전자공학회논문지B (Journal of the Korean Institute of Telematics and Electronics B)
- 제31B권11호
- /
- Pages.78-87
- /
- 1994
- /
- 1016-135X(pISSN)
DCT 변환계수의 인덱스의존 (줄길이, 레벨) 부호화
Frequency Dependent (Runlength, Level) Coding of DCT Coefficients
- Lee, Jong-Hwa (Tech. Research Institute, KBS) ;
- Kang, Dong-Wook (Dept. of Elec. Eng., Seoul Nat'l Univ.) ;
- Kang, Su-Won (Dept. of Elec. Eng., Seoul Nat'l Univ.) ;
- Chang, Joon-Ho (Dept. of Elec. Eng., Seoul Nat'l Univ.) ;
- Lee, Choong-Woong (Dept. of Elec. Eng., Seoul Nat'l Univ.)
- 발행 : 1994.11.01
초록
본 논문에서는 확률분포함수의 구조적인 차이를 이용하여, DCT계수를 효율적으로 부호화하는 새로운 접근에 대하여 논의하였다. 신호원 모델에 따라 신호를 분리함으로써 신호의 엔트로피를 감소시킬 수 있음을 해석적으로 증명하였으며, (줄길이, 레벨) 심볼들을 그 심복의 인덱스에 따라 적응적으로 부호화함으로써 평균부호길이가 감소함을 실험을 통하여 보였다.
In this paper, we have addressed a new approach to encode the DCT coefficients efficiently by exploiting the structural differences among the probability distribution functions of them. We have proved analytically that if signals are separated according to their source models, the entropy of the separated signals decreases below that of the unseparated signals. And simulation results show that the average codelength decrease when each (runlength, level) symbol is encoded adaptively according to the index associated with the symbol.
키워드