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CE1-related: Long luma deblocking filter decision modification
Abstract
This document is Draft 7 of a new ITU-T Recommendation and ISO/IEC International Standard entitled Versatile Video Coding. It has been developed by a joint collaborative team of ITU-T and ISO/IEC experts known as the Joint Video Experts Team (JVET), which is a partnership of ITU-T Study Group 16 Question 6 (known as VCEG) and ISO/IEC JTC 1/SC 29/WG 11 (known as MPEG). This draft new standard has been designed with two primary goals. The first of these is to specify a video coding technology with a compression capability that is substantially beyond that of the prior generations of such standards, and the second is for this technology to be highly versatile for effective use in a broadened range of applications. Some key application areas for the use of this standard particularly include ultra-high-definition video (e.g., with 3840×2160 or 7620×4320 picture resolution and bit depth of 10 or 12 bits as specified in Rec. ITU-R BT.2100), video with a high dynamic range and wide colour gamut (e.g., with the perceptual quantization or hybrid log-gamma transfer characteristics specified in Rec. ITU-R BT.2100), and video for immersive media applications such as 360° omnidirectional video projected using a common projection format such as the equirectangular or cubemap projection format, in addition to the applications that have commonly been addressed by prior video coding standards.
JVET-Q0322 CE1-related: Long luma deblocking filter decision modification [H.-B. Teo, C. Wang, C.-S. Lim (Panasonic)]
It is claimed that sometimes filtering for long luma deblocking is applied, although it should not be. The wrong decision is asserted to sometimes cause visual artefacts. This contribution proposed to fix the problem by changing the position of the samples used for the gradient checks when max filter length equal to 7.
The BDR impact versus VTM-7.0 is 0.00%, 0.01%, -0.02%, 0.03% for AI/RA/LDB/LDP.
It was commented that the solution adopted in CE1-1 targets solving the same problem of oversmoothing of the long filter. It is further pointed out that the suggested approach does not consider the gradient between p0/p1 and q0/q1 which are rather important in deblocking (gradient close to the block edge) which might cause other problems.
It would be too much of an effort, considering the short time until finalization of the standard, to investigate this in detail.
No action was taken on this.
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Cited:
Decisions
No action was taken on this.
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