Abstract
In video coding, in-loop filter plays an essential role to reduce compression artifacts. This paper introduces a Fine-grained Region Adaptive Loop Filter (FR-ALF) approach for super-block coding based on the High Efficiency Video Coding (HEVC) framework. To address the over-smoothing and low-efficient problems, we introduce a flexible low-complexity FR-ALF method that achieves a finer granularity to control the filtering effect. Moreover, we design a new communication mechanism in order to avoid encoding the same overhead information. Experimental results show that compared with recent advances, our FR-ALF method achieves a satisfactory bit-rate saving by 2.76% on average, and consumes an affordable complexity increment.
Highlights
With the rapid growth of industrial video applications [1] (e.g. video-on-demand (VoD) [2], live over-the-top (OTT) [3], Television broadcasting, video surveillance and conferencing [4], 360 panoramic video [5], etc.), Ultra high-definition (UHD) video format is expected as one of the most attractive services in 5G network
High Efficiency Video Coding (HEVC) [7], [8] is the latest widely used video compression standard, which achieves the average coding efficiency by 50% bit-rate reduction compared with its predecessor H.264/Advanced Video Coding (AVC) under the same visual quality
Employs two in-loop filters to alleviate these artifacts and enhance the reconstruction quality of the reference frames: (1) Deblocking filter (DF) [10] is used to remove the blocking artifact appeared in the boundary of coding units (CUs); (2) Sample adaptive offset (SAO) [11] is adopted to reduce the ringing artifact based on the coding tree unit (CTU) level
Summary
With the rapid growth of industrial video applications [1] (e.g. video-on-demand (VoD) [2], live over-the-top (OTT) [3], Television broadcasting, video surveillance and conferencing [4], 360 panoramic video [5], etc.), Ultra high-definition (UHD) video format is expected as one of the most attractive services in 5G network. Super-block (e.g. a larger CTU size up to 512×512) has been studied to encode the UHD content, which achieves a higher coding efficiency based on the HEVC platform. We propose a new Fine-grained Region Adaptive Loop Filter (FR-ALF) method on the HEVC framework under the super-block condition. As CTU is extended to SCU for UHD video coding, the basic filtering block with the size equal to SCU can result in over-smoothing effect as shown in Fig. 1 (a). It is one of the main problems when applying for ALF based on the SCU coding in HEVC.
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