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SUMMARY:Pre-processing of HDR video in the YCbCr color space\, luma and ch
 roma adjustment - Jacob Strom\, Ericsson Research
DTSTART:20200220T141500Z
DTEND:20200220T150000Z
UID:TALK139945@talks.cam.ac.uk
CONTACT:65221
DESCRIPTION:The talk describes two pre-processing methods useful for conve
 rting linear RGB data to a Y′CbCr 4:2:0 representation\, especially help
 ful for high dynamic range (HDR) video. The methods target the luminance a
 rtifacts that can arise in saturated colors after compression when Y′CbC
 r 4:2:0 is used together with the perceptual quantizer (PQ) transfer funct
 ion. The first pre-processing method\, called luma adjustment\, can remove
  the luminance artifacts\, but the artifacts can reappear when the Y'CbCr 
 data is compressed. The second method\, called chroma adjustment\, removes
  the artifacts in a way that is more robust to compression. Moreover\, the
  resulting Y′CbCr 4:2:0 representation leads to higher compression effic
 iency\, with a measured Bjontegaard-Delta rate (BD-rate) change of −2.4%
 . Subjective improvements in compressed material are also clearly visible.
LOCATION:FW11 Meeting Room\, Computer Laboratory
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