How to obtain centroids from cascade object detector?
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William Maurer
on 7 Jun 2015
Answered: Dima Lisin
on 12 Jun 2015
I am having trouble determining a way to get centroids from objects detected by a trained object detector- the only output seems to be bounding boxes. Is there another way I could get the centroid coordinates for the detected HOG features?
code:
detector = vision.CascadeObjectDetector('Detector3.xml');
detector.MergeThreshold = 3;
img = imread('Test_image.jpg');
[bbox] = step(detector,img)
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Accepted Answer
Image Analyst
on 7 Jun 2015
If you have a binary image you could use regionprops(). See my Image Segmentation Tutorial http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 for a full demo.
More Answers (1)
Dima Lisin
on 12 Jun 2015
Hi William,
The best you can do, is to get the centroid of the box. The bounding box format is [x, y, widht, height]. So the centroid is [x+width/2, y+height/2]. or for multiple bboxes: [bbox(:,1)+bbox(:,3)/2, bbox(:,2)+bbox(:,4)/2].
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