MATLAB: How, to further perform the bounded box only from a video frame for gesture recognition.

computer visionComputer Vision Toolboxgesturehandreal time video processing

Upto now, I can successfully detect the hand from a video. Now, i want to extract hog features of that bounded box only for gesture recognition. How, can I do that? I was following this video tutorial but i get lost during queryFisherVector extraction. Can anyone provide me some documentation link, or video tutorial or some file exchange link or explain here. Edit: You people may feel bored to go through whole video so lets ignore that, just show me the path how can I extract features for gesture recognition frame to frame or is there any efficient way for doing so. I need to process only the bounded box. Thank you.

Best Answer

You get a bounding box. You use imcrop() or indexing to extract the portion of the image within that box, creating a new image. You apply HOG to the new image.

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Hi Sangchai,

I think the ‘CascadeObjectDetector’object returns only a square.

You can use the following code in place of the call to the ‘insertshape()’ function to achieve the change.

   [xlim,ylim] = boundingbox(polyshape(points.Location(:,1),points.Location(:,2)));
   tl=[xlim(1) ylim(1)];
   dr=[xlim(2) ylim(2)];
   tr=[dr(1) tl(2)];
   l=pdist([dr;tr]);
   w=pdist([tl;tr]);
   videoFrame = insertShape(videoFrame, 'Rectangle', [tl,w,l], 'LineWidth', 3);

MATLAB: Does the videoplayer hang at the first frame while streaming live camera.

Sounds like the size of your frame has changed. Most likely it went from being M-by-N grayscale to M-by-N-by-3 RGB or vice versa.

It looks like you are getting grayscale images from the camera, but insertShape and insertMarker always return RGB images. Could there be a situation when sometimes you call insertShape and sometimes you don't? That would result in videoFrame having a different size, which would cause the error you are seeing.

Best Answer

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MATLAB: How to reshape bounding box when I rotate the face for live video

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