MATLAB: I need matlab code for selecting video frames which are stored in a folder and one by one hide data in same way on each frame. Anyone can give code for this work??

dctsteganographyvideo processing

i use dct block for hiding.

Best Answer

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Related Solutions

MATLAB: Imagesc hide one axis

If you are using R2015b or later (I think it is) then,

ax = gca;
imagesc(YourImage, 'Parent', ax);
ax.YAxis.Visible = 'off';

MATLAB: How to sum up about 3-4 color frames and only show the brightest frame. Matlab

The below code assumes that the frames are RGB.

The below code does not attempt to detect intervals of flash and determine the best out of the interval: it takes the frames frames_per_group at a time and determines the brightest of that group.

obj = VideoReader('C:\Users\Robotics\Pictures\Saved Pictures\Lightfile\Prelight.MOV');
frameidx = 0;
frames_per_group = 5;
frame_history = [];
frameidx_history = [];
while hasFrame(obj)
    frameidx = frameidx + 1;
    groupidx = groupidx + 1;
    b = readFrame(obj);
    frame_history = cat(4, frame_history, b);
    frameidx_history(end+1) = frameidx;
    if size(frame_history, 4) == frames_per_group
      maxbrightness = -inf;
      maxbrightnessidx = -inf;
      for K = 1 : frame_per_group;
        grayframe = rgb2gray(frame_history(:,:,:,K));
        thisbrightness = sum(grayframe(:));
        if thisbrightness > maxbrightness
          maxbrightness = thisbrightness;
          maxbrightnessidx = K;
        end
      end
      bestframe = frame_history(:,:,:,maxbrightnessidx);
      bestframeidx = frameidx_history(maxbrightnessidx);
      filename = sprintf('frame%04d.jpg', bestframeidx);
      imwrite(bestframe, filename);
      frame_history = [];
      frameidx_history = [];
    end
end

(Code not tested)

Best Answer

Related Solutions

MATLAB: Imagesc hide one axis

MATLAB: How to sum up about 3-4 color frames and only show the brightest frame. Matlab

Related Question