High Efficiency Video Coding (HEVC) by Vivienne Sze Madhukar Budagavi & Gary J. Sullivan

Author:Vivienne Sze, Madhukar Budagavi & Gary J. Sullivan
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 7.3Example of block artifact in one dimension [37]

Deblocking filter attenuates the artifacts in the areas, where they are mostly visible, i.e. in the smooth, uniform areas. The excessive filtering in the highly detailed areas should be avoided since it can cause undesirable blurring. The artifacts in those areas are rarely noticed by the human eye, while it is also more difficult to determine whether the discontinuity is caused by a block boundary or belongs to the original signal [27]. Therefore, an important part of the deblocking filter is the deblocking filtering decisions, which determine whether a particular part of a block boundary is to be filtered. In these decisions, the HEVC deblocking filter uses the mode and motion information from the decoded bitstream as well as analyses the values of reconstructed samples on the sides of the block boundary. The strength of the deblocking filter can also be adjusted by the encoder on the picture and the slice basis.

Section 7.2.2 provides a description of the HEVC deblocking filer, while Sect. 7.5.1 discusses the coding efficiency and subjective quality improvements brought by HEVC deblocking filtering. The deblocking filter complexity and parallelization aspects are addressed in Sect. 7.4.1.

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