Can System Objects be used with webcam video acquisition for live video

John Michell answered . 2024-12-20 18:48:10

• There is a large amount of buffering when using this mechanism.
• The video stream is compressed.

% Demo code below:
% -----------
%% Initialization
hCamera = videoinput('winvideo',1);
triggerconfig(hCamera, 'manual');
%
hSingle = video.ImageDataTypeConverter;
hCSC = video.ColorSpaceConverter('Conversion', 'YCbCr to RGB');
hOF = video.OpticalFlow('OutputValue', 'Horizontal and vertical components in complex form', ...
    'ReferenceFrameDelay', 1);
hMean1 = video.Mean;
hMean2 = video.Mean('RunningMean', true);
hMedianFilt = video.MedianFilter2D;
hClose = video.MorphologicalClose('Neighborhood', strel('line',5,45));
hErode = video.MorphologicalErode('Neighborhood', strel('square',2));
hVideo1 = video.VideoPlayer('WindowCaption', 'Original Video');
hVideo1.WindowPosition = [50 250 350 300];
hVideo2 = video.VideoPlayer('WindowCaption', 'Results');
hVideo2.WindowPosition = [475 250 350 300];
%%
i=0;
start(hCamera)
while i < 150          % A hack to limit the demo to 150 frames
    image = getsnapshot(hCamera);
    I = step(hSingle,image);
    Irgb = step(hCSC, I);
    of = step(hOF, I(:,:,1));
    of_mag = of .* conj(of);
    vel_th = 0.50 * step(hMean2, step(hMean1, of_mag));
    filteredout = step(hMedianFilt, of_mag >= vel_th);
    th_image = step(hClose, step(hErode, filteredout));
    step(hVideo1, Irgb); % Display Original Video
    step(hVideo2, th_image); % Display Moving Objects
    i = i+ 1;
end
%%
stop(hCamera);
%%
close('all','force');

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