MATLAB: How to convert captured frames from webcam into avi format with 20fps.

image acquisition toolimage processingImage Processing Toolboxvideo processing

I've tried a lot of things but got some error in anyway. Can you please guide me through?

Best Answer

Well you stated that you've tried a lot of things, but you didn't provide any code with it so that's not really helpfull. I suggest taking a look at how to acquire images from your webcam and after that it should not be that hard to create a video using VideoWriter. Hint: create a for-loop/while statement to continuously capture images from your webcam.

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MATLAB: Image acquisition, frame rgb2gray conversion

The rgb2gray function only works on a single image, but you are sending it an array of images.

What is the format that you ultimately need the data in? It looks like your camera is returning YUV data, but you're converting it to RGB data and then attempting to convert it to monochrome data. If you're converting to RGB data just to display one frame in the imshow command, I would leave the data as YUV, i.e. don't set the ReturnedColorSpaceProperty, and convert the frame that you want to display to RGB:

   imshow( ycbcr2rgb( frames(:,:,:,1))).

The first band of the YUV data is the luminance band, so you should be able to use that directly as your monochrome data:

   Sgray = frames(:,:,1,:);

The command to write a frame as jpeg (as well as many other formats) is imwrite.

MATLAB: How to store acquired data of multiple frames from webcam to local storage with any name

You should decide "what" and "how" do you want to store. You can't store five snapshots in one *.png image. You can store this data (your workspace variables) in *.mat (better choice) format https://www.mathworks.com/help/matlab/ref/save.html, or save it as a five different *.png images.

p.s. In your code there are some mistakes! if you wouldlike to save five snapshots from webcam to a different png files you should use this code

wblist = webcamlist;

cam = webcam(wblist{1})

for i=1:5

filename = sprintf('myimage%02d.png', i);

imwrite(snapshot(cam),filename);

end

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MATLAB: Image acquisition, frame rgb2gray conversion

MATLAB: How to store acquired data of multiple frames from webcam to local storage with any name

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