highlight a sliding window on image

Hi I have a sliding window on my image. If the pixels within a sliding window meet certain conditions then I need to higlight this window on the image so that it can be seen were the suspicious pixels are.

I have tried the following but the window is apprearing in the wrong position. Can anyone help me please:

    if average>200
             N2=8;
             info2 = repmat(struct, ceil(size(Z, 1) / N2), ceil(size(Z, 2) / N2)); 
             for row1 = 1:N2:size(Z, 1)%loop through each pixel in the 8x8 window
                 for col1 = 1:N2:size(Z, 2)
                     x = (row1 - 1) / N2 + 1;
                     y = (col1 - 1) / N2 + 1;

                     imgWindow2 = Z(row1:min(end,row1+N2-1), col1:min(end,col1+N2-1));
                     average2 = mean(imgWindow2(:)); 
                     window2(x,y).average=average2;

                    % if the intensity of the 8x8 window is greater than
                    % 210 then considered suspicious- calculate GLCM-
                     if average2>210

                        offsets0 = [0 1];%-1 1; -1 0; -1 -1]; 
                        glcms = graycomatrix(imgWindow2,'Offset',offsets0);
                        stats = graycoprops(glcms,'all'); 

                        correlation=[stats.Correlation];  
                        contrast=[stats.Contrast];
                        homogeneity=[stats.Homogeneity];
                        energy=[stats.Energy];

                        %if these conditions are met then this window
                        %contains an ROI
                        if (homogeneity > 0.9)
                             if  (contrast<0.2)
                                 if (energy>0.6)

                                  % display('there is mass ')%use for testing 

                                   end 
                                 end
                             end

                    end % end if>210

                end %end for col1
            end %end for row1
        end %end if average>200
     end% end for col
 end %end for row

Z1  = insertShape(Z, 'rectangle', [x y 8 8]);
figure(2);      
imshow(Z1);

Answer 1

[Image Analyst]

Try using plot() to plot the corners of a rectangle - use 5 vertices so the box is closed, and put "drawnow" after you call plot so you'll see it.