How to select a particular region in a image, and segment it & compare it ?

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ravi k
ravi k 2016-4-25
回答： Image Analyst 2016-5-7
Hi all, I'm doing a project on Vacant parking space detection. I can able to detect the change in the entire frame but I want to detect for only particular space. can any one help? Thanks in advance.
video = VideoReader('demo_parking.mp4');
I = read(video,1);
Background = read(video,1);
Background1 =abs(Background - I);
for k = 1:500
if k== 1
Background = read(video,1);
else
% Change background slightly at each frame
% Background(t+1)=(1-alpha)*I+alpha*Background
Background1 =abs(Background - I);
end
I=k;
k=k+12;
grayImage = rgb2gray(Background1); % Convert to gray level
thresholdLevel = graythresh(grayImage); % Get threshold.
binaryImage = im2bw( grayImage, thresholdLevel); % Do the binarization
binaryImage = bwareaopen(binaryImage,1000);
se = strel('square', 5);
binaryImage=imdilate(binaryImage,se);
figure,imshow(binaryImage);
labeledImage = bwlabel(binaryImage, 8);
stats = regionprops(labeledImage,'BoundingBox','Area');
count=0;
total=8;
for j = 1 : length(stats)
thisBB = stats(j).BoundingBox;
rectangle('Position', [thisBB(1),thisBB(2),thisBB(3),thisBB(4)],...
'EdgeColor','g','LineWidth',1 );
count=count+1;
end
disp(['No of parked vehicles are ',num2str(count)]);
disp(['No of available slots ',num2str(total-count)]);
end

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回答（1 个）

Image Analyst
Image Analyst 2016-5-7
Use a template. Use roipoly() or roipolyold() to define the spaces on one of the frames. You can save the vertex coordinates in a .mat file if you want.

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