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Computer Vision for the Web by Foat Akhmadeev

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Optical flow for motion estimation

We saw how to track different objects in a scene and how to make a human interface using them, but we did not see a more generalized approach. When an object changes its position, it moves through a scene and it is interesting to estimate the overall movement of the scene. Here, we will introduce the concept of optical flow, and will see how to use it for object tracking. In the first part, we will focus on the theory and then present two wonderful examples of the optical flow usage. Finally, we will create a simple gesture application.

The Lucas-Kanade optical flow

There are many definitions of optical flow, the main one is: it is the change in structured intensities of an image due to relative motion between ...

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