Multiple Description of MPEG-4 Visual by Quantization Operation

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  • 量子化操作によるMPEG-4映像符号化の多重記述
  • リョウシカ ソウサ ニ ヨル MPEG 4 エイゾウ フゴウカ ノ タジュウ キジュツ

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Abstract

Multiple description video coding which composes multiple-quantization operations at decoder for PSNR improvement, maintaining conventional coding algorithm such as MPEG-4 visual, is proposed. The proposed method is applicable to video transmission over integrated wireless services comprising multiple wireless-access networks such as wireless LAN and cellular networks. Quantized DCT coefficients of the same block quantized using different quantization parameters are in general different. The proposed method narrows down DCT coefficient value (true value) before quantization, and operates quantization parameter in order to utilize the DCT coefficient value narrowed. MPEG-4 visual based simulation demonstrates 0.5-1.0dB PSNR decoder gain of the proposed method.

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