MATLAB: How to write matlab porgramme to remove one of the RGB channels (make 0) in each of the 10 frames in a sequence

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how to write matlab programme to remove one of the RGB channels in each of the 10 frames in a sequence

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frame_to_remove = randi(3);
initialize
for framenum = 1 : 10
  advance to frame given by framenum, storing in variable thisframe
  thisframe(:,:,frame_to_remove) = 0;
  image(thisframe);
  drawnow();
end

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MATLAB: How to determine RGB values for a single column of an image

Before the loop, you preallocate your R, G, and B arrays

redColumn600s = zeros(vidHeight, numberOfFrames, 'uint8');
greenColumn600s = zeros(vidHeight, numberOfFrames, 'uint8');
blueColumn600s = zeros(vidHeight, numberOfFrames, 'uint8');

You get your single frame from this:

thisFrame = read(videoObject, frame);

so now you need to extract column 600. To get the 3 colors separately, you'd do this:

column600R = thisFrame(:, 600, 1); % Extract red channel column 600.
column600G = thisFrame(:, 600, 2); % Extract green channel column 600.
column600B = thisFrame(:, 600, 3); % Extract blue channel column 600.

Then stuff those into your cumulative arrays

redColumn600s(:, frame) = column600R;
greenColumn600s(:, frame) = column600G;
blueColumn600s(:, frame) = column600B;

(You could combine the last two code chunks if you want to eliminate the temporary vector variables.)

MATLAB: How to construct a video from frames

Just change your for loop to start with the frame you want to begin with:

for frame = beginningFrameNumber : numberOfFrames

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Related Solutions

MATLAB: How to determine RGB values for a single column of an image

MATLAB: How to construct a video from frames

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