MATLAB: Extract object from depth image.

Question

I have 2 depth images where the a rectangular shaped object is present. I’d like to extract the rectangular object from the images. I have attached here the original depth images and below I show the converted 8 bit image for the purpose of visualization.

Image-1:

Image-2:

I think I have to use binary image and then use bounding box to extract the object. However, I can’t figure out how exactly I should proceed with the coding.

It would be great to have any suggestions.

Answer 1

You can simply threshold at whatever depths you believe the object to be at, then call regionprops():

binaryImage = depthImage > depth1 & depthImage < depth2;
binaryImage = bwareafilt(binaryImage, 1); % Extract largest blob only.
props = regionprops(binaryImage, 'BoundingBox');
boundingBox = props.BoundingBox