Find summation of white pixel of detected rectangle from a binary iamge??

im=imread('8.jpg');  %read above picture
im=im2bw(im,.555);
[row,col]=size(im);
area=(row*col)*.1;
stats = regionprops(im);
imshow(im);
hold on;

density=0;
for i = 1:numel(stats)
rect = [stats(i).BoundingBox];
count = 0;
if(rect(3)*rect(4)>area)
for j=  fix(rect(1)):fix(rect(3))+fix(rect(1))% for every pixel of detected rectangle         
    for k= fix(rect(2)):fix(rect(4))+fix(rect(2))
        if((j<=row && j>0 && k<=col && k>0)&&(im(j,k)== 1))    %count white pixel
         count =count +1;
        end
    end
end
density=count/fix(rect(3))*fix(rect(4)); %count sum of white pixel/area
disp(count);
disp(density);

textRect =i;
rectangle('Position', stats(textRect).BoundingBox, ...
'Linewidth', 1, 'EdgeColor', 'r', 'LineStyle', '--');
f = getframe(gca);
im = frame2im(f);
imwrite(im,'8_rect.tif');
 end
end

But i didnt get the appropriate value of the density of that detected area,it should be <1.

Can any one please help me to find out the pixel density of that detected rectangle??

Thank You in Advance.

Answer 1

[Rajat]

There are lot of image like in SignBoard,Advertisement,Book which contain text and I want to classify the category of those image,so initially I classify based on detected rectangle and its pixel density.If you have any better idea please suggest me.