Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Directional Block Loss Recovery sing Hypothesis Testing Problem

가설 검증 기법을 이용한 방향성을 가지는 손실 블록의 복구

  • Published : 2008.09.25
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Abstract

In this paper, we present a directional error concealment technique to compensate a lost block. Generally, the strong edge of an image has the large amounts of the variance because of its large coefficients in the wavelet domain. For estimating edge direction of a lost block, a $X^2$ hypothesis-testing problem is applied using the variance of wavelet coefficients. The lost block is interpolated according to the estimated edge direction. The pixels for interpolation is obtained from the edge direction. The proposed method outperforms the previous methods in objective and subjective qualities.

본 논문에서는 손실된 블록의 은닉을 위한 방향성을 가지는 블록 복구 방법을 제안한다. 일반적으로 영상의 강한 에지는 웨이블릿 영역에서 큰 계수 값을 가지기 때문에 분산 또한 큰 값으로 나타난다. 손실 블록의 에지 방향을 추정하기 위해서 웨이블릿 계수들의 분산을 이용한 $X^2$ 가설 검증 기법을 적용한단. 추정된 에지의 방향에 따라 보간을 수행하며, 손실 화소를 보간하기 위하여 사용되는 화소는 에지 방향에 따라 결정된다. 제안 방법은 이전 방법과의 성능비교에서 주관적으로나 객관적으로 나 더 좋은 성능을 나타낸다.

Keywords

References

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