共查询到18条相似文献,搜索用时 174 毫秒
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针对视频分析中难以完全将前景(FG)和运动阴影正确分离,提出一种基于阴影HSV颜色空间特性与Gabor筛选器的阴影分割方法。首先,采用一种基于复杂背景(BG)的运动目标检测方法提取出运动目标;其次,采用基于HSV颜色空间阴影特性初步判定阴影区域;最后,设计基于感兴趣区域(ROI,region of interest)的Gabor筛选器对初步判定后的阴影区域进行筛选,从而检测出阴影。对不同光照和环境条件下的视频序列进行测试结果表明,方法效果好,阴影检测率高,可应用于智能视频监控的目标检测。 相似文献
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针对室内视频监控中运动目标检测常出现的阴影误检,提出了一种基于颜色空间转换的自适应背景建模和阴影消除算法.在RGB空间采用自适应背景差对视频图像进行前景背景分离,并将检测出的前景目标锁定在活动轮廓矩形框内进行目标跟踪,对于误检的虚假目标(即阴影),利用其亮度等信息,在HSV空间去除.经实验验证,该算法对阴影的去除有良好的效果,能准确检测出真实目标. 相似文献
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针对传统HSV空间阴影去除模型中阈值难以确定、计算复杂及检测效率较低等问题,在对传统运动目标阴影去除算法进行深入研究的基础上,首先融入一阶梯度信息对传统HSV空间阴影去除模型的不足之处进行针对性改进,然后在此基础上融入反射比不变量提出了一种多信息融合的视频运动目标阴影去除算法.该算法在改进HSV空间阴影去除算法的基础上,进一步引入阴影候选像素及其对应背景区域像素的反射比不变特性来实现阴影区域更为精确的检测,从而有效区分并去除运动目标的阴影像素.实验结果表明,该算法在实际应用中具有较高的有效性和通用性. 相似文献
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背景图像的提取和更新是背景差分的关键。传统的背景差分法是对灰度图像进行处理,在检测前要对彩色图像进行颜色空间的转换,必然会丢失许多信息。对时间中值获取背景模型的不足加以改进,设计并实现了一种基于RGB三通道分离的运动目标检测方法。用形态学处理和连通性分析消除噪声,用区域填充技术填充目标区域内部空洞,在HSV空间去除阴影部分,得到比较准确的运动目标。实验结果表明,该算法在运动目标存在的情况下也能获得较准确的背景模型,当目标灰度值和背景灰度相近的时候,也可以检测到较完整的运动对象。 相似文献
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主要研究视频监控系统中运动目标检测算法,提出一种背景差分与帧间差分相融合的方法。该算法通过多次差分以及判决区域的相关运算划定背景区域和运动区域。同时参考相邻帧平均灰度信息更新背景帧以适应光线变化对判断造成的影响。在图像后处理中结合相关形态学算划分最终的运动目标。该算法可实现运动目标的快速准确定位和区域估算,实验表明该算法的时间复杂度和空间复杂度低,效果良好。 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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针对传统混合高斯模型使用固定学习速率所带来的问题,提出了一种改进的运动目标检测算法。该算法采用自适应的学习速率调整策略,在背景建模初期,采用较大的学习速率加快初始背景的建模,使得模型能更快地适应背景的变化;背景形成以后,根据目标运动的快慢动态调整学习速率,从而能够及时更新背景,消除运动目标的残留和拖影;最后利用基于HSV颜色空间的阴影检测算法消除运动阴影。实验结果表明,改进算法优于传统混合高斯模型,可以更准确地检测出运动目标,更好地消除阴影,并具有较好的自适应性和稳健性。 相似文献
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Wu-Chih Hu Chao-Ho Chen 《Journal of Visual Communication and Image Representation》2012,23(2):303-312
A scheme based on a difference scheme using object structures and color analysis is proposed for video object segmentation in rainy situations. Since shadows and color reflections on the wet ground pose problems for conventional video object segmentation, the proposed method combines the background construction-based video object segmentation and the foreground extraction-based video object segmentation where pixels in both the foreground and background from a video sequence are separated using histogram-based change detection from which the background can be constructed and detection of the initial moving object masks based on a frame difference mask and a background subtraction mask can be further used to obtain coarse object regions. Shadow regions and color-reflection regions on the wet ground are removed from the initial moving object masks via a diamond window mask and color analysis of the moving object. Finally, the boundary of the moving object is refined using connected component labeling and morphological operations. Experimental results show that the proposed method performs well for video object segmentation in rainy situations. 相似文献
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针对固定摄像机条件下的视频监控问题,提出了一种基于背景相减法和混合差分法相结合的运动目标检测算法。该方法对彩色图像建立混合高斯模型,对背景模型进行实时更新;并对帧间差分法进行了改进,提出混合差分的思想。通过背景相减法和混合差分法的结合,采用形态学滤波的方法去除噪声点,检测到确切的运动目标。实验结果证明,文中提出的算法能准确地建立背景模型,既完整地提取运动目标,又适应复杂环境的变化,提高了运动目标检测的精确度和速度。 相似文献
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《Journal of Visual Communication and Image Representation》2014,25(5):978-993
In this paper, we propose an adaptive and accurate moving cast shadow detection method employing online sub-scene shadow modeling and object inner-edges analysis for applications of static-camera video surveillance. To describe shadow appearance more accurately, the proposed method builds adaptive online shadow models for sub-scenes with different conditions of irradiance and reflectance. The online shadow models are learned by utilizing Gaussian functions to fit the significant peaks of accumulating histograms, which are calculated from Hue, Saturation and Intensity (HSI) difference of moving objects between background and foreground. Additionally, object inner-edges analysis is adopted to reject camouflages, which are misclassified foreground regions that are highly similar to shadows. Finally, the main shadow regions are expanded to recycle the misclassified shadow pixels based on local color constancy. The proposed algorithm can adaptively handle the shadow appearance changes and camouflages without prior information about illuminations and scenarios. Experimental results demonstrate that the proposed method outperforms state-of-the-art methods. 相似文献
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This paper proposes a mobile video surveillance system consisting of intelligent video analysis and mobile communication networking. This multilevel distillation approach helps mobile users monitor tremendous surveillance videos on demand through video streaming over mobile communication networks. The intelligent video analysis includes moving object detection/tracking and key frame selection which can browse useful video clips. The communication networking services, comprising video transcoding, multimedia messaging, and mobile video streaming, transmit surveillance information into mobile appliances. Moving object detection is achieved by background subtraction and particle filter tracking. Key frame selection, which aims to deliver an alarm to a mobile client using multimedia messaging service accompanied with an extracted clear frame, is reached by devising a weighted importance criterion considering object clarity and face appearance. Besides, a spatial-domain cascaded transcoder is developed to convert the filtered image sequence of detected objects into the mobile video streaming format. Experimental results show that the system can successfully detect all events of moving objects for a complex surveillance scene, choose very appropriate key frames for users, and transcode the images with a high power signal-to-noise ratio (PSNR). 相似文献