共查询到18条相似文献,搜索用时 140 毫秒
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在兼顾运动图像分割效果和实时性的原则上,针对视频会议、新闻播报等低比特率视频序列,提出了一种简单高效的运动对象分割算法。首先利用累积帧差求出图像帧的运动区域,然后对其进行二值化和形态学处理得到帧差模板,最后利用二次扫描的方法得到运动对象掩模,对其进行填充就可以提取出运动对象。实验证明得到了较好的分割效果并且在实时性的应用中具有一定的优势。 相似文献
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针对目前的视频运动对象分割中算法复杂度高、实时性差,分割不精确等问题,提出了一种基于时空结合的视频运动对象分割算法.该算法利用视频序列的时间相关性来进行对称差分处理,首先取得当前帧运动对象的大致轮廓区域;然后在轮廓区域内,用区域增长法对图象作空域分割;最后利用对称差分的分割结果排除空域分割结果中的背景区域来取得运动对象.实验结果表明,这种算法简单实用,不仅兼顾了实时性和精确性,而且能有效地分割出视频序列中的运动对象. 相似文献
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针对早期森林火灾烟雾图像序列,提出了一种基于时间-空间域联合的烟雾前景分割算法。首先,对烟雾的瞬时动态数据和累积动态数据进行分析,然后,进行二值化、形态学处理,得到了烟雾前景轮廓。通过扫描烟雾前景轮廓和填充烟雾前景掩模后即可得到烟雾前景图像。实验证明,该算法兼顾了分割效果和实时性,较好地对森林火灾烟雾进行了提取。 相似文献
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为了提高视频分割的实时性和效果,针对低比特率多媒体应用的视频序列,提出了一种简单快速的运动对象分割方法。首先利用对称差分得到差分图像,然后再求出当前帧的梯度图像,二者相与得到连续的运动对象边界;再对其进行形态学处理及二次扫描,得到运动对象掩模;最后用原图像的灰度值填充该区域。实验证明,使用该方法得到了较好的分割效果并缩短了处理时间。 相似文献
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基于时空背景差的运动目标检测算法 总被引:5,自引:0,他引:5
假定图像序列的背景图像已经获得,提出一种基于时空背景差的运动目标检测算法.该算法融合背景差分、基于时间信息的帧间差分及基于空间信息的背景差分信息,得到真实运动物体的运动种子点,认为背景差分图像中包含运动种子点的连通区域为真实的前景目标,从而可以检测出正确而完整的前景目标.仿真实验表明,该算法可以避免背景模型对场景的表征不足及背景更新阶段造成的错误检测,即使在场景中存在微小运动的复杂环境下,仍能实现准确的运动分割. 相似文献
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基于累积绝对差图像与交叉熵分割的运动目标检测与定位 总被引:1,自引:0,他引:1
提出了一种新的运动目标检测与定位方法。针对位移变化较小的运动目标,先对运动序列中所有相邻两帧图像作绝对值差分运算,然后再将绝对值差分结果进行累加,从而得到累积绝对差图像。利用交叉熵分割法对累积绝对差图像二值化,并结合形态学方法去除噪声,求取出目标的运动区域。对运动序列的首帧和尾帧进行差分运算并二值化.为了去噪,将首尾帧差图像与累积绝对差图像进行逻辑与运算,确定出目标在首尾图像中的位置。实验结果表明了本方法的有效性和鲁棒性。 相似文献
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Extracting moving targets from video accurately is of great significance in the field of intelligent transport.To some extent,it is related to video segmentation or matting.In this paper,we propose a non-interactive automatic segmentation method for extracting moving targets.First,the motion knowledge in video is detected with orthogonal Gaussian-Hermite moments and the Otsu algorithm,and the knowledge is treated as foreground seeds.Second,the background seeds are generated with distance transformation based on foreground seeds.Third,the foreground and background seeds are treated as extra constraints,and then a mask is generated using graph cuts methods or closed-form solutions.Comparison showed that the closed-form solution based on soft segmentation has a better performance and that the extra constraint has a larger impact on the result than other parameters.Experiments demonstrated that the proposed method can effectively extract moving targets from video in real time. 相似文献
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视频运动对象分割是计算机视觉和视频处理的基本问题。在摄像机存在全局运动的动态场景下,准确分割运动对象依然是难点和热点问题。本文提出一种基于全局运动补偿和核密度检测的动态场景下视频运动对象分割算法。首先,提出匹配加权的全局运动估计补偿算法,消除动态场景下背景运动对运动对象分割的影响;其次,采用非参数核密度估计方法分别估计各像素属于前景与背景的概率密度,通过比较属于前景和属于背景的概率及形态学处理得到运动对象分割结果。实验结果证明,该方法实现简单,有效地提高了动态场景下运动对象分割的准确性。 相似文献
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Wang Y Loe KF Wu JK 《IEEE transactions on pattern analysis and machine intelligence》2006,28(2):279-289
This paper proposes a dynamic conditional random field (DCRF) model for foreground object and moving shadow segmentation in indoor video scenes. Given an image sequence, temporal dependencies of consecutive segmentation fields and spatial dependencies within each segmentation field are unified by a dynamic probabilistic framework based on the conditional random field (CRF). An efficient approximate filtering algorithm is derived for the DCRF model to recursively estimate the segmentation field from the history of observed images. The foreground and shadow segmentation method integrates both intensity and gradient features. Moreover, models of background, shadow, and gradient information are updated adaptively for nonstationary background processes. Experimental results show that the proposed approach can accurately detect moving objects and their cast shadows even in monocular grayscale video sequences. 相似文献
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提出对差分图像用三层统计模型表示的思想:前景运动汽车层、背景运动汽车层和运动阴影层,并分别建立了各层的统计模型,应用HMM对运动图像序列进行模型参数估计,通过模型进行运动汽车分割。HMM利用图像序列帧之间的图像像素空间相关性和时间相关性,从而完成模型参数的识别。通过MAP算法完成模型参数具体化,不但用模型完成图像前景目标的分割,同时在分割中自然区别了背景运动目标和阴影,实现了复杂背景图像的运动汽车分割。实验结果表明方法能够有效地完成分割目的。 相似文献
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: This paper presents a motion segmentation method useful for representing efficiently a video shot as a static mosaic of
the background plus sequences of the objects moving in the foreground. This generates an MPEG-4 compliant, layered representation
useful for video coding, editing and indexing. First, a mosaic of the static background is computed by estimating the dominant motion of the scene. This is achieved by tracking features over the video sequence and using a robust technique that discards features
attached to the moving objects. The moving objects get removed in the final mosaic by computing the median of the grey levels.
Then, segmentation is obtained by taking the pixelwise difference between each frame of the original sequence and the mosaic
of the background. To discriminate between the moving object and noise, temporal coherence is exploited by tracking the object
in the binarised difference image sequence. The automatic computation of the mosaic and the segmentation procedure are illustrated
with real sequences experiments. Examples of coding and content-based manipulation are also shown.
Received: 31 August 2000, Received in revised form: 18 April 2001, Accepted: 20 July 2001 相似文献
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Multimedia Tools and Applications - Background subtraction is generally used for foreground segmentation (moving object detection) from video sequences. Several background subtraction methods have... 相似文献