Global motion estimation
Global motion estimation, as the name suggests, is the detection of motion using all pixels in a frame in its calculation. Some of the applications of global motion estimation include:
- Video stabilization
- Video encoding/decoding
- Object segmentation
This method was proposed by Bergen et.al. (1992). In this method, when the distance between the camera and the background scenes is large, we can approximate the motion of objects as affine transformations. The equations we saw earlier were as follows:
We can rewrite these equations in the matrix form as follows:
This can be written as .
According to the optical flow equation:
We try ...
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