IPIU 1997 (제9회 영상처리 및 이해에 관한 워크샵)
Current Result Document :
| 한글제목(Korean Title) |
저전송율 동영상에서 부호화 잡음 제거를 위한 적웅형 루프 필터 |
| 영문제목(English Title) |
Adaptive Loop Filter for Coding Noise Reduction in Low Bit-rate Video |
| 저자(Author) |
노규찬
이상회
김재균
Kyu-Chan Roh
Sang-hee Lee
Jae-Kyoon Kim
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| 원문수록처(Citation) |
VOL 09 NO. 01 PP. 0143 ~ 0148 (1997. 01) |
한글내용
(Korean Abstract) |
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영문내용
(English Abstract) |
Most of picture coding standards, including H.263, use the block-based processing for the motion estimation and the discrete cosine transform (DCT). This block-based processing induces the well-known coding artifacts, in particular, when an image is highly compressed. The typical coding artifacts are the grid noise in the monotone area and the staircase noise along the image edges. In this paper, we propose a new filtering method for the removal of the grid noise and the staircase noise. Here, a signal adaptive lowpass filter is used to smooth the pixels in the monotone area and the pixels that are close to an edge. As for the pixels at edges, a new criterion is introduced to reduce the staircase noise and ringing noise without blurring the edge sharpness. In addition, space-variant lowpass filter is used at block boundaries to reduce the grid noise if the difference of the slope of intensity across the block boundaries and that of their neighbors is high. We apply this method to loop filter in H.263 video coding for SIF and QCIF resolution sequence. The proposed filter has 0. I ∼ 0.9dB gain in PSNR and the subjective image quality is also enhanced.
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