How to crop images and save it to matrix after vision.For​egroundDet​ector

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Kong
Kong 2020-3-19
评论： Image Analyst 2020-3-22
Hello. Vision.ForegroundDetector is so amazing!
Could you let me know how to get several images inbox as a matrix?
I want to save these images as matrix.
I want to use several images like this. How can I crop this like image?
I am using this code.
videoSource = VideoReader('shahar_run.avi');
detector = vision.ForegroundDetector(...
'NumTrainingFrames', 5, ...
'InitialVariance', 30*30);
blob = vision.BlobAnalysis(...
'CentroidOutputPort', false, 'AreaOutputPort', false, ...
'BoundingBoxOutputPort', true, ...
'MinimumBlobAreaSource', 'Property', 'MinimumBlobArea', 250);
shapeInserter = vision.ShapeInserter('BorderColor','White');
videoPlayer = vision.VideoPlayer();
while hasFrame(videoSource)
frame = readFrame(videoSource);
fgMask = detector(frame);
bbox = blob(fgMask);
out = shapeInserter(fgMask,bbox);
videoPlayer(out);
pause(0.1);
end

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-3-22
Check the following code
videoSource = VideoReader('denis_wave2.avi');
detector = vision.ForegroundDetector(...
'NumTrainingFrames', 5, ...
'InitialVariance', 30*30);
blob = vision.BlobAnalysis(...
'CentroidOutputPort', false, 'AreaOutputPort', false, ...
'BoundingBoxOutputPort', true, ...
'MinimumBlobAreaSource', 'Property', 'MinimumBlobArea', 50);
shapeInserter = vision.ShapeInserter('BorderColor','White');
videoPlayer = vision.VideoPlayer();
bounding_boxes = {};
while hasFrame(videoSource)
frame = readFrame(videoSource);
fgMask = detector(frame);
bbox = blob(fgMask);
for i=1:size(bbox, 1)
x = bbox(i, :);
bounding_boxes{end+1} = fgMask(x(2):sum(x([2 4])), x(1):sum(x([1 3])));
end
out = shapeInserter(fgMask,bbox);
videoPlayer(out);
pause(0.1);
end
The bounding_boxes is a cell array and its each element is a cropped image. You can check the output as
imshow(bounding_boxes{1})
imshow(bounding_boxes{2})
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