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For the new HEVC compression technology, the analysis of accumulation of quality losses in multi-generation coding is still an open problem. In this paper, we describe the results of extensive experiments that demonstrate quality loss accumulation in 300 encoding-decoding cycles using the HEVC codec in the All Intra mode. For consecutive encoding cycles with constant encoder configuration, the coding...
We deal with the processing of multiview video acquired by the use of practical thus relatively simple acquisition systems that have a limited number of cameras located around a scene on independent tripods. The real-camera locations are nearly arbitrary as it would be required in the real-world Free-Viewpoint Television systems. The appropriate test video sequences are also reported. We describe...
The paper deals with nonlinear two-dimensional filters for image restoration. The filter employs classic predictor structure with nonlinear predictor and prediction error processed by a static (memoryless) nonlinear element or by a nonlinear two-dimensional filter. The filters discussed are both recursive and nonrecursive. Even in the case of recursive structures stability is guaranteed. The filters...
The method presented in this paper uses motion information to complement the state-of-the-art depth estimation technique. The use of motion field correspondence between different views in the matching cost function for disparity computation is proposed. In addition, edges from motion maps are used to modify smoothing cost function in the algorithm in order to preserve sharp edges of moving objects...
In this paper we propose a new technique for refinement of depth maps. The technique exploits a stereoscopic pair of images and full-pixel precision disparity map in order to produce the output disparity map with sub-pixel precision. The technique employs view synthesis for verification of hypotheses on disparity values, which are formed to iteratively improve the disparity map. Results of experiments,...
The paper describes a technique for compression of a stereoscopic video pair together with the corresponding two depth maps. The proposed encoder produces a joint bit-stream for two viewpoint video sequences and two depth maps. Thus the headers with the control information is shared for all 4 video items. Moreover mutual correlation between these items is exploited by use of the multiview compression...
Firstly the paper reports experimental results proving that Cascaded Pixel Domain Transcoder (CPDT) is extremely inefficient when used for AVC/H.264 bitstream transcoding aimed at bitrate reduction not exceeding 30% of primary bitrate. In the paper, proposed is a transcoder that exploits structured truncation of bitsream and an algorithm for such truncation is described. The experimental results are...
For AVC/H.264 video encoders, the paper describes a simple global model that defines a relationship between the bitrate and the quantization step Qstep for I-, P- and B-frames. Proposed is a general model for any video shot. As such a model must be dependent on video content, the model parameters have to be estimated from experimental data individually for each video shot, and individually for each...
The paper deals with prospective 3D video transmission systems that would use compression of both multiview video and depth maps. The paper addresses the problem of quality of views synthesized from other views transmitted together with depth information. For the state-of-the-art depth map estimation and view synthesize techniques, the paper proves that AVC/SVC-based multiview video coding technique...
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