Preprocessing with motion information from MPEG encoder
Yiu-fai Wong, Eric Viscito · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1996
We describe a motion-compensated filtering scheme for preprocessing of video based on motion vectors computed from an MPEG encoder. A modified clustering filter is used to filter the pixels in the spatiotemporal kernel generated by the motion trajectories. The filter scheme can be incorporated into the encoder with very slight modifications, since it uses the results of the encoder motion estimation to filter each image prior to performing the rest of the encoding functions. In this way, our work differs from previous work that require additional motion estimation. We have tested our scheme with different types of noise. It is observed that the motion estimation in the encoder is more accurate, resulting in the motion-compensated difference signal that has smaller energies. This leads to finer quantization. Visual quality of the compressed video is significantly enhanced. Furthermore, reduced noise leads to better performance of other modules that rely on the statistics of the intermediate signals (for example, the intra/inter coding decision).