Recently Hisilicon engineers unveiled some new image processing and encoding technologies to enhance imaging performance for the surveillance dedicated SoCs. According to the press release, the new technology - “pre-filtering encoding technique” can greatly reduce or eliminate the artifact. This overcomes temporal pumping artifact which is a typical problem for video encoding which often occurred for IP camera applications and seriously degrades the subjective video quality.
Pre-filtering encoding performs the block level-based temporal filtering for I frames, their subjective video quality is maintained consistent with their previous P frames, hence the entire video sequence is encoded with relatively stable quality so that pumping artifact is barely seen during the playback.