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//
// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
//
// This software may be used and distributed according to the terms
// of the GNU General Public License, incorporated herein by reference.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <gsl/gsl_multifit.h>
#include <Fl/Fl.H>
#include "OutputImage.H"
#include "Stitch.H"
#define MIN(A,B) ((A)<(B)?(A):(B))
static double pi_d = asin(1.0) * 2.0;
static double deg2rad = pi_d / 180.0;
Stitch::Stitch() {
for (int i=0; i<MAX_PICS; i++) {
gipf[i] = NULL;
single_images[i] = NULL;
}
merged_image = NULL;
}
Stitch::~Stitch() {
for (int i=0; i<MAX_PICS; i++) {
if (gipf[i]) {
delete(gipf[i]);
} else {
break;
}
}
}
int
Stitch::load_image(char *file) {
for (int i=0; i<MAX_PICS; i++) {
if (gipf[i] == NULL) {
gipf[i] = new GipfelWidget(0, 0, 800, 600);
if (gipf[i]->load_image(file) != 0) {
delete gipf[i];
gipf[i] = NULL;
}
break;
}
}
return 0;
}
OutputImage*
Stitch::set_output(OutputImage *img) {
OutputImage *ret = merged_image;
merged_image = img;
return ret;
}
OutputImage*
Stitch::set_output(const char *file, OutputImage *img) {
OutputImage *ret = NULL;
for (int i=0; i<MAX_PICS; i++) {
if (gipf[i] != NULL) {
const char *img_file = gipf[i]->get_image_filename();
if (img_file && strcmp(file, img_file) == 0) {
ret = single_images[i];
single_images[i] = img;
break;
}
}
}
return ret;
}
int
Stitch::vignette_calib(GipfelWidget::sample_mode_t m,
int w, int h, double view_start, double view_end) {
view_start = view_start * deg2rad;
view_end = view_end * deg2rad;
double step_view = (view_end - view_start) / w;
uchar r, g, b;
int y_off = h / 2;
int merged_pixel_set;
double radius = (double) w / (view_end -view_start);
double V1 = 6.220359, V2 = -13.874930, V3 = 9.992582;
int max_samples = 10000, n_samples = 0;
gsl_matrix *X, *cov;
gsl_vector *yv, *c;
double chisq;
X = gsl_matrix_alloc(max_samples, 3);
yv = gsl_vector_alloc(max_samples);
c = gsl_vector_alloc(3);
cov = gsl_matrix_alloc (3, 3);
for (int y=0; y<h; y++) {
double a_nick = atan((double)(y_off - y)/radius);
for (int x=0; x<w; x++) {
double a_view;
a_view = view_start + x * step_view;
double l1 = 0.0, l2 = 0.0;
double a1, a2;
for (int i=0; i<MAX_PICS; i++) {
if (gipf[i] == NULL) {
break;
} else if (gipf[i]->get_pixel(m, a_view, a_nick,
&r, &g, &b) == 0) {
l2 = (double) r + g + b;
a2 = fabs(gipf[i]->get_angle_off(a_view, a_nick));
if (l1 > 0.0 && n_samples < max_samples) {
gsl_matrix_set(X, n_samples, 0, l1 * a1 - l2 * a2);
gsl_matrix_set(X, n_samples, 1, l1 * a1 * a1 - l2 * a2 * a2);
gsl_matrix_set(X, n_samples, 2, l1 * a1 * a1 * a1 - l2 * a2 * a2 * a2);
gsl_vector_set(yv, n_samples, l1 - l2);
n_samples++;
}
l1 = l2;
a1 = a2;
}
}
}
}
gsl_multifit_linear_workspace * work
= gsl_multifit_linear_alloc (n_samples, 3);
gsl_multifit_linear (X, yv, c, cov, &chisq, work);
gsl_multifit_linear_free (work);
fprintf(stderr, "===> v1 %lf, v2 %lf, v3 %lf (i %d)\n",
gsl_vector_get(c,0), gsl_vector_get(c,1), gsl_vector_get(c,2), n_samples);
return 0;
}
int
Stitch::resample(GipfelWidget::sample_mode_t m,
int w, int h, double view_start, double view_end) {
view_start = view_start * deg2rad;
view_end = view_end * deg2rad;
double step_view = (view_end - view_start) / w;
uchar r, g, b;
int y_off = h / 2;
int merged_pixel_set;
double radius = (double) w / (view_end -view_start);
double V1 = 6.220359, V2 = -13.874930;
if (merged_image) {
merged_image->init(w, h);
}
for (int i=0; i<MAX_PICS; i++) {
if (single_images[i]) {
single_images[i]->init(w, h);
}
}
for (int y=0; y<h; y++) {
double a_nick = atan((double)(y_off - y)/radius);
for (int x=0; x<w; x++) {
double a_view;
a_view = view_start + x * step_view;
merged_pixel_set = 0;
for (int i=0; i<MAX_PICS; i++) {
if (gipf[i] == NULL) {
break;
} else if (gipf[i]->get_pixel(m, a_view, a_nick,
&r, &g, &b) == 0) {
double l2 = (double) r + g + b;
double a2 = fabs(gipf[i]->get_angle_off(a_view, a_nick));
double devign = ( 1 + a2 * V1 + a2 * a2 * V2);
fprintf(stderr, "==> %lf\n", devign);
r = (uchar) MIN(rint((double) r * devign), 255);
g = (uchar) MIN(rint((double) g * devign), 255);
b = (uchar) MIN(rint((double) b * devign), 255);
if (single_images[i]) {
single_images[i]->set_pixel(x, r
, g, b);
}
if (!merged_pixel_set && merged_image) {
merged_image->set_pixel(x, r, g,
b);
merged_pixel_set++;
}
}
}
}
if (merged_image) {
merged_image->next_line();
}
for (int i=0; i<MAX_PICS; i++) {
if (single_images[i]) {
single_images[i]->next_line();
}
}
}
if (merged_image) {
merged_image->done();
}
for (int i=0; i<MAX_PICS; i++) {
if (single_images[i]) {
single_images[i]->done();
}
}
return 0;
}
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