How to fill rectangle with same color in image?

Hi,

I want to fill rectangle with same color such as bellow image. So, i recognition it to rectangle or square.

Please, let me know.

Thanks.

[Image Analyst]

I don't understand.

The image has TWO colors. Which do you want?

Or do you want the average color of the black and red (like a dark red)?

"I want to fill rectangle" Fill WHAT rectangle?

And what does "recognition it to rectangle or square" mean? You already said that it was a rectangle. Do you just want to see if the image height equals the image width, and it if is, declare, say with msgbox() or helpdlg(), that the image is square?

Read this link and then clarify if you still need more help, because we're totally confused.

Answer 1

[KSSV]

I = imread('target1.png') ;
I1 = rgb2gray(I) ;

[y,x] = find(I1) ;
R = I(:,:,1) ; G = I(:,:,2) ; B = I(:,:,3) ;

x0 = min(x) ; x1 = max(x) ; 
y0 = min(y) ; y1 = max(y) ;

[X,Y] = meshgrid(x0:x1,y0:y1) ;

idx = sub2ind(size(I1),Y(:),X(:)) ;
I2 = I ;
C = [mean(R(idx)) mean(G(idx)) mean(B(idx))] ;
for i = 1:3
    T2 = I2(:,:,i) ;
    T2(idx) = C(i) ;
    I2(:,:,i) = T2 ;
end
imshow(I2)

[Junwon Park]

Thanks, KSSV.