Calculate Centroid of ractangle

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

Answer 1

[Image Analyst]

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;

[Biswas Lohani V K]

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.