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The processing on the GPU give me wrong result and noise(not randomly). This is my code :

Mat ker(3,3,CV_8S);

// gain=0 ker.at<char>(0,0)=-(1+gain),ker.at<char>(0,1)=-(1+gain),ker.at<char>(0,2)=-(1+gain); ker.at<char>(1,0)=-(1+gain),ker.at<char>(1,1)=(1+gain)8,ker.at<char>(1,2)=-(1+gain); ker.at<char>(2,0)=-(1+gain),ker.at<char>(2,1)=-(1+gain),ker.at<char>(2,2)=-(1+gain); Mat test(taille,taille,CV_8UC1,125); for(int x=0;x<taille;x++) {="" for(int="" y="0;y&lt;taille;y++)" {="" test.at<uchar="">(y,x)=((x%2)^(y%2))255; //corect test.at<uchar>(y,x)=x+y; } } Mat res; Mat temp; test.copyTo((temp,test)); GpuMat resgpu(test);

test.copyTo(res,test);
filter2D(res,res,res.depth(),ker);
filter2D(resgpu,resgpu,resgpu.depth(),ker);

vector<int> compression_params; compression_params.push_back(CV_IMWRITE_JPEG_QUALITY ); compression_params.push_back(100);

imwrite("aze.jpg",test,compression_params);
imwrite("aze_filtre.jpg",res,compression_params);
imwrite("aze_filtre_gpu.jpg",Mat(resgpu),compression_params);

// correct:cpu: :

//wrong:gpu:

The processing on the GPU give me wrong result and noise(not randomly). This is my code :

Mat ker(3,3,CV_8S);

// gain=0 ker.at<char>(0,0)=-(1+gain),ker.at<char>(0,1)=-(1+gain),ker.at<char>(0,2)=-(1+gain); ker.at<char>(1,0)=-(1+gain),ker.at<char>(1,1)=(1+gain)8,ker.at<char>(1,2)=-(1+gain); ker.at<char>(1,0)=-(1+gain),ker.at<char>(1,1)=(1+gain)*8,ker.at<char>(1,2)=-(1+gain); ker.at<char>(2,0)=-(1+gain),ker.at<char>(2,1)=-(1+gain),ker.at<char>(2,2)=-(1+gain); Mat test(taille,taille,CV_8UC1,125); for(int x=0;x<taille;x++) { for(int x=0;x<taille;x++) {="" for(int="" y="0;y&lt;taille;y++)" {="" test.at<uchar="">(y,x)=((x%2)^(y%2))255; //corect y=0;y<taille;y++) { // test.at<uchar>(y,x)=((x%2)^(y%2))*255; //corect test.at<uchar>(y,x)=x+y; } } Mat res; Mat temp; test.copyTo((temp,test)); GpuMat resgpu(test);

test.copyTo(res,test);
filter2D(res,res,res.depth(),ker);
filter2D(resgpu,resgpu,resgpu.depth(),ker);

imwrite("aze.jpg",test,compression_params);
imwrite("aze_filtre.jpg",res,compression_params);
imwrite("aze_filtre_gpu.jpg",Mat(resgpu),compression_params);