基于分块三维小波变换的视频图像序列编码方法的研究
AN ALGORITHM FOR VIDEO SIGNAL CODING BASED ON 3D-WAVELET TRANSFORMATION
-
摘要: 该文给出了一种基于分块三维小波变换的视频图像序列编码方法。将视频图像序列中表示帧序的t坐标代换成z坐标后,可把一视频图像序列看成是三维空间中的体。将视频图像序列分成子块后,仿照二维图像小波变换的方法,将它作三维小波变换。变换后的图像能量主要集中于低频波段,这些波段对该视频图像序列的视觉效果影响最大。将不同波段按不同的精度量化并进行熵编码,可以达到去除帧内和帧间冗余、压缩数据的目的。试验表明,使用这种方法可以达到较好的压缩效果。此方法直观,速度也比较快。
-
关键词:
- 小波; 三维小波变换; 视频图像编码
Abstract: This paper presents an algorithm for video signal coding based on 3D-wavelet transformation. When the frame order t of the video signal is replaced by order z,the video signal can be looked as a block in the 3D-space. After split the block into smaller sub-blocks,imitate the method of 2D-wavelet transformation for image, the sub-blocks can be transformed with 3D-wavelet. Most of the video signal energy is in the transformed low-frequency bands.These bands affected the visual quality of the video signal most. After quantizing different bandswith different precision and entropy coding each band, the inter- and intra-frame redundancies of the video signal can be eliminated and the data can be compressed. The simulation experiments show that this algorithm can achieve very good result. -
Koenen R. Overview of the MPEG-4 Standard, International Organization for Standardization, ISO/IEC JTC1/SC29/WG11, Coding of Moving Pictures and Audio,ISO/IEC JTC1/SC29/WG11 N2725, March 1999/Seoul, South Korea. ［2］Chui C K. An Introduction to Wavelets. Academic Press, Inc.,1992,66-229.[2]Sweldens W. The construction and application of wavelets in numerical analysis, Ph.D.Thesis,Department of Computer Science, Katholieke Universiteit Leuven, Belgium: May 25,1994,11-191.[3]Davis G M, Nosratinia A. Wavelet-based image coding: An overview. Applied and Computational Control, Signals, and Circuits, 1998,1(1):11-55.[4]Villasenor J D, Belzer B, Liao J. Wavelet filter evaluation for image compression. IEEE Trans.on Image Processing, 1995, Preprint. ［6］Hilton M L, Jawerth B D, Sengupta A. Compressing still and moving images with wavelets.Multimedia Systems, 1994,2(3):218-227.[5]Popat A C. Scalar quantization with arithmetic coding: M. S. Thesis. Boslon: Department of Electrical Engineering, Massachusetts Institute of Technology,1990. -
计量
- 文章访问数: 2226
- HTML全文浏览量: 116
- PDF下载量: 467
- 被引次数: 0
下载:
