How to fill rectangle with same color in image?

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Junwon Park
Junwon Park 2018-6-15
评论： Image Analyst 2018-6-18
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.
  1 个评论
Image Analyst
Image Analyst 2018-6-18
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.

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采纳的回答

KSSV
KSSV 2018-6-15
编辑：KSSV 2018-6-15
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)

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