Bibliothèque de traitements d'images en virgule flottante.
http://la.buvette.org/photos/cumul/
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103 lines
2.4 KiB
103 lines
2.4 KiB
/*
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* classif.c
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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 <math.h>
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#include "../floatimg.h"
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extern int verbosity;
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/* --------------------------------------------------------------------- */
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/* nouveau 2 octobre 2020, juste avant sonoptic de la pluie craignos */
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int fimg_classif_trial(FloatImg *psrc, FloatImg *pdst, float fval, int notused)
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{
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float minmax[6], delta[3], baryc[3];
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float range, dist, rgb[3], dr, dg, db;
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int x, y, on, off;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %f %d )\n", __func__,
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psrc, pdst, fval, notused);
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#endif
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if (FIMG_TYPE_RGB != psrc->type) {
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fprintf(stderr, "%s: bad src type %d\n", __func__, psrc->type);
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return -7;
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}
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if (fimg_images_not_compatible(psrc, pdst)) {
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fprintf(stderr, "%s: bad dst type %d\n", __func__, pdst->type);
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return -8;
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}
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/* calculer les amplitudes RGB de l'image source */
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fimg_get_minmax_rgb(psrc, minmax);
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delta[0] = minmax[1] - minmax[0];
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delta[1] = minmax[3] - minmax[2];
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delta[2] = minmax[5] - minmax[4];
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/* chercher le plus petit des deltas */
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range = delta[0]; if (delta[1]<range) range=delta[1];
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if (delta[2]<range) range=delta[2];
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/* convertir le diametre en rayon (magic inside) */
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range *= fval;
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if (verbosity > 1) fprintf(stderr, "deltas : %f %f %f / %f\n",
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delta[0], delta[1], delta[2], range);
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/* calcul du "barycentre" chromatique */
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baryc[0] = (minmax[1] + minmax[0]) / 2;
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baryc[1] = (minmax[3] + minmax[2]) / 2;
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baryc[2] = (minmax[5] + minmax[4]) / 2;
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if (verbosity > 1) fprintf(stderr, "barycs : %f %f %f\n",
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baryc[0], baryc[1], baryc[2]);
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on = off = 0;
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for (y=0; y<psrc->height; y++) {
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for (x=0; x<psrc->width; x++) {
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fimg_get_rgb(psrc, x, y, rgb);
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/* calcul de la distance chromatique */
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dr = rgb[0] - baryc[0];
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dg = rgb[1] - baryc[1];
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db = rgb[2] - baryc[2];
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dist = sqrtf( (dr*dr) + (dg*dg) + (db*db) );
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#if DEBUG_LEVEL
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if (x==y) fprintf(stderr, "%4d %4d %f\n", x, y, dist);
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#endif
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/* action !!! */
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if (dist > range) {
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/* make our pixel gray-level */
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rgb[0] = rgb[1] = rgb[2] = 0.0;
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// (rgb[0] + rgb[1] + rgb[2]) / 3.0;
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on++;
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}
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else {
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/* the easy part : do nothing */
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off++;
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}
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fimg_put_rgb(pdst, x, y, rgb);
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/* MUST BE MORE CREATIVE HERE !!! */
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}
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}
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if (verbosity > 1) fprintf(stderr, "on %d off %d\n", on, off);
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return 0;
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}
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/* --------------------------------------------------------------------- */
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