Hybrid Domain Collaborative Post-Filter for Lossy Still Image Coding

Abstract

An image encoding device, which includes an image reconstruction unit for reconstructing an image; a parameter determination unit for: one or more first parameters based on the reconstructed image and one or more first parameters based on codec signaling information a second parameter to determine one or more filter parameters; a hybrid domain filtering unit configured to: based on the determined filter parameters, filter the reconstructed image in the frequency domain and pixel domain to obtain a filtered image .

Description

technical field [0001] The present invention relates to an image encoding device, a system including an image encoding device and an image decoding device, and a still image encoding method. The invention also relates to a computer-readable storage medium storing program code comprising instructions for performing the method. Background technique [0002] Still image compression techniques are available for still image codecs such as H.264 / AVC, H.265 / HEVC, and JPEG. Post-filtering can improve the decoded image quality. There are two base classes of post-filtering: encoder-side post-filtering and decoder-side post-filtering. [0003] In the case of encoder-side post-filtering, filter parameters are estimated at the encoder side and then passed to the decoder side. The decoder restores the post-filter parameters after transmission and applies the filter parameters to the decoded image filtering before sending to the end user. In this case, filter design and filter paramete...

AI Technical Summary

Problems solved by technology

[0015] Despite the advantages of the ALF structure, image coding still needs to be improved

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