After extraction of frames from a video how to embed and extract an image in that video?

I am doing a major project on Video watermarking.Please help me with the matlab code.I am a new learner of matlab. It would be very kind of you , if you kindly help me with the video watermarking matlab code.

Answer 1

[Image Analyst]

Why don't you just do a weighted average of your watermark with your original frames, and write out the averaged frames?

[Madhurima Das]

Thank you so much for your answer.But Sir, I've tried doing this but i wasn't successful. It would be really nice if you kindly help me with this concept of yours.

Thanking you,

Madhurima

[Image Analyst]

For each frame, do this:

% Extract the individual red, green, and blue color channels.
rgbImage = read(frameNumber);
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
redWM = uint8(0.8 * single(redChannel) + 0.2 * single(watermarkImage));
greenWM = uint8(0.8 * single(greenChannel) + 0.2 * single(watermarkImage));
blueWM = uint8(0.8 * single(blueChannel) + 0.2 * single(watermarkImage));
% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

Now use

yourMovie(frameNumber) = im2frame(rgbImage);

Go here for a more complete example:

http://www.mathworks.com/matlabcentral/answers/48797#answer_59652

[Madhurima Das]

Thank you so much for your response. I am extremely grateful to you. Sir,I've worked upon image watermarking using spread spectrum.The code of mine for image watermarking using spread spectrum is working perfectly(embedding as well as extraction process). Now, I would like to implement the same for a video like 'rhino.avi' using spread spectrum(embedding and extraction process both). It would be very kind of you,if you kindly help me with this.

Thanking you,

Madhurima

[Pritish]

what is watermarkImage?

[Walter Roberson]

http://en.wikipedia.org/wiki/Digital_watermarking

[Madhurima Das]

Sir,as suggested by you i tried implementing the weighted average of my watermark with the original frames,and then writing out the averaged frames....I have used your coding,but there is an error occuring with the read function.I would like to know the alternative for the read function for your code.Sir please help me out,i need to implement embedding and extraction of an image into the frames of the video.

[Madhurima Das]

There is also an error occurring saying matrix dimensions must agree for the watermarkImage variable...Sir,Please help me out.I am looking forward to your help.

[Image Analyst]

You have to add the same size matrices together. If your cover image is larger than your watermark, then crop out the desired chunk of your cover image, average them, then assign it back to your cover image.