Fast VQ Codebook Search Algorithms Using Index Table

인덱스 테이블을 이용한 고속 VQ 코드북 탐색 알고리즘

  • 황재호 (극동정보대학 멀티미디어과) ;
  • 곽윤식 (충주대학교 컴퓨터공학과) ;
  • 홍충선 (경희대학교 전자정보학부) ;
  • 이대영 (경희대학교 전자정보학부)
  • Published : 2000.10.01

Abstract

In this paper, we propose two fast VQ coclebook search algorithms efficient to the Wavelet/ VQ coding schemes. It is well known that the probability having large values in wavelet coefficient blocks is very low. In order to apply this property to codebook search, the index tables of the reordered codebook in each wavelet subband ae used. The exil condition in PDE can be satisfied in an earlystage by comparing the large coefficients of the codeword with their corresponding elements of input vector using the index tbles. As a result, search time can be reduced.

본 논문에서는 Wavelet/VQ 코딩 기법에 효율적인 두 가지의 고속 VQ 코드북 탐색 알고리즘을 제안한다. 웨이브렛 계수 블록 내에서 코드북의 코드워드들의 원소, 즉 웨이브렛 계수가 큰 값을 가질 확률이 적다. 이러한 특성을 코드북 탐색에 이용하기 위하여 각 서브밴드에서 코드워드의 에너지 크기로 재정렬된 인덱스 테이블을 이용한다. 코드북 탐색 시 인덱스 테이블을 이용하여 코드워드의 큰 계수 값과 그에 대응하는 입력벡터의 원소를 먼저 비교함으로써 PDE의 탈출 조건을 조기에 만족하게 되어 탐색 시간이 줄어들게 된다.

Keywords

References

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