Fast and Effective Region-based Depth Map Upsampling with Application to Location Map-Free Reversible Data Hiding
Kuo-Liang Chung *
Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei, Taiwan 10672, R.O.C.
Yu-Ling Tseng
Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei, Taiwan 10672, R.O.C.
Tzu-Hsien Chan
Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei, Taiwan 10672, R.O.C.
Ching-Sheng Wang
Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei, Taiwan 10672, R.O.C.
*Author to whom correspondence should be addressed.
Abstract
In this paper, we rst propose a fast and eective region-based depth map upsampling method, and then propose a joint upsampling and location map-free reversible data hiding method, simpled called the JUR method. In the proposed upsampling method, all the missing depth pixels are partitioned into three disjoint regions: the homogeneous, semi-homogeneous, and non- homogeneous regions. Then, we propose the depth copying, mean value, and bicubic interpolation approaches to reconstruct the three kinds of missing depth pixels quickly, respectively. In the proposed JUR method, without any location map overhead, using the neighboring ground truth depth pixels of each missing depth pixel, achieving substantial quality, and embedding capacity merits. The comprehensive experiments have been carried out to not only justify the execution-time and quality merits of the upsampled depth maps by our upsampling method relative to the state-of-the-art methods, but also justify the embedding capacity and quality merits of our JUR method when compared with the state-of-the-art methods.
Keywords: Bicubic interpolation, color plus depth video coding, depth map upsampling, depth no-synthesis-error, quality, reversible data hiding.