Can vision.ForegroundDetector work on GUI
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Hi, Can I use GUI to display foreground from vision.ForegroundDetector? By using the same method I can extract the foreground. But in the GUI I can't display the foreground. Please help, thanks
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Accepted Answer
Leona Chan
on 15 Aug 2017
6 Comments
Jiro Doke
on 15 Aug 2017
"Same method" as in using foregroundDetector in a loop with video frames?
I can't say for certain, but you may need to take the vision.ForegroundDetector initialization outside of the "loop". If I remember correctly, the detector uses past frames to estimate the background. Currently, in your snippet of code, you are recreating the detector for each frame, thus clearing the past frames from its algorithm. Just using your code snippet, you may need to change to something like this.
function playCallback(hObject,~,videoSrc,hAxes)
foregroundDetector = vision.ForegroundDetector('NumGaussians', 4, ...
'NumTrainingFrames', 60);
while strcmp(hObject.String, 'Pause') && ~isDone(videoSrc)
[frame,result] = getAndProcessFrame(videoSrc,foregroundDetector);
showFrameOnAxis(hAxes.axis1, frame);
showFrameOnAxis(hAxes.axis2, result);
end
end
function [frame,foreground] = getAndProcessFrame(videoSrc,foregroundDetector)
frame = step(videoSrc);
foreground = step(foregroundDetector, frame);
end
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