | } |
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| 421 | free(filter); |
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| 422 | } |
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| 423 | |
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| 424 | |
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| 425 | void quantize8(float *grad, unsigned char *data) |
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| 426 | { |
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| 427 | float len; |
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| 428 | int i; |
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| 429 | |
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| 430 | len = sqrt(SQR(grad[0]) + SQR(grad[1]) + SQR(grad[2])); |
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| 431 | |
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| 432 | if (len < EPS) { |
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| 433 | grad[0] = grad[1] = grad[2] = 0.0; |
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| 434 | } else { |
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| 435 | grad[0] /= len; |
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| 436 | grad[1] /= len; |
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| 437 | grad[2] /= len; |
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| 438 | } |
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| 439 | |
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| 440 | for (i = 0; i < 3; i++) { |
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| 441 | data[i] = (unsigned char)((grad[i] + 1.0)/2.0 * UCHAR_MAX); |
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| 442 | } |
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| 443 | } |
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| 444 | |
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| 445 | void quantize16(float *grad, unsigned short *data) |
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| 446 | { |
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| 447 | float len; |
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| 448 | int i; |
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| 449 | |
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| 450 | len = sqrt(SQR(grad[0]) + SQR(grad[1]) + SQR(grad[2])); |
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| 451 | |
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| 452 | if (len < EPS) { |
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| 453 | grad[0] = grad[1] = grad[2] = 0.0; |
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| 454 | } else { |
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| 455 | grad[0] /= len; |
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| 456 | grad[1] /= len; |
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| 457 | grad[2] /= len; |
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| 458 | } |
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| 459 | |
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| 460 | for (i = 0; i < 3; i++) { |
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| 461 | data[i] = (unsigned short)((grad[i] + 1.0)/2.0 * USHRT_MAX); |
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| 462 | } |
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| 463 | } |
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| 464 | |
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| 465 | void quantizeFloat(float *grad, float *data) |
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| 466 | { |
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| 467 | float len; |
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| 468 | int i; |
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| 469 | |
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| 470 | len = sqrt(SQR(grad[0]) + SQR(grad[1]) + SQR(grad[2])); |
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| 471 | |
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| 472 | if (len < EPS) { |
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| 473 | grad[0] = grad[1] = grad[2] = 0.0; |
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| 474 | } else { |
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| 475 | grad[0] /= len; |
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| 476 | grad[1] /= len; |
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| 477 | grad[2] /= len; |
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| 478 | } |
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| 479 | |
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| 480 | for (i = 0; i < 3; i++) { |
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| 481 | data[i] = (float)((grad[i] + 1.0)/2.0); |
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| 482 | } |
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| 483 | } |
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| 484 | |
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| 485 | void quantizeGradients(float *gradientsIn, void *gradientsOut, |
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| 486 | int *sizes, DataType dataType) |
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| 487 | { |
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| 488 | |
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| 489 | int idx, idy, idz, di; |
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| 490 | |
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| 491 | di = 0; |
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| 492 | for (idz = 0; idz < sizes[2]; idz++) { |
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| 493 | for (idy = 0; idy < sizes[1]; idy++) { |
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| 494 | for (idx = 0; idx < sizes[0]; idx++) { |
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| 495 | switch (dataType) { |
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| 496 | case DATRAW_UCHAR: |
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| 497 | quantize8(&gradientsIn[di], |
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| 498 | &((unsigned char*)gradientsOut)[di]); |
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| 499 | break; |
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| 500 | case DATRAW_USHORT: |
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| 501 | quantize16(&gradientsIn[di], |
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| 502 | &((unsigned short*)gradientsOut)[di]); |
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| 503 | break; |
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| 504 | case DATRAW_FLOAT: |
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| 505 | quantizeFloat(&gradientsIn[di], |
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| 506 | &((float*)gradientsOut)[di]); |
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| 507 | break; |
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| 508 | default: |
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| 509 | fprintf(stderr, "unsupported data type\n"); |
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| 510 | break; |
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| 511 | } |
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| 512 | di += 3; |
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| 513 | } |
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| 514 | } |
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| 515 | } |
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| 516 | } |
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| 517 | /* |
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| 518 | |
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| 519 | void saveGradients(void *gradients, int *sizes, DataType dataType) |
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| 520 | { |
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| 521 | char *filename; |
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| 522 | int size; |
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| 523 | FILE *fp; |
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| 524 | |
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| 525 | filename = getGradientsFilename(); |
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| 526 | if (! (fp = fopen(filename, "wb"))) { |
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| 527 | perror("cannot open gradients file for writing"); |
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| 528 | exit(1); |
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| 529 | } |
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| 530 | |
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| 531 | size = 3 * sizes[0] * sizes[1] * sizes[2] |
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| 532 | * getDataTypeSize(dataType); |
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| 533 | |
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| 534 | if (fwrite(gradients, size, 1, fp) != 1) { |
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| 535 | fprintf(stderr, "writing gradients failed\n"); |
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| 536 | exit(1); |
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| 537 | } |
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| 538 | |
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| 539 | fclose(fp); |
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| 540 | } |
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| 541 | */ |
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