Opened 4 years ago

#1432 new defect

Error in Truncated Binary binarisation process.

Reported by: adil.parvez Owned by:
Priority: minor Milestone:
Component: SCC text Version:
Keywords: binarisation Cc: rajan_joshi, jct-vc@…

Description

In JCTVC-U1005-v2.doc, in 9.3.3.6 Truncated Binary (TB) binarization process.
Equation block 9-17 says

u = 2k + 1 - n,

this should be

u = 2(k + 1) - n, or u = 1 << (k + 1) - n.

Also the accompanying text doesn't make sense, in the invoked FL processes we want the variable fixedLength to equal k, k + 1 respectively. So consider introducing a binary binarisation process where we specify the number of bits with which we write the symbol value.

Then

– Otherwise, if synVal less than u, the TB bin string is derived by invoking the FL binarization process specified in clause 9.3.3.5 for synVal with the input symbolVal set to k and with cMax.

becomes

– Otherwise, if synVal less than u, the TB bin string is derived by invoking the Binary binarization process specified in clause X.X.X.X for synVal with numBits set to k.

And

– Otherwise (synVal greater than or equal to u), the TB bin string is derived by invoking the FL binarization process specified in clause 9.3.3.5 for synVal + u with the input symbolVal set to ( k + 1 ) and with cMax.

becomes

– Otherwise (synVal greater than or equal to u), the TB bin string is derived by invoking the Binary binarization process specified in clause X.X.X.X for synVal + u with numBits set to k + 1.

Finally consider replacing synVal with symbolVal for consistency with the other binarisation processes.

Change History (0)

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