how to embed a watermark in a color image

Question

shafaq innam 2013-4-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71950-how-to-embed-a-watermark-in-a-color-image

回答： cui,xingxing 2021-9-13

i=imread('golf.jpg'); imshow(i); j=rgb2gray(i); imshow(j); n=imread('copy.jpg'); l=imresize(n,0.5); m=rgb2gray(l); imshow(m); [r,c]=size(j); startrow=1; startcol=1; j(startrow:startrow+size(m,1)-1,startcol:startcol+size(m,2)-1) = m; imshow(j); i used this code for watermarking a grayscale image and i can embed the watermark anywhere by replacing the values but it doesnot work for color images how can i watermark a color image?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2013-4-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71950-how-to-embed-a-watermark-in-a-color-image#answer_82175

在 MATLAB Online 中打开

You can do that same thing in every color channel.

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Now put in watermark, then recombine  
newRGBImage = cat(3,watermarkedRed, watermarkedGreen, watermarkedBlue);

4 个评论
显示 2更早的评论隐藏 2更早的评论

SUBROTO KUNDU 2019-7-24

Hi Image Analyst,

I have tried several times to write the code. But it does not give the correct output. Please help me.

https://www.mathworks.com/matlabcentral/answers/473297-reversible-watermarking-based-on-binomial-transform-and-cholesky-decomposition

Image Analyst 2019-7-26

But you didn't answer my two questions. And I'd have to research it just like you would, but since it's your project, not mine, and it will probably take more than about 5 minutes, I can't afford to donate that much time to you. Sorry. I'm sure you'd do just as good a job of delving into the intricate details as I could.

请先登录，再进行评论。