This code isn't working. How do I change the datatype of the image B such that it is also 128*128, the error is :

Error using .* Matrix dimensions must agree.

Error in fy (line 33) circle_image = double(B).* circleMat;

   A=imread('search.jpg');
  figure,imshow(A); title('Original Image');
  %Convert the Image to binary
  B=im2bw(A);

%Fill the holes
C=imfill(B,'holes');

%Label the connected components
[Label,Total]=bwlabel(C,8);
%Rectangle containing the region
Sdata=regionprops(Label,'BoundingBox');

%Crop all the objects 
for i=1:1%Total
    Img=imcrop(A,Sdata(i).BoundingBox);
    Name=strcat('Object Number:',num2str(i));
    imwrite(Img,'i.jpg');
    B=padarray(Img,[10 10]);
    B=imresize(B,[128 128]);
    figure,imshow(B); title(Name);
end
 rows = 128;
cols = 128;
radius=64;
center = [64 64];

for radius=1:64
 [xMat,yMat] = meshgrid(1:cols,1:rows);
 distFromCenter = sqrt((xMat-center(1)).^2 + (yMat-center(2)).^2);
 circleMat = distFromCenter<=radius;
 circle_image = double(B).* circleMat;
 ne(radius) = length(find(circle_image > 0))
end

It shows that the dimensions of B are 128*128*3uint8 and that of circleMat is 128*128 logical.

Answer 1

[Walter Roberson]

At that point, B is something that has been cropped out of the color image A and resized.

Your code tries to count nonzero pixels within a range of radii. You need to decide whether for color images whether you want to count the pixels for which at least one pixel is nonzero, or if you want to count pixels for which all of the components are are nonzero.

I suggest that when you assign to B, you use

B=double(any(B, 3));