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一种有效的基于运动矢量场的压缩域运动对象分割算法 总被引：1，自引：0，他引：1
In this paper an efficient compressed domain moving object segmentation algorithm is proposed, in which the motion vector (MV) field parsed from the compressed video is the only cue used for moving object segmentation. First the MV field is temporally and spatially normalized, and then accumulated by an iterative backward projection to enhance salient motions and alleviate noisy MVs. The accumulated MV field is then segmented into motion-homogenous regions using a modified statistical region growing approach. Finally, moving object regions are extracted in turn based on minimization of the joint prediction error using the estimated motion models of two region sets containing the candidate object region and other remaining regions, respectively. Experimental results on several H.264 compressed video sequences demonstrate good segmentation performance. 相似文献
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Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali... 相似文献
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Mobile devices are increasingly powerful in multimedia transmitting and browsing. However, the small screen and different
aspect ratios of mobile devices lower visual quality while watching images or videos. Video retargeting is aim at fitting
an existing video into arbitrary size and aspect ratio. Previous content-aware retargeting methods are mostly high computational
cost, which limits their applications on the portable devices with low computation ability. In this paper, a new crop-and-scale
approach is presented to adapt video to better suit the target display. We automatically find the optimal parameters of cropping
window using the dynamic programming method, and then scale it to fit the target display. The cropping window can smoothly
shift during a shot to follow the movement of important objects. The retargeting results using our approach introduce no deformation
and jitter effects over the whole video. Experimental results show the success of our approach on adapting a variety of source
videos to small display sizes. 相似文献
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Current multi-view video coding （MVC） reference model in joint video team （JVT） does not provide efficient rate control schemes. This paper presents a rate control algorithm for MVC by improving the quadratic rate-distortion （R-D） model. We reasonably allocate bit-rate among views based on the correlation analysisl The proposed algorithm consists of three levels to control the rate bits more accurately, of which the frame layer allocates bits according to the frame complexity and the temporal activity. Extensive experiments show that the proposed algorithm can control the bit rate efficiently. 相似文献
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The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged.However,due to synthesizing arbitrary view images,the virtual view images mostly have no reference images and are only assessed using non-reference.Virtual view images synthesized by depth estimation reference software (DERS) and view synthesis reference software (VSRS) often accompanied with blockiness and other distortions on the edge.In addition,matching level for the depth map ... 相似文献
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The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged.
However, due to synthesizing arbitrary view images, the virtual view images mostly have no reference images and are only assessed
using non-reference. Virtual view images synthesized by depth estimation reference software (DERS) and view synthesis reference
software (VSRS) often accompanied with blockiness and other distortions on the edge. In addition, matching level for the depth
map and the corresponding texture maps of left and right views also affects the quality of the virtual view. This paper compares
the edge similarity of the depth and the corresponding texture maps which generate the intermediate virtual view and combined
with the virtual view’s blockiness which causing blur to evaluate the quality of the virtual view. Experiment results show
that the proposed method can reflect the quality of the virtual view better. 相似文献
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We present an unequal decoding power allocation （UDPA） approach for minimization of the receiver power consumption subject to a given quality of service （QoS）, by exploiting data partitioning and turbo decoding. We assign unequal decoding power of forward error correction （FEC） to data partitions with different priority by jointly considering the source coding, channel coding and receiver power consumption. The proposed scheme is applied to H.264 video over additive white Gaussion noise （AWGN） channel, and achieves excellent tradeoff between video delivery quality and power consumption, and yields significant power saving compared with the conventional equal decoding power allocation （EDPA） approach in wireless video transmission. 相似文献
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This paper analyzes the technical characteristic of three-dimensional display technology (3DTV) system and some core technologies
yet to be solved. It points out the ways to solve these problems and presents an effective solution for the discomfort of
watching the three-dimensional TV. 相似文献
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