Embedding visible watermark in color document.
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Balkar Singh
el 16 de Feb. de 2021
Comentada: Balkar Singh
el 25 de Mzo. de 2021
I want to embed a visible watermark in a color document image in the blank space (black rectangle as shown in image) as shown in the attached image. I'll be very thankful to you.
With regards
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Shravan Kumar Vankaramoni
el 23 de Mzo. de 2021
Editada: Shravan Kumar Vankaramoni
el 23 de Mzo. de 2021
Hi Balkar Singh,
Alpha blending method is used to watermark an image here
Watermarked_Image = Original_Image *alpha + (1-alpha)*watermark
Where alpha is the transparency parameter.
The following code demostrates this,
watermark = imread('saturn.png');
%Resize the watermark according to the area
modified = imresize(watermark,[64,64],'bilinear');
disp(size(modified));
original_image = imread('Marksheet1.png');
temp = zeros(size(original_image),'uint8');
[rows, cols, depth] = size(modified);
%Co-ordinnates to place the watermark
X = 21;
Y = 441;
temp(X:X+rows-1,Y:Y+cols-1,:) = modified;
temp(301:364,101:164,:) = modified;
temp(301:364,401:464,:) = modified;
alpha = 0.8;
watermarked_image = alpha * original_image + (1-alpha)*temp;
imshow(watermarked_image);
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