tailieunhanh - Báo cáo hóa học: " Research Article Scalable Video Coding with Interlayer Signal Decorrelation Techniques"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Scalable Video Coding with Interlayer Signal Decorrelation Techniques | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 54342 15 pages doi 2007 54342 Research Article Scalable Video Coding with Interlayer Signal Decorrelation Techniques Wenxian Yang Gagan Rath and Christine Guillemot Institut de Recherche en Informatique et Systemes Aleatoires Institut National de Recherche en Informatique et en Automatique 35042 Rennes Cedex France Received 12 September 2006 Accepted 20 February 2007 Recommended by Chia-Wen Lin Scalability is one of the essential requirements in the compression of visual data for present-day multimedia communications and storage. The basic building block for providing the spatial scalability in the scalable video coding SVC standard is the well-known Laplacian pyramid LP . An LP achieves the multiscale representation of the video as a base-layer signal at lower resolution together with several enhancement-layer signals at successive higher resolutions. In this paper we propose to improve the coding performance of the enhancement layers through efficient interlayer decorrelation techniques. We first show that with nonbiorthogonal upsampling and downsampling filters the base layer and the enhancement layers are correlated. We investigate two structures to reduce this correlation. The first structure updates the base-layer signal by subtracting from it the low-frequency component of the enhancement layer signal. The second structure modifies the prediction in order that the low-frequency component in the new enhancement layer is diminished. The second structure is integrated in the JSVM codec with suitable modifications in the prediction modes. Experimental results with some standard test sequences demonstrate coding gains up to 1 dB for I pictures and up to dB for both I and P pictures. Copyright 2007 Wenxian Yang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use .