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trying some contrast funcs...

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Tonton Th 2019-11-12 00:20:28 +01:00
parent efac70ab2d
commit 2ee1645a4a
3 changed files with 97 additions and 48 deletions
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5
lib/Makefile
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@ -5,7 +5,7 @@
COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
OBJS = fimg-core.o fimg-pnm.o fimg-file.o fimg-math.o \
fimg-timers.o operators.o fimg-2gray.o \
interpolate.o fimg-compare.o
interpolate.o fimg-compare.o contrast.o
DEPS = Makefile ../floatimg.h
@ -34,6 +34,9 @@ fimg-2gray.o: fimg-2gray.c $(DEPS)
operators.o: operators.c $(DEPS)
gcc $(COPT) -c $<
contrast.o: contrast.c $(DEPS)
gcc $(COPT) -c $<
interpolate.o: interpolate.c $(DEPS)
gcc $(COPT) -c $<

64
lib/contrast.c Normal file
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@ -0,0 +1,64 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "../floatimg.h"
extern int verbosity;
/* ---------------------------------------------------------------- */
int fimg_square_root(FloatImg *s, FloatImg *d, double maxval)
{
int nbre, idx;
double dval;
if (s->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s : type %d invalide\n",
__func__, s->type);
return -4;
}
if (NULL==d) {
d = s;
}
nbre = s->width * s->height * 3;
for (idx=0; idx<nbre; idx++) {
dval = s->R[idx] / maxval;
d->R[idx] = maxval * sqrt(dval);
}
return -1;
}
/* ---------------------------------------------------------------- */
int fimg_power_2(FloatImg *s, FloatImg *d, double maxval)
{
int nbre, idx;
double dval;
if (s->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s : type %d invalide\n",
__func__, s->type);
return -4;
}
if (NULL==d) {
d = s;
}
nbre = s->width * s->height * 3;
for (idx=0; idx<nbre; idx++) {
dval = s->R[idx] / maxval;
d->R[idx] = maxval * dval * dval;
}
return -1;
}
/* ---------------------------------------------------------------- */

76
lib/t.c
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@ -67,71 +67,53 @@ fimg_destroy(&gray);
return 0;
}
/* ---------------------------------------------------------------- */
/****
foo = fimg_create(&dessin, W, H, 3);
petit_dessin(&dessin);
foo = fimg_create(&noise, W, H, 3);
fimg_drand48(&noise, 0.1);
****/
int fimg_square_root(FloatImg *s, FloatImg *d, double maxval);
int fimg_power_2(FloatImg *s, FloatImg *d, double maxval);
int essai_contraste(char *fname)
{
int foo;
FloatImg dessin;
double maxi;
foo = fimg_create_from_dump(fname, &dessin);
maxi = (double)fimg_get_maxvalue(&dessin);
fprintf(stderr, "avant valeur maxi = %f\n", maxi);
fimg_power_2(&dessin, NULL, maxi);
maxi = (double)fimg_get_maxvalue(&dessin);
fprintf(stderr, "apres valeur maxi = %f\n", maxi);
fimg_dump_to_file(&dessin, "dst.fimg", 0);
fimg_destroy(&dessin);
return -1;
}
/* ---------------------------------------------------------------- */
#define W 320
#define H 240
int main(int argc, char *argv[])
{
int foo, idx, opt;
float coef;
FloatImg dessin, noise, result;
char outname[100];
// char outname[100];
int gray = 0;
int nb_img = 42;
while ((opt = getopt(argc, argv, "gn:v")) != -1) {
switch(opt) {
case 'g': gray++; break;
case 'n': nb_img=atoi(optarg); break;
case 'n': foo=atoi(optarg); break;
case 'v': verbosity++; break;
}
}
if (verbosity) fimg_print_version(0);
foo = essai_contraste("src.fimg");
foo = fimg_create_from_png("/home/tth/TMP/floatimg/s1.png", &dessin);
if (foo) {
fprintf(stderr, "s1 load err %d\n", foo);
exit(1);
}
if (verbosity) fimg_describe(&dessin, "s1 dessin");
if (gray) fimg_to_gray(&dessin);
foo = fimg_create_from_png("/home/tth/TMP/floatimg/s2.png", &noise);
if (foo) {
fprintf(stderr, "s2 load err %d\n", foo);
exit(1);
}
if (verbosity) fimg_describe(&noise, "s2 noise");
fimg_mul_cste(&noise, 0.50);
if (gray) fimg_to_gray(&noise);
foo = fimg_create(&result, W, H, 3);
if (verbosity) fimg_describe(&result, "d result");
fprintf(stderr, "running for %d picz\n", nb_img);
for (idx=0; idx<nb_img; idx++) {
coef = (float)idx / (float)nb_img;
// coef = (0.5-0.5*cos(4*3.141592654*coef));
foo = fimg_interpolate(&dessin, &noise, &result, coef);
printf("%6d %9.6f\n", idx, coef);
sprintf(outname, "/home/tth/TMP/floatimg/%05d.pnm", idx);
foo = fimg_save_as_pnm(&result, outname, 0);
}
/* yes, we can cleanup after work */
fimg_destroy(&dessin), fimg_destroy(&noise), fimg_destroy(&result);
return 0;
}