This chapter showed a relatively simple and yet surprisingly robust way of recognizing a variety of hand gestures by counting the number of extended fingers.

The algorithm first shows how a task-relevant region of the image can be segmented using depth information acquired from a Microsoft Kinect 3D Sensor, and how morphological operations can be used to clean up the segmentation result. By analyzing the shape of the segmented hand region, the algorithm comes up with a way to classify hand gestures based on the types of convexity effects found in the image. Once again, mastering our use of OpenCV to perform a desired task did not require us to produce a large amount of code. Instead, we were challenged to gain an important insight that ...

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