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| #include "cv.h"
#include "highgui.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <float.h>
#include <limits.h>
#include <time.h>
#include <ctype.h>
double *mygetPerspectiveTransform(CvPoint2D32f P1, CvPoint2D32f P2, CvPoint2D32f P3, CvPoint2D32f P4){
double *H;
H = new double [18];
double *adj=H+9;
double sx = (P1.x-P2.x)+(P3.x-P4.x);
double sy = (P1.y-P2.y)+(P3.y-P4.y);
double dx1 = P2.x-P3.x;
double dx2 = P4.x-P3.x;
double dy1 = P2.y-P3.y;
double dy2 = P4.y-P3.y;
double z = (dx1*dy2)-(dy1*dx2);
double g = ((sx*dy2)-(sy*dx2))/z;
double h = ((sy*dx1)-(sx*dy1))/z;
// matrice de transformation
double a=H[0]=P2.x-P1.x+g*P2.x;
double b=H[1]=P4.x-P1.x+h*P4.x;
double c=H[2]=P1.x;
double d=H[3]=P2.y-P1.y+g*P2.y;
double e=H[4]=P4.y-P1.y+h*P4.y;
double f=H[5]=P1.y;
H[6]=g;
H[7]=h;
H[8]=1;
// matrice de transformation inverse (matrice adjointe)
adj[0]=e-f*h;
adj[1]=c*h-b;
adj[2]=b*f-c*e;
adj[3]=f*g-d;
adj[4]=a-c*g;
adj[5]=c*d-a*f;
adj[6]=d*h-e*g;
adj[7]=b*g-a*h;
adj[8]=a*e-b*d;
return H;
}
double * invert(double u, double v, double* system) {
double *H;
H = new double [2];
H[0] = (system[0]*u+system[1]*v+system[2])/(system[6]*u+system[7]*v+1);
H[1] = (system[3]*u+system[4]*v+system[5])/(system[6]*u+system[7]*v+1);
return H;
}
int main(int argc, char* argv[]){
IplImage* image_src = cvLoadImage(argv[1],1);
IplImage* image_dst = cvCreateImage( cvGetSize(image_src), 8, 1 );
CvPoint2D32f P1, P2, P3, P4;
P1.x = 449.549;
P1.y = 362.789;
P2.x = 591.633;
P2.y = 374.233;
P3.x = 588.618;
P3.y = 60.3181;
P4.x = 513.554;
P4.y = 53.2928;
printf("P1.x = %f\n",P1.x);
printf("P1.y = %f\n",P1.y);
printf("P2.x = %f\n",P2.x);
printf("P2.y = %f\n",P2.y);
printf("P3.x = %f\n",P3.x);
printf("P3.y = %f\n",P3.y);
printf("P4.x = %f\n",P4.x);
printf("P4.y = %f\n",P4.y);
CvPoint2D32f P1T, P2T, P3T, P4T;
P1T.x = 400.0;
P1T.y = 253.0;
P2T.x = 660.0;
P2T.y = 253.0;
P3T.x = 510.0;
P3T.y = 106.0;
P4T.x = 555.0;
P4T.y = 106.0;
cvCircle( image_src, cvPointFrom32f(P1T), 9, CV_RGB(0,0,255), 3); //bleu
cvCircle( image_src, cvPointFrom32f(P2T), 9, CV_RGB(0,255,0), 3); //vert
cvCircle( image_src, cvPointFrom32f(P3T), 9, CV_RGB(255,0,0), 3); // rouge
cvCircle( image_src, cvPointFrom32f(P4T), 9, CV_RGB(255,255,0), 3); // jaune
double* system = mygetPerspectiveTransform(P1T,P2T,P3T,P4T);
printf("system[0] : %g\n",system[0]);
printf("system[1] : %g\n",system[1]);
printf("system[2] : %g\n",system[2]);
printf("system[3] : %g\n",system[3]);
printf("system[4] : %g\n",system[4]);
printf("system[5] : %g\n",system[5]);
printf("system[6] : %g\n",system[6]);
printf("system[7] : %g\n",system[7]);
double width=image_src->width;
double height=image_src->height;
// pour chaque pixel de l'image cible
for(int y=0 ; y<image_src->width ; y++) {
for(int x=0; x < image_src->height;x++) {
// conversion dans le repère orthonormé (u,v) [0,1]x[0,1]
double u = (double)x/width;
double v = (double)y/height;
double* P = invert(u,v,system);
int sx=(int)round(P[0]);
int sy=(int)round(P[1]);
//printf("SY = %d - SX = %d Y = %d - X = %d \n",sy,sx,y,x);
// pixel source
if(sy < image_src->width && sy >= 0 && sx < image_src->height && sx >= 0){
// on évite que le get cherche un pixel qui est en dehors de l'image
CvScalar rgb=cvGet2D(image_src,sx,sy);
int dx=x;
int dy=y;
cvSet2D(image_dst,dx,dy,rgb);
}
}
}
cvNamedWindow("Source Image", 1 );
cvNamedWindow("Destination Image", 1 );
cvShowImage( "Source Image", image_src );
cvShowImage( "Destination Image",image_dst );
cvWaitKey();
return 0;
} |
