I m trying to implement Edge Histogram Descriptor. How can I create 5-bin histogram of directional edges in a sub-image of an image.

 for row=1:blockSizeR:rows
     for col=1:blockSizeC:columns
         row1=row;
         row2=row1+blockSizeR-1;
         row2=min(rows,row2);

         col1=col;
         col2=col1+blockSizeC-1;
         col2=min(columns,col2);
         K=RS(row1:row2,col1:col2);

        store1(i,j)={K}; %storing values of each block of image into a cell array A.
      if j<=3 && i<=4
          j=j+1;
      else
          i=i+1;
          j=1;
      end

      figure(1),subplot(4,4,blockNumber),imshow(K);%showing result of 4x4 matrix of subimages
       blockNumber=blockNumber+1;

Answer 1

[Image Analyst]

What's the purpose of storing all the (badly-named) K? Why?

Also, I don't see any histogram line, like

[counts, grayLevels] = imhist(K);

Also I don't see any edge detection in your code either. Why not? Are you trying to do HOG (Histogram of Gradients)?