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针对隔行视频,提出了一种新的运动自适应去隔行算法,该算法能充分利用图像序列时间和空间上的相关信息,采用新颖的运动检测方法区分视频序列中的运动和静止部分.对于运动部分,使用新的自适应插值算法;对于静止部分,采用行复制算法进行处理.实验表明,该算法与一些传统的去隔行算法相比,在画面视觉效果上,能达到更好的效果. 相似文献
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在分析了现有各种去隔行算法的基础上,提出了一种新型的运动自适应去隔行算法。该算法通过对传统运动检测算法的改进,提高了运动检测的精度,降低了误判的概率,可高效地区分图像的静止和运动部分,然后采用不同的算法进行去隔行,同时对运动部分采用的插值算法进行了改进,新的插值算法综合了帧内行平均算法和边缘算法的优点,插值效果有很大改善,最后给出了FPGA实现原理。实验结果表明,本文算法无论对运动图像还是对静止图像都具有很好的去隔行效果,在一定程度上弥补了传统去隔行算法边缘不够平滑,出现锯齿,细节模糊,甚至有断点、虚像等缺点。同时,算法也很好地实现了显示品质和硬件成本之间的平衡,适合应用于中端视频产品及在FPGA设计中的应用。 相似文献
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去隔行算法是电视扫描格式转换和数字视频处理的一项关键技术.本文分析了现有的各种去隔行算法,在此基础上,采用了一种运动自适应去隔行算法.该算法通过运动检测将图像中的像素进行分类,针对不同类型的像素点自适应的采取不同的插值算法,提高了图像的质量.同时与基于块匹配的运动补偿去隔行算法相比,易于硬件实现. 相似文献
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提出了一种基于运动检测的去隔行算法。其原理是通过4场水平运动检测和场内插检测,将图像分为静止和运动两部分,并采用前场值和场内插值进行去隔行。文中的算法在FPGA上得以实现,并将结果在VGA上进行显示。通过观察去隔行图像,得知该方法能较好地消除模糊、锯齿等不良现象,获得了较为理想的效果 相似文献
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用于视频对象平面生成的运动对象自动分割 总被引:1,自引:0,他引:1
新的视频编码标准MPEG-4具有基于内容的功能。它把图像序列分解成视频对象平面(VOP),每个VOP代表一个运动对象。文中提出了一种提取运动对象的新的视频序列分割算法,算法的核心是一个对象跟踪器,它利用Hausdorff距离将对象的二维二值模型与后续帧进行匹配,然后采用一种新的基于运动相连成分的模型刷新方法对模型的每一帧进行刷新。初始的模型自动产生,再利用滤波技术滤除静止背景,最后,利用二值模型从序列中提取出VOP。 相似文献
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全局运动信息在视频分析中起着重要的作用.本文根据MPEG编码特点,提出了一种从MPEG压缩域中快速有效地进行全局运动参数估计的算法.该算法充分利用了MPEG压缩码流中的信息,通过提取预测残差DC图像的运动背景区域,估计全局运动参数,从而保证了参数估计的准确性,有效地克服了已有文献中仅仅采用运动矢量进行全局运动估计的局限性.根据不同的MPEG测试序列的对比分析,结果表明,本算法可快速准确地对MPEG视频序列进行全局运动信息估计,同时具有很高的鲁棒性. 相似文献
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一种解决波动式干扰影响的序列图像运动目标检测方法 总被引:1,自引:0,他引:1
为解决复杂环境下的诸如枝叶摇摆、摄像机抖动等波动式干扰对运动目标检测的影响问题,该文提出基于视频窗口切分与分类的序列图像运动目标检测算法。首先将序列图像切分为rc大小的视频窗口,然后提取窗口内区域图像累积帧间差矩阵的简单统计特征,针对每一帧序列图像,将视频窗口进行分类,把它们划分为运动目标窗口和非运动目标窗口(包括静止背景窗口和波动式干扰窗口),最后将运动目标窗口合并为运动目标。该方法的优点是无需已知背景模型和运动目标大小、形状等任何先验信息。实验表明该算法能在摄像机抖动以及枝叶干扰等复杂环境下快速有效的检测出运动目标。 相似文献
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基于多个非刚体目标跟踪的视频对象平面生成算法 总被引:1,自引:0,他引:1
提出了一种提取运动对象的新的视频序列分割算法。算法的核心是一个对象跟踪器,它利用一种基于对象行为的跟踪算法对多个非刚体目标有效地进行对象跟踪,并与后续帧进行匹配,然后采用一种基于运动相连成分的模型刷新方法对模型的每一帧进行刷新,初始的模型自动产生,再利用滤波技术滤除静止背景,最后,利用边界图像模型从序列中提取出视频对象平面(VOP)。 相似文献
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The authors propose a new image sequence coding algorithm based on two crucial methods: quadtree segmentation and classified vector quantisation (CVQ). Overall coding rates are efficiently lowered by quadtree segmentation while visual quality is well preserved by a CVQ method. A moving-block extraction technique is employed to greatly improve the coding efficiency in the interframe coding mode. A quadtree efficiently segments the stationary background regions of interframe differential signals with various large-sized blocks, and the moving regions are extracted from the smallest blocks of 4×4 size during the growth of the quadtree. These moving regions are motion-compensated using a block-matching method based on 4×4 blocks and the residual signals of the motion-compensated moving regions are coded by CVQ. The stationary regions are simply replenished from the previous frame. The proposed coding scheme is effective for coding the sequential signals of video telephony or video conferencing at low bit rates 相似文献
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Issues such as content identification, document and image security, audience measurement, ownership and copyright among others can be settled by the use of digital watermarking. Many recent video watermarking methods show drops in visual quality of the sequences. The present work addresses the aforementioned issue by introducing a robust and imperceptible non-blind color video frame watermarking algorithm. The method divides frames into moving and non-moving parts. The non-moving part of each color channel is processed separately using a block-based watermarking scheme. Blocks with an entropy lower than the average entropy of all blocks are subject to a further process for embedding the watermark image. Finally a watermarked frame is generated by adding moving parts to it. Several signal processing attacks are applied to each watermarked frame in order to perform experiments and are compared with some recent algorithms. Experimental results show that the proposed scheme is imperceptible and robust against common signal processing attacks. 相似文献
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A self-organizing approach to background subtraction for visual surveillance applications. 总被引:15,自引:0,他引:15
Detection of moving objects in video streams is the first relevant step of information extraction in many computer vision applications. Aside from the intrinsic usefulness of being able to segment video streams into moving and background components, detecting moving objects provides a focus of attention for recognition, classification, and activity analysis, making these later steps more efficient. We propose an approach based on self organization through artificial neural networks, widely applied in human image processing systems and more generally in cognitive science. The proposed approach can handle scenes containing moving backgrounds, gradual illumination variations and camouflage, has no bootstrapping limitations, can include into the background model shadows cast by moving objects, and achieves robust detection for different types of videos taken with stationary cameras. We compare our method with other modeling techniques and report experimental results, both in terms of detection accuracy and in terms of processing speed, for color video sequences that represent typical situations critical for video surveillance systems. 相似文献
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