Vector Lifting Schemes for Stereo Image Coding

Abstract

Abstract-Many research efforts have been devoted to the improvement of stereo image coding techniques for storage or transmission. In this paper, we are mainly interested in lossyto-lossless coding schemes for stereo images allowing progressive reconstruction. The most commonly used approaches for stereo compression are based on disparity compensation techniques. The basic principle involved in this technique first consists of estimating the disparity map. Then, one image is considered as a reference and the other is predicted in order to generate a residual image. In this work, we propose a novel approach, based on Vector Lifting Schemes (VLS), which offers the advantage of generating two compact multiresolution representations of the left and the right views. We present two versions of this new scheme. A theoretical analysis of the performance of the considered VLS is also conducted. Experimental results indicate a significant improvement using the proposed structures compared with conventional methods.

Dense disparity map representations for stereo image coding

“…Recently, we have proposed a new joint coding scheme for stereo pairs using a VLS [12]. In fact, instead of coding the reference image and the residual one, our approach is based on a joint multiscale decomposition of the left and the right image.…”

“…For instance, some methods make use of the discrete cosine transform [8,9], and to meet the scalability requirement, more recent works have retained the wavelet transform [10,11]. Recently, we have proposed a novel approach based on the Vector Lifting Schemes (VLS), that directly generates two compact multiresolution representations of the left and right images instead of a residual image [12]. Inspired by the works in video coding, the disparity field was estimated based on a block-matching technique.…”

“…However, the classical block-based technique does not always guarantee a consistent disparity map. In this paper, we propose to perform the joint coding of the stereo pair using the VLS developed in [12] along with the Dense DE (DDE) method described in [15,16]. We have retained such DE method because it achieves good results compared with the state-ofthe-art methods, such as dynamic programming [17] and graph cuts [18].…”

Non-separable lifting scheme with adaptive update step for still and stereo image coding

“…It is worth noting that a separable LS may not appear very efficient to cope with the two-dimensional characteristics of edges which are neither horizontal nor vertical [8]. In addition to monocular images, LS have been extensively used for stereo image coding [9,10]. Indeed, most of the existing works rely on disparity compensation techniques due to their similarity with the motion compensation techniques which are popular for video coding [11].…”

Two-dimensional non separable adaptive lifting scheme for still and stereo image coding

“…Furthermore, separable LS is not efficient to cope with characteristics of edges which are neither horizontal nor vertical. In addition to still monocular images, LS have been extensively used for stereo image coding [7,8]. Indeed, it can be noticed that most of the existing works rely on disparity compensation techniques.…”