forked from tTh/FloatImg
fix a critical precision issue
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98043bbe0c
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252d5c62e0
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@ -47,21 +47,24 @@ return maxval;
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int fimg_meanvalues(FloatImg *head, float means[4])
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int fimg_meanvalues(FloatImg *head, float means[4])
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{
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{
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int idx, surface;
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int idx, surface;
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double accus[4];
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surface = head->width * head->height;
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surface = head->width * head->height;
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if (surface < 1) return -1;
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if (surface < 1) return -1;
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memset(means, 0, 4*sizeof(float));
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memset(accus, 0, 4*sizeof(double));
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for (idx=0; idx<surface; idx++) {
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for (idx=0; idx<surface; idx++) {
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means[0] += head->R[idx];
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accus[0] += head->R[idx];
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if (head->type > 2) {
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if (head->type > 2) {
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means[1] += head->G[idx];
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accus[1] += head->G[idx];
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means[2] += head->B[idx];
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accus[2] += head->B[idx];
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}
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}
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}
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}
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for (idx=0; idx<4; idx++) means[idx] /= (float)surface;
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for (idx=0; idx<4; idx++) {
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means[idx] = (float)(accus[idx]/(double)surface);
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}
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return 0;
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return 0;
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}
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}
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