Calculate Centroid of ractangle

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Biswas Lohani V K
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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回答（1 个）

Image Analyst
Image Analyst 2016-6-5
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;
  1 个评论
Biswas Lohani V K
Biswas Lohani V K 2016-6-6
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);
i have tried with this code but i have got wrong value.
so could you please have a look on code so i that i can solve this problem.
Thank you.

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