Arbitrarily shape object-based video coding technology by Wavelet-based Contourlet Transform
Zhenghua Shu, Yihang Luo, Guodong Liu, Zhihua Xie · 2015
Video object coding is one of the most important functionalities proposed by MPEG4. In this paper, a new Wavelet-based Contourlet Transform method to encode the texture of an arbitrarily shaped object is presented, which both for the still and for video object. The method uses the shape adaptive Wavelet-based Contourlet Transform (SA-WBCT) in MPEG4 still object coding, but with a computationally more efficient lifting implementation. The transformed object coefficients are then quantized and entropy encoded with a partial bitplane embedded coder, which greatly improves the coding efficiency. We denote the coding algorithm as video object Wavelet-based Contourlet Transform (VOWBCT) coder. The results show that the quality of the VOWBCT algorithm is significantly higher than the results of the VOW algorithm in the same bit rate in terms of PSNR. Moreover, This VOWBCT coding method is more convenient in realization.