Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Adaptive QP Selection using residual transform coefficients of block

블록의 잔여 변환 계수를 이용한 적응적인 QP 선택

  • 전혜민 (세종대학교 컴퓨터공학과 DMS 연구실) ;
  • 서정훈 (세종대학교 컴퓨터공학과 DMS 연구실) ;
  • 이영렬 (세종대학교 컴퓨터공학과 DMS 연구실)
  • Published : 2009.03.30
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Abstract

In H.264/AVC, if each block is quantized with a adaptive quantization parameter(QP) regardless of the characteristics of a block, it could be the deterioration of the picture quality. In this paper, an adaptive block-based QP selection method is proposed in order to improve picture quality by utilizing the bit amounts of the zigzag-scanned integer transform coefficients of the neighboring blocks and changing the QP value in the current block. The proposed method works in the same way as the encoder and decoder without transmitting the change of QP value to the decoder side. The experimental results show that the proposed method achieves a gain of about $0.1\sim0.3dB$ compared with H.264/AVC.

H.264/AVC에서 각 블록은 블록의 특성을 고려하여 적응적으로 양자화 파라미터(QP)를 선택하여 양자화를 수행한다면, 개선된 화질을 기대할 수 있다. 본 논문에서는, 블록 기반의 적응적인 QP 선택 방법은 주변 블록들의 지그재그 스캔 된 정수 변환 계수의 비트량과 현재 블록의 QP 값 변화를 이용하여 화질을 개선하도록 제안된다. 제안된 방법은 QP 값의 변화를 디코더로 전송하지 않고, 인코더에서와 같은 방법으로 디코더에서 직접 처리한다. 제안된 방법의 실험 결과는 H.264/AVC에 비하여 대략 $0.1{\sim}0.3\;dB$ 정도의 성능 향상을 보인다.

Keywords

References

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