Opened 8 years ago

Closed 8 years ago

#1199 closed defect (invalid)

May a mismatch between HEVC spec and HM on clip of qPiCb

Reported by: C.Lai Owned by:
Priority: minor Milestone:
Component: HM Version: HM-12.0
Keywords: Cc: fbossen, ksuehring, davidf, jct-vc@…

Description

In spec, qPiCb = Clip3( −QpBdOffsetC, 57, QpY + pps_cb_qp_offset + slice_cb_qp_offset ) (8-260),
In HM software(HM12.1),
#define QpUV(iQpY) ( ((iQpY) < 0) ? (iQpY) : (((iQpY) > 57) ? ((iQpY)-6) : g_aucChromaScale[(iQpY)]) )

It seems no clip operation in the HM software.

Change History (2)

comment:1 Changed 8 years ago by DefaultCC Plugin

  • Cc fbossen ksuehring davidf jct-vc@… added

comment:2 Changed 8 years ago by davidf

  • Milestone HM-12.1 deleted
  • Resolution set to invalid
  • Status changed from new to closed

Eqn. 8-260 corresponds to source:tags/HM-12.0/source/Lib/TLibCommon/TComTrQuant.cpp#L202

qpScaled = Clip3( -qpBdOffset, 57, qpy + chromaQPOffset );

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