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i think this two parts of code is independent to each of them.

CvMat *itgMap = cvCreateMat(gray->height + 1,gray->width + 1,CV_32SC1);

for(int> y=0;y<itgmap->height;y++)

for(int> x=0;x<itgmap->width;x++) {>

double pvalue = cvGet2D(gray,y-1,x-1).val[0]; // part1

double itg = cvGet2D(itgMap,y,x-1).val[0]; // part2

....... it makes segmentation fault error

but

for(int y=0;y<itgmap->height;y++)

for(int x=0;x<itgmap->width;x++) {

    double pvalue =  cvGet2D(gray,y-1,x-1).val[0];

this works ok .. and

for(int y=0;y<itgmap->height;y++)

for(int x=0;x<itgmap->width;x++) {

   double itg = cvGet2D(itgMap,y,x-1).val[0];

and it works well too..

only when both codes are enabled at same time, it makes segmentation faults but I can't see any relation of them.. how is it possible?