A post-processing method for vector quantization to achieve higher PSNR and nearly constant bit rate

Zhibin Pan, Koji Kotani, Tadahiro Ohmi

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

In conventional vector quantization (VQ) encoding method, the reachable beat PSNR can be realized by full search (FS) equivalent method when codebook is fixed. To achieve even higher PSNR and almost not degraded bit rate, a post-processing method for VQ encoding is proposed in this paper. This method first checks how well the matching is for an image block after conventional VQ by its block PSNRb. Then it partitions a bad matched image block into 2 partial blocks by a certain pattern (a pair of masks) further and encodes them again just within a small already encoded nearby area. The overall matching can generally be made better due to using 2 smaller partial blocks. Meanwhile bit rate can be kept nearly constant by using 2 shorter winner pointers instead of 2 winner indexes finally. At the receiver, the bad matched image block is synthesized in reverse way to realize a better reconstruction. In the case of low-detailed image Splash, image PSNR can be improved more than 1 dB for 1024 codebook while bit rate has almost not degraded.

Original languageEnglish
Pages (from-to)II436-II439
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume2
Publication statusPublished - 2003 Jul 14
EventProceedings of the 2003 IEEE International Symposium on Circuits and Systems - Bangkok, Thailand
Duration: 2003 May 252003 May 28

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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