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Currently, depth sequences generated by automatic depth estimation suffer from the temporal inconsistency problem. Estimated depth values of some objects vary in adjacent frames, whereas the objects actually remain on the same depth planes. These temporal depth errors significantly impair the visual quality of the synthesized virtual view as well as the coding efficiency of the depth sequences. Since...
During view synthesis based on depth maps, also known as Depth-Image-Based Rendering (DIBR), annoying artifacts are often generated around foreground objects, yielding the visual effects that slim silhouettes of foreground objects are scattered into the background. The artifacts are referred as the boundary noises. We investigate the cause of boundary noises, and find out that they result from the...
AVS-Part 2 is a mainstream video coding standard with high compression efficiency similar to H.264/AVC. A technique named Second Order Prediction (SOP) has been presented based on H.264/AVC to decrease the signal correlation after motion-compensated prediction. To achieve better coding performance, this paper presents a method named Block-based Second Order Prediction (BSOP) to ameliorate SOP to adapt...
In this paper, a novel spatial prediction method is proposed to improve prediction accuracy and capture the dynamics of different video contents. The method adaptively generates optimized spatial prediction modes according to the local feature of coded image. The optimization is conducted by analytical calculations to minimize the energy of prediction residue. Experimental results show that the method...
Based on a relatively simple motion assumption, the technique of motion-compensated prediction will result in large residue when dealing with video contents containing complex motions. To achieve higher coding efficiency, this paper presents a method named second order prediction (SOP) to exploit remaining signal correlation after motion-compensated prediction. Demonstration and analysis on the SOP...
This demonstration shows that the RVC framework offers a great flexibility in selecting coding tools for decoder reconfigurations to satisfy a wide variety of different applications by showing a hybrid decoder reconfiguration using coding tools from MPEG and AVS Video Tool Library (VTL). Compared with the original MPEG-4 simple profile (SP), complexity of the reconfigured decoder is reduced whereas...
An improved intraframe rate-quantization(R-Q) model for H.264/AVC video coding is proposed in this paper. Based on this R-Q model, a frame layer bit number prediction method is derived. The proposed method can be applied in rate control to select accurate quantization parameters (QP) for intraframe according to the target bitrate, especially when multipass coding is permitted to get a refined bit...
Multimedia devices are now required to support multiple coding standards. Supporting seamlessly both interoperability between standards and flexibility for application specific optimizations is a great challenge for current video coding technology. After a brief description of the new MPEG reconfigurable video coding (RVC) framework, this paper describes possible decoder reconfigurations within this...
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