hi, i am having problem while iterating a 5x5 window over a mat image. it iterates along column but it crashes when new row comes. what should i do. i am doing this to find local standard deviation.
here is the code:-
Mat block;
Mat inner = cv::imread("C:\\Users\\Intern-3\\Desktop\\processed\\edited.png",0);
int row = inner.rows; int col = inner.cols;
cv::imshow("Original Image", inner); // show the image
imwrite( "C:\\Users\\Intern-3\\Desktop\\processed\\original.jpg", inner );
cerr << inner.rows << endl;
cerr << inner.cols << endl;
row--;
col--;
cout<<"RowsLast = "<<endl<<" "<<inner.col(col)<<endl;
cout<<"-------------------\n"<<endl;
Mat outer = Mat(inner.rows+2, inner.cols+2, inner.type());
copyMakeBorder(inner,outer ,1,1,1,1,BORDER_REPLICATE);
row = outer.rows;
col=outer.cols;
cerr << outer.rows << endl;
cerr << outer.cols << endl;
cv::imshow("Processed Image", outer); // show the image
imwrite( "C:\\Users\\Intern-3\\Desktop\\processed\\processed.jpg", outer );
col--;
cout<<"RowsLast = "<<endl<<" "<<outer.col(col)<<endl;
cout<<"-------------------\n"<<endl;
block = (outer(Rect(0,0,4,4)));
for(int i=2;i<row+2;i++)
{
for(int j=2;j<col+2;j++)
{
int sum1=0;
int sum2=0;
block = outer.rowRange(i-2,i+2).colRange(j-2,j+2);
for(int x=0;x<5;x++)
{
for(int y=0;5<5;y++)
{
sum1=sum1+ block.at<uchar>(x, y); // Addition of all elements
sum2=sum2+block.at<uchar>(x,y)*block.at<uchar>(x,y); //Addition of all element square
cout<<"Y = "<<y<<endl;
}
}
double mean = sum1/25;
double variance=-(mean*mean -(sum2/25)); //Variance
double deviation=sqrt(variance); //Standard deviation
//Storing deviation value at pixel position in output image
block.at<uchar>(i-2,j-2)=deviation;
}
}
waitKey(0);
}