image processing - Error using IDCT (OpenCV) -


everytime run code program don't respond , msg , don't know problem ? can me ?

message:enter image description here

my code:

int main(){ mat image,dctimage; image=imread("2.jpg"); cvtcolor(image,image,cv_bgr2gray); image.convertto(image,cv_32fc1); mat freq; dct(image,freq);  imwrite("dctimage.jpg",freq);  int start;int col=0;int rows=0; stringstream ss;  for(start=100;start>0;start=start-1){     for(int x=start;x<freq.rows;x++){         for(int y=start;y<freq.cols;y++){             freq.at<double>(x,y)=0.0;         }     } mat dst(freq.size(),freq.type()); idct(freq,dst); ss<<start<<".jpg"; cout<<ss.str()<<endl; imwrite(ss.str(),dst); ss.str(""); cout<<ss.str()<<endl;  }

try change freq.at<double>(x,y)=0.0; freq.at<float>(x,y)=0.0; because feed image.convertto(image,cv_32fc1); , should expect same element type.


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