409 lines
9.3 KiB
C
409 lines
9.3 KiB
C
/*
|
||
* fimg-math.c
|
||
*
|
||
*
|
||
*/
|
||
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <stdint.h>
|
||
#include <unistd.h>
|
||
#include <string.h>
|
||
#include <float.h> /* for FLT_MAX */
|
||
#include <math.h>
|
||
|
||
#include "../floatimg.h"
|
||
|
||
extern int verbosity; /* must be declared around main() */
|
||
|
||
/* ---------------------------------------------------------------- */
|
||
/* nouveau 27 fevrier 2022 */
|
||
float fimg_get_plane_maxvalue(FloatImg *psrc, char plane)
|
||
{
|
||
float *ptrplane;
|
||
float maxval;
|
||
int area, foo;
|
||
|
||
#if DEBUG_LEVEL
|
||
fprintf(stderr, ">>> %s ( %p '%c' )\n", __func__, psrc, plane);
|
||
#endif
|
||
|
||
switch (plane) {
|
||
case 'r': case 'R':
|
||
ptrplane = psrc->R; break;
|
||
case 'g': case 'G':
|
||
ptrplane = psrc->G; break;
|
||
case 'b': case 'B':
|
||
ptrplane = psrc->B; break;
|
||
case 'a': case 'A':
|
||
ptrplane = psrc->A; break;
|
||
default:
|
||
fprintf(stderr, "%s: plane error\n", __func__);
|
||
abort(); break;
|
||
}
|
||
|
||
area = psrc->width * psrc->height;
|
||
maxval = 0.0;
|
||
|
||
for (foo=0; foo<area; foo++) {
|
||
if (ptrplane[foo] > maxval) maxval = ptrplane[foo];
|
||
}
|
||
|
||
return maxval;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
float fimg_get_maxvalue(FloatImg *head)
|
||
{
|
||
float maxval;
|
||
int foo, surface;
|
||
|
||
if (head->type != FIMG_TYPE_RGB && head->type != FIMG_TYPE_GRAY) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, head->type);
|
||
return nanf("wtf ?");
|
||
}
|
||
|
||
maxval = 0.0; /* no negative values allowed */
|
||
|
||
surface = head->width*head->height;
|
||
|
||
switch (head->type) {
|
||
case FIMG_TYPE_RGB:
|
||
for (foo=0; foo<surface; foo++) {
|
||
if (head->R[foo] > maxval) maxval = head->R[foo];
|
||
if (head->G[foo] > maxval) maxval = head->G[foo];
|
||
if (head->B[foo] > maxval) maxval = head->B[foo];
|
||
}
|
||
break;
|
||
case FIMG_TYPE_GRAY:
|
||
for (foo=0; foo<surface; foo++) {
|
||
if (head->R[foo] > maxval) maxval = head->R[foo];
|
||
}
|
||
break;
|
||
}
|
||
|
||
return maxval;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
/*
|
||
* mmval[0] <- min(R) mmval[1] <- max(R)
|
||
*/
|
||
int fimg_get_minmax_rgb(FloatImg *head, float mmvals[6])
|
||
{
|
||
int idx, surface;
|
||
float fval;
|
||
|
||
if (head->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, head->type);
|
||
return -2;
|
||
}
|
||
|
||
surface = head->width * head->height;
|
||
mmvals[0] = FLT_MAX; mmvals[1] = -FLT_MAX;
|
||
mmvals[2] = FLT_MAX; mmvals[3] = -FLT_MAX;
|
||
mmvals[4] = FLT_MAX; mmvals[5] = -FLT_MAX;
|
||
|
||
for (idx=0; idx<surface; idx++) {
|
||
fval = head->R[idx];
|
||
if (fval < mmvals[0]) mmvals[0] = fval;
|
||
else if (fval > mmvals[1]) mmvals[1] = fval;
|
||
fval = head->G[idx];
|
||
if (fval < mmvals[2]) mmvals[2] = fval;
|
||
else if (fval > mmvals[3]) mmvals[3] = fval;
|
||
fval = head->B[idx];
|
||
if (fval < mmvals[4]) mmvals[4] = fval;
|
||
else if (fval > mmvals[5]) mmvals[5] = fval;
|
||
}
|
||
|
||
return -0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
int fimg_meanvalues(FloatImg *head, float means[4])
|
||
{
|
||
int idx, surface;
|
||
double accus[4];
|
||
|
||
surface = head->width * head->height;
|
||
if (surface < 1) return -1;
|
||
|
||
memset(accus, 0, 4*sizeof(double));
|
||
|
||
for (idx=0; idx<surface; idx++) {
|
||
accus[0] += (double)head->R[idx];
|
||
if (head->type > 2) { /* WTF ? */
|
||
accus[1] += (double)head->G[idx];
|
||
accus[2] += (double)head->B[idx];
|
||
}
|
||
}
|
||
|
||
for (idx=0; idx<4; idx++) {
|
||
means[idx] = (float)(accus[idx]/(double)surface);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
/* d'après Wikipedia Fr :
|
||
| c = 0
|
||
| s = x1
|
||
| pour j de 2 à n
|
||
| s = s+xj
|
||
| c = c+(j xj − s)2/(j(j−1))
|
||
| renvoyer c/n
|
||
|
||
Mais c,a ne semble pas etre la bonne methode. Il faut aller voir :
|
||
https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
|
||
*/
|
||
/* ---------------------------------------------------------------- */
|
||
/*
|
||
* more elaborate functions are in fimg-2gray.c
|
||
*/
|
||
int fimg_to_gray(FloatImg *head)
|
||
{
|
||
float add;
|
||
int foo;
|
||
|
||
if (head->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, head->type);
|
||
return -3;
|
||
}
|
||
|
||
for (foo=0; foo<(head->width*head->height); foo++) {
|
||
add = head->R[foo];
|
||
add += head->G[foo];
|
||
add += head->B[foo];
|
||
head->R[foo] = head->G[foo] = head->B[foo] = add / 3.0;
|
||
}
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
int fimg_add_cste(FloatImg *fi, float value)
|
||
{
|
||
int nbre, idx;
|
||
|
||
if (fi->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -44;
|
||
}
|
||
|
||
nbre = fi->width * fi->height ;
|
||
#if DEBUG_LEVEL
|
||
fprintf(stderr, "%s, nbre is %d\n", __func__, nbre);
|
||
#endif
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] += value;
|
||
fi->G[idx] += value;
|
||
fi->B[idx] += value;
|
||
}
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
long fimg_count_negativ(FloatImg *fi)
|
||
{
|
||
int nbre, idx;
|
||
long count;
|
||
|
||
if (fi->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -1;
|
||
}
|
||
|
||
nbre = fi->width * fi->height;
|
||
|
||
count = 0;
|
||
for (idx=0; idx<nbre; idx++) {
|
||
if (fi->R[idx] < 0.0) count++;
|
||
if (fi->G[idx] < 0.0) count++;
|
||
if (fi->B[idx] < 0.0) count++;
|
||
}
|
||
|
||
return count;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
/* nouveau 29 fevrier 2020 */
|
||
long fimg_clamp_negativ(FloatImg *fi)
|
||
{
|
||
int nbre, idx;
|
||
long count;
|
||
|
||
if (fi->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -1;
|
||
}
|
||
|
||
nbre = fi->width * fi->height;
|
||
|
||
count = 0;
|
||
for (idx=0; idx<nbre; idx++) {
|
||
if (fi->R[idx] < 0.0) {
|
||
fi->R[idx] = 0.0; count++;
|
||
}
|
||
if (fi->G[idx] < 0.0) {
|
||
fi->G[idx] = 0.0; count++;
|
||
}
|
||
if (fi->B[idx] < 0.0) {
|
||
fi->B[idx] = 0.0; count++;
|
||
}
|
||
}
|
||
|
||
/* WTF 12 avril 2020, valgrind me cause mal ?
|
||
==28943== Conditional jump or move depends on uninitialised value(s)
|
||
==28943== at 0x4045E9: fimg_clamp_negativ (fimg-math.c:208)
|
||
==28943== by 0x4018C9: essai_filtrage_3x3 (t.c:128)
|
||
==28943== by 0x4024D5: main (t.c:444)
|
||
==28943== Uninitialised value was created by a heap allocation
|
||
==28943== at 0x483577F: malloc (vg_replace_malloc.c:299)
|
||
==28943== by 0x40284D: fimg_create (fimg-core.c:107)
|
||
==28943== by 0x402AB3: fimg_clone (fimg-core.c:174)
|
||
==28943== by 0x401861: essai_filtrage_3x3 (t.c:118)
|
||
==28943== by 0x4024D5: main (t.c:444)
|
||
*/
|
||
|
||
return count;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
int fimg_mul_cste(FloatImg *fi, float value)
|
||
{
|
||
int nbre, idx;
|
||
|
||
if ( (fi->type != FIMG_TYPE_RGB) && (fi->type != FIMG_TYPE_GRAY) ) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -44;
|
||
}
|
||
|
||
nbre = fi->width * fi->height;
|
||
#if DEBUG_LEVEL
|
||
fprintf(stderr, "%s, nbre of datum is %d\n", __func__, nbre);
|
||
#endif
|
||
if (fi->type == FIMG_TYPE_RGB) {
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] *= value;
|
||
fi->G[idx] *= value;
|
||
fi->B[idx] *= value;
|
||
}
|
||
}
|
||
if (fi->type == FIMG_TYPE_GRAY) {
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] *= value;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
/* nouveau 17 septembre 2022 */
|
||
int fimg_div_cste(FloatImg *fi, float value)
|
||
{
|
||
int nbre, idx;
|
||
|
||
if ( (fi->type != FIMG_TYPE_RGB) && (fi->type != FIMG_TYPE_GRAY) ) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -44;
|
||
}
|
||
|
||
nbre = fi->width * fi->height;
|
||
if (fi->type == FIMG_TYPE_RGB) {
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] /= value;
|
||
fi->G[idx] /= value;
|
||
fi->B[idx] /= value;
|
||
}
|
||
}
|
||
if (fi->type == FIMG_TYPE_GRAY) {
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] /= value;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
/*
|
||
* oh, please explain the usecase of this function !
|
||
*/
|
||
int fimg_ajust_from_grab(FloatImg *fi, double maxima, int notused)
|
||
{
|
||
double coef;
|
||
|
||
if (notused) {
|
||
fprintf(stderr, "notused was %d, must be 0 in %s\n",
|
||
notused, __func__);
|
||
}
|
||
|
||
if (fi->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return -99;
|
||
}
|
||
|
||
if (fi->count < 1) {
|
||
fprintf(stderr, "%s : count %d is invalid\n", __func__, fi->count);
|
||
return -98;
|
||
}
|
||
|
||
/*
|
||
* mmmm, is this real ?
|
||
* how to accuratly check the value of 'I.fval' ?
|
||
*/
|
||
coef = 1.0 / ((double)fi->count * (double)fi->fval);
|
||
|
||
if (verbosity) {
|
||
fprintf(stderr, "image @ %p\n", fi);
|
||
fprintf(stderr, "fval %f\n", fi->fval);
|
||
fprintf(stderr, "count %d\n", fi->count);
|
||
fprintf(stderr, "maxima %f\n", maxima);
|
||
fprintf(stderr, "coef %f\n", coef);
|
||
}
|
||
|
||
fimg_mul_cste(fi, coef);
|
||
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
int fimg_absolute(FloatImg *fi)
|
||
{
|
||
int surface, idx;
|
||
|
||
surface = fi->width * fi->height;
|
||
|
||
for (idx=0; idx<surface; idx++) {
|
||
fi->R[idx] = fabsf(fi->R[idx]);
|
||
fi->G[idx] = fabsf(fi->G[idx]);
|
||
fi->B[idx] = fabsf(fi->B[idx]);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
/* Warning: this function is _very_ slow */
|
||
void fimg_drand48(FloatImg *fi, float kmul)
|
||
{
|
||
int nbre, idx;
|
||
|
||
#if DEBUG_LEVEL
|
||
fprintf(stderr, ">>> %s ( %p %g )\n", __func__, fi, kmul);
|
||
#endif
|
||
|
||
if (fi->type != FIMG_TYPE_RGB) {
|
||
fprintf(stderr, "%s : type %d invalide\n",
|
||
__func__, fi->type);
|
||
return;
|
||
}
|
||
nbre = fi->width * fi->height;
|
||
for (idx=0; idx<nbre; idx++) {
|
||
fi->R[idx] = drand48() * kmul;
|
||
fi->G[idx] = drand48() * kmul;
|
||
fi->B[idx] = drand48() * kmul;
|
||
}
|
||
|
||
}
|
||
/* ---------------------------------------------------------------- */
|
||
|
||
|