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//Algorithme
void algo_approx(IplImage* im,IplImage* blur_image,double sigma1)
{
IplImage* buffer=cvCreateImage(cvSize(im->width,im->height), IPL_DEPTH_32F,1);
cvCopy(im,buffer);
int N_iteration =6;
int m_itération_inf;
float W=sqrt(sigma1*sigma1*12/N_iteration+1);
int wl = floor(W);
if(!(wl%2))wl-=1;
int wu = wl+2;
m_itération_inf=(12*sigma1*sigma1-N_iteration*wl*wl-4*wl*N_iteration-3*N_iteration)/(-4*wl-4);
int i;
for(i=0;i<m_itération_inf;i++)
{
filtre_moyenne(buffer,blur_image,wu);
cvCopy(blur_image,buffer);
}
int end= N_iteration-m_itération_inf;
for(i=0;i<end;i++)
{
filtre_moyenne(buffer,blur_image,wu);
cvCopy(blur_image,buffer);
}
cvReleaseImage(&buffer);
}
//utilisation de la méthode par image intégrale
void filtre_moyenne(IplImage* im,IplImage *buffer,int W)//W impaire !!
{
int border = (W-1)/2.0;
IplImage* im_border;
im_border = cvCreateImage(cvSize(im->width+(W-1),im->height+(W-1)), IPL_DEPTH_32F, 1);
cvCopyMakeBorder(im,im_border, cvPoint(border,border), IPL_BORDER_REPLICATE);
IplImage* integral=cvCreateImage(cvGetSize(im_border), IPL_DEPTH_32F, 1);
Integral(im_border,integral);
cvZero(buffer);
float * F_ptr_A;
float * F_ptr_B;
float * F_ptr_C;
float * F_ptr_D;
float * F_ptrL;
float A,B,C,D;
float S=0.0f;
for (int y = 0; y < buffer->height; y++) //mettre les pointeurs dans la boucle
{
F_ptr_A = (float *) (integral->imageData + (integral->widthStep*y));
F_ptr_B = (float *) (integral->imageData + (integral->widthStep*(y+W-1)));
F_ptr_C = (float *) (integral->imageData + (integral->widthStep*y));
F_ptr_C+=W-1;
F_ptr_D = (float *) (integral->imageData + (integral->widthStep*(y+W-1)));
F_ptr_D+=W-1;
F_ptrL= (float *) (buffer->imageData+ buffer->widthStep*y);
for (int x = 0; x < buffer->width; x++)
{
A= (*F_ptr_A);
B= (*F_ptr_B);
C= (*F_ptr_C);
D= (*F_ptr_D);
S=A+D-B-C;
F_ptr_A++;
F_ptr_B++;
F_ptr_C++;
F_ptr_D++;
*F_ptrL =S/(W*W);
F_ptrL++;
}
}
cvReleaseImage(&integral);
cvReleaseImage(&im_border);
}
//calcul de l'image intégrale
void Integral(IplImage *img,IplImage *integral)
{
// image : single channel 32f
// set up variables for data access
int height = img->height;
int width = img->width;
int step = img->widthStep/sizeof(float);
float *data = (float *) img->imageData;
float *i_data = (float *) integral->imageData;
// first row only
float rs = 0.0f;
for(int j=0; j<width; j++)
{
rs += data[j];
i_data[j] = rs;
}
// remaining cells are sum above and to the left
for(int i=1; i<height; ++i) //utilisation de pointeurs
{
rs = 0.0f;
for(int j=0; j<width; ++j)
{
rs += data[i*step+j];
i_data[i*step+j] = rs + i_data[(i-1)*step+j];
}
}
} |
