DOI QR코드

DOI QR Code

영상 통신을 위한 웨이블릿 변환 부호화

Wavelet Transform Coding for Image Communication

  • 김용연 (인천대학교 정보통신과)
  • 투고 : 2010.12.29
  • 심사 : 2011.02.09
  • 발행 : 2011.02.28

초록

본 논문은 동영상을 효과적으로 부호화하기 위한 새로운 방법에 관하여 연구한 것이다. 움직임 정보를 이용하여 기준 프레임 영상과 상관관계가 적은 프레임 영상에서는 화질을 보장하고, 기준 프레임 영상과 상관관계가 많은 프레임 영상에서는 전체 동영상의 비트율을 보장하는 픽쳐 셋 필터를 제안하였다. 실험 결과, 제안한 동영상 부호화 방법은 기존의 전영역 탐색 블럭 정합 알고리즘에 비하여, 화질은 8.99dB이 향상되고, 압축률은 14.85배가 증가되었으며, 부호화시간은 74.9%가 단축되었다. 그리고, 차영상 알고리즘에 비하여, 화질은 24.87dB이 떨어졌으나, 압축률은 41.94배가 증가하였으며, 부호화시간은 0.9%가 단축됨으로써 좋은 성능을 나타냄을 확인하였다.

In this paper, a new method for effective video coding is studied. Picture set filter is proposed for preserving compression ratio and video quality. This filter controls the compression ratio of each frame depending on the correlation to the reference frame by selectively eliminating less important high-resolution areas. Consequently, video quality can be preserved and bit rate can be controlled adaptively. In the simulation, to test the performance of the proposed coding method, comparisons with the full search block matching algorithm and the differential image coding algorithm are made. In the former case, video quality, compression ratio and encoding time is improved. In the latter case, video quality is degraded, but compression ratio and encoding time is improved. Consequently, the proposed method shows a reasonably good performance over existing ones.

키워드

참고문헌

  1. S.Eckart, "High-performance software MPEG vido player for PCs", SPIE/IS&T, vol. 2419, pp.446-454, Feb. 1995.
  2. K.N.Ngab, J.Arnold, T.Sikora, T.K.Tan and A.W.Johnson, "Frequency Scalability Experiments for MPEG-2 Standard", Asia-Pacific Conference on Commun., Korea, pp.208-212, Aug., 1993.
  3. A.M.Ferman, B.Gunsel and A.M.Tekalp, "Objetbased indexing of MPEG-4 compressed video", Visual Commun., Image Processing'97, vol. 3024, pp.953-963, Mar. 1997.
  4. C.W.Yap, K.N.Ngan and R.Liyanapathirana, "Error-protection scheme for the transmission of H.263 coded video over mobile radio channels", Visual Commun., Image Processing '97, vol. 3024, pp.1241-1249, Feb. 1997.
  5. O.Rioul, "Regular Wavelets: A Discrete-time approach", IEEE Trans. Signal Proc., vol. 41, no. 12, pp.241-250, Dec. 1993.
  6. M.F.Barnsley and S.Demko, "Iterated function systems and the global construction of fractals", Proc. of Royal Soc. London vol. A399, pp.243-275, 1985.
  7. Michael Hotter, "Optimization and Efficiency of an Object-Oriented Analysis-Synthesis Coder", IEEE Trans. on Circuits and systems for video Tech., vol. 4, pp.569-582, April 1994.
  8. T.K.Truong et al., "A New Architecture for the 2-D Discrete Wavelet Transform", IEEE Pacific Rim Confer. on Commun., Computers and Sig. Process., vol. 2, pp.481-484, Aug. 1997.
  9. M.antonini and M.Barlaud, "Image Coding Using Wavelet Transform", IEEE Trans. on Image Process., vol. 1, no. 2, pp.205-220, Apr. 1992. https://doi.org/10.1109/83.136597
  10. S.Sarkar and H.V.Poor, "Multiband cyclic wavelets transform", ICIP-96 Proc. vol. II, pp.589-592, Sept., 1996.