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With a stereo camera you can either recognize objects using the processed pointcloud or directly on the image. For that, I recommend you to take a look at PCL and OpenCV detection algorithms or example implementations. What kind of objects do you want to recognize?

With a stereo camera you can either recognize objects using the processed pointcloud or directly on the image. For that, I recommend you to take a look at PCL and OpenCV detection algorithms or example implementations. What kind of objects do you want to recognize?

With cans I would start detecting ellipses in the image, or if the cans have a specific colour I would use the color and the depth information to group different cans together.

This question is too localized.