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DES中一种新的搜索密钥空间的方法 被引量:4
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作者 崔国华 《电子学报》 EI CAS CSCD 北大核心 1991年第5期75-80,共6页
本文根据DES中生成内部密钥的左移次数,给出了一种搜索密钥空间的新方法。就搜索时间来看,此方法把密钥空间的大小由2^(56)下降到2^(54)。
关键词 通信 DES 密阴空间 搜索
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Multimodal background model with noise and shadow suppression for moving object detection 被引量:1
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作者 毛燕芬 施鹏飞 《Journal of Southeast University(English Edition)》 EI CAS 2004年第4期423-426,共4页
A statistical multimodal background model was described for moving object detection in video surveillance. The solution to some of the problems such as illumination changes, initialization of model with moving objects... A statistical multimodal background model was described for moving object detection in video surveillance. The solution to some of the problems such as illumination changes, initialization of model with moving objects, and shadows suppression was provided. The background samples were chosen by thresholding inter-frame differences, and the Gaussian kernel density estimation was used to estimate the probability density function of background intensity. Pixel's neighbor information was considered to remove noise due to camera jitter and small motion in the scene. The hue-max-min-diff color information was used to detect and suppress moving cast shadows. The effectiveness of the proposed method in the foreground segmentation was demonstrated in the traffic surveillance application. 展开更多
关键词 Gaussian noise (electronic) Image segmentation Space surveillance Tracking (position) Traffic control Video cameras
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