A Hardware Architecture for Adaptive Loop Filter in VVC Decoder

2021 ◽  
Author(s):  
Xin Wang ◽  
Heming Sun ◽  
Jiro Katto ◽  
Yibo Fan
Keyword(s):  
Hardware Architecture ◽  
Loop Filter ◽  
Adaptive Loop Filter

scholarly journals Extended multiple feature-based classifications for adaptive loop filtering

2019 ◽  
Vol 8 ◽  
Author(s):  
Johannes Erfurt ◽  
Wang-Q Lim ◽  
Heiko Schwarz ◽  
Detlev Marpe ◽  
Thomas Wiegand
Keyword(s):  
Video Compression ◽  
Main Idea ◽  
Loop Filter ◽  
Coding Efficiency ◽  
Multiple Feature ◽  
Wiener Filters ◽  
Feature Based ◽  
Block Based ◽  
Adaptive Loop Filter ◽  
Offset Filtering

Abstract Recent progress in video compression is seemingly reaching its limits making it very hard to improve coding efficiency significantly further. The adaptive loop filter (ALF) has been a topic of interest for many years. ALF reaches high coding gains and has motivated many researchers over the past years to further improve the state-of-the-art algorithms. The main idea of ALF is to apply a classification to partition the set of all sample locations into multiple classes. After that, Wiener filters are calculated and applied for each class. Therefore, the performance of ALF essentially relies on how its classification behaves. In this paper, we extensively analyze multiple feature-based classifications for ALF (MCALF) and extend the original MCALF by incorporating sample adaptive offset filtering. Furthermore, we derive new block-based classifications which can be applied in MCALF to reduce its complexity. Experimental results show that our extended MCALF can further improve compression efficiency compared to the original MCALF algorithm.

Research on the Algorithm of Adaptive Loop Filter Based on Flexible Quadtree

2013 ◽  
Vol 423-426 ◽  
pp. 2491-2495
Author(s):  
Gang Wang ◽  
He Xin Chen ◽  
Mian Shu Chen
Keyword(s):  
Wiener Filter ◽  
Wiener Filtering ◽  
Reconstructed Image ◽  
Optimal Size ◽  
Original Image ◽  
Deblocking Filter ◽  
Loop Filter ◽  
Coding Quality ◽  
Quad Tree ◽  
Adaptive Loop Filter

The algorithm of adaptive loop filter based on flexible quad tree (Q-ALF) is put forward targeting the problem that deblocking loop filter used by H.264/AVC cant further improve video coding quality. This algorithm, through the original image and the image after deblocking filter, works out wiener filter and selects a wiener filter with optimal size by taking the SAD of the image after Wiener filtering and the original image as RDO cost and based on RDO model, then uses this filter to filtrate the area that needs filtration. Simulation result shows that Q-ALF algorithm can improve the PSNR of the reconstructed image and decrease bit rate; meanwhile, Q-ALF algorithm can better eliminate blocking effect, improving the subjective performance of the reconstructed image.

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