MATLAB: How to change color space of any video

video color space changing

how to change color space of any video, e.g video in rgb color space is converting into hsv or gray?

Best Answer

vidObj = VideoReader('C:\Users\Public\Videos\Sample Videos\Wildlife.wmv');  % video file 
%% Read the video frame by frame 
numFrames = 0;
iwant = cell([],1) ; 
while hasFrame(vidObj)
    F = readFrame(vidObj);    
    numFrames = numFrames + 1;   
    imagesc(F)
    drawnow
    iwant{numFrames} = F ;
end
%% Write to video
v = VideoWriter('myFile','Archival');
v.VideoCompressionMethod
open(v)
for i = 1:numFrames
    writeVideo(v,rgb2gray(iwant{i}))
end
close(v)

Related Solutions

MATLAB: How to save the frames of a video into a cell array

vidObj = VideoReader('C:\Users\Public\Videos\Sample Videos\Wildlife.wmv');
numFrames = 0;
iwant = cell([],1) ;
while hasFrame(vidObj)
    F = readFrame(vidObj);    
    numFrames = numFrames + 1;
    iwant{numFrames} = F ;
    imagesc(F)
    drawnow
end
numFrames

MATLAB: I keep trying to convert a video grayscale but it gives me an error

Instead of rgb2gray(), use read() and pass it the frame number. Should look something like this:

% Loop through the movie, writing all frames out.
for frame = 1 : numberOfFrames
	% Extract the frame from the movie structure.
	thisInputFrame = read(inputVideoReaderObject, frame);
	
	% Display it
	image(thisInputFrame);
        if ndims(thisInputFrame) == 3
            thisInputFrame = rgb2gray(thisInputFrame);
        end
	axis on;
	axis image;
	caption = sprintf('Frame %4d of %d.', frame, numberOfFrames);
	title(caption, 'FontSize', fontSize);
	drawnow; % Force it to refresh the window.
	
	% Resize the image.
	outputFrame = imresize(thisInputFrame, [outputVideoRows, outputVideoColumns]);
	
	% Write this new, resized frame out to the new video file.
	writeVideo(outputVideoWriterObject, outputFrame);
	
	% Update user with the progress.  Display in the command window.
	progressIndication = sprintf('Processed frame %4d of %d.', frame, numberOfFrames);
	disp(progressIndication);
	% Increment frame count (should eventually = numberOfFrames
	% unless an error happens).
	numberOfFramesWritten = numberOfFramesWritten + 1;
end

Best Answer

Related Solutions

MATLAB: How to save the frames of a video into a cell array

MATLAB: I keep trying to convert a video grayscale but it gives me an error

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