A Diffusion Model Based Quality Enhancement Method for HEVC Compressed Video
This work addresses a practical limitation in video compression enhancement for decoders, though it is incremental in applying diffusion models to this specific domain.
The paper tackles the problem of enhancing the quality of HEVC compressed videos when quantization parameters are unknown by proposing a diffusion model that estimates feature vectors as prior information, achieving superior results on mixed datasets compared to existing methods.
Video post-processing methods can improve the quality of compressed videos at the decoder side. Most of the existing methods need to train corresponding models for compressed videos with different quantization parameters to improve the quality of compressed videos. However, in most cases, the quantization parameters of the decoded video are unknown. This makes existing methods have their limitations in improving video quality. To tackle this problem, this work proposes a diffusion model based post-processing method for compressed videos. The proposed method first estimates the feature vectors of the compressed video and then uses the estimated feature vectors as the prior information for the quality enhancement model to adaptively enhance the quality of compressed video with different quantization parameters. Experimental results show that the quality enhancement results of our proposed method on mixed datasets are superior to existing methods.