MATLAB: Storing an image

image processing

I have taken a video converted in number of frames and created a folder named NEW ,

 nframes is 40

for k = 1:nFrames

…………….. ……………..

end

please tell how to write imaged into NEW folder in that for loop

Best Answer

obj = mmreader('yourvideofile.avi');
vid = read(obj);
nFrame = 5;
for k = 1 : nFrame
    newname = strcat('frame0',num2str(k),'.jpg');
    imwrite(vid(:,:,:,k), newname);  
end

Related Solutions

MATLAB: How to save image of a video.avi file into the folder where Matlab is running as image.bmp file

Hi,

'shaky_car.avi' is already exist in visiondemos folder,

so you do not need to change the directory by

cd 'C:\Program Files\MATLAB\R2011a\toolbox\vision\visiondemos';

Just try my code and I hope this works on your machine.

    obj = mmreader('shaky_car.avi');
    vid = read(obj);
    nFrame = size(vid,4);  
    for k = 1 : nFrame
        newname = strcat(num2str(k),'.bmp');
        imwrite(vid(:,:,:,k), newname);  
    end

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 image of a video.avi file into the folder where Matlab is running as image.bmp file

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

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