Calculate Centroid of ractangle

Question

Biswas Lohani V K 2016-6-3

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/287500-calculate-centroid-of-ractangle

评论： Biswas Lohani V K 2016-6-6

How can i modify this code to calculate the centroid of ractangular box as shown in the figure below.

peopleDetector = vision.PeopleDetector;

I = imread('detectman.jpg');

bboxes = step(peopleDetector, I);

people = insertObjectAnnotation(I, 'rectangle', bboxes, 'people');

figure, imshow(people)

I appreciate your feedaback and suggestion.

Thank you,

Regards,

Biswas

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Answer 1

Image Analyst 2016-6-5

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/287500-calculate-centroid-of-ractangle#answer_224513

在 MATLAB Online 中打开

bboxes is probably in the form [left, top, width, height] like rectangles usually are in MATLAB code. So the centroid is

xCentroid = bboxes(1) + bboxes(3)/2;
yCentroid = bboxes(2) + bboxes(4)/2;

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Biswas Lohani V K 2016-6-6

在 MATLAB Online 中打开

Yes i implemented it in a recorded video.now i want to store this centroid in an array so that i can plot a graph from that values.

videoFReader = vision.VideoFileReader('new.mp4');

videoPlayer = vision.VideoPlayer;

time=1;

len = 250;

xCentroid = zeros(len,1);

yCentroid = zeros(len,1);

while ~isDone(videoFReader)

   peopleDetector = vision.PeopleDetector;
   frame = step(videoFReader);
   bboxes = step(peopleDetector, frame);
   people = insertObjectAnnotation(frame, 'rectangle', bboxes, 'people');
   hold on
   for object = 1:length(bboxes)
   time = time + 1;t = 2:time;
     xCentroid(time+1) = bboxes(1) + bboxes(3)/2;
   yCentroid(time+1) = bboxes(2) + bboxes(4)/2;
   end
   hold off
    imshow(people);
   step(videoPlayer,frame);
end
release(videoFReader);
release(videoPlayer);