How to fill rectangle with same color in image?

Question

Junwon Park 2018-6-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/405814-how-to-fill-rectangle-with-same-color-in-image

评论： Image Analyst 2018-6-18

采纳的回答： KSSV

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.

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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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Answer 1

KSSV 2018-6-15

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/405814-how-to-fill-rectangle-with-same-color-in-image#answer_324806

编辑：KSSV 2018-6-15

在 MATLAB Online 中打开

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)