68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
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* FLOATIMG
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* fabriquer une pseudo-image thermique
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*
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* new: Wed Mar 20 16:55:09 UTC 2024 dans ma maison du Gers
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "../floatimg.h"
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extern int verbosity;
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/* --------------------------------------------------------------------- */
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/*
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* parameter k in not used, but may be in the futur.
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*/
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int fimg_auto_thermique(FloatImg *src, FloatImg *dst, int k)
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{
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// int x, y, off;
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int idx, surface;
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float seuil, gray;
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double graymean;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__, src, dst, k);
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#endif
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if (0!=k) {
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fprintf(stderr, "%s: k must be 0, was %d\n", __func__, k);
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}
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surface = src->width * src->height;
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// fprintf(stderr, "surface = %d\n", surface);
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graymean = 0.0;
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for (idx=0; idx<surface; idx++) {
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gray = src->R[idx] + src->G[idx] + src->B[idx];
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graymean += (double)gray;
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}
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seuil = (float) (graymean / surface);
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// fprintf(stderr, "graymean = %f seuil = %f\n", graymean, seuil);
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/*
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* please, explain this number brotching
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*/
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for (idx=0; idx<surface; idx++) {
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gray = src->R[idx] + src->G[idx] + src->B[idx];
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if (gray > seuil) {
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dst->R[idx] = gray - seuil;
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dst->B[idx] = seuil / 8.0;
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}
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else {
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dst->G[idx] = gray;
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dst->B[idx] = seuil / 8.0;
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}
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}
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return 0;
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}
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/* --------------------------------------------------------------------- */
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