Shareability-Exclusivity Representation on Product Grassmann Manifolds for Multi-camera video clustering

With the rapid popularity of multi-camera networks, one human action is usually captured by multiple cameras located at different angles simultaneously. Multi-camera videos contain the distinct perspectives of one action, therefore multiple views can overcome the impacts of illumination and occlusion. In this paper, we propose a novel multi-camera video clustering model, named Shareability-Exclusivity Representation on Product Grassmann Manifolds (PGM-SER), to address two key issues in traditional multi-view clustering methods (MVC): (1) Most MVC methods directly construct a shared similarity matrix by fusing multi-view data or their corresponding similarity matrices, which ignores the exclusive information in each view; (2) Most MVC methods are designed for multi-view vectorial data, which cannot handle the nonlinear manifold structure hidden in multi-camera videos. The proposed PGM-SER firstly adopts Product Grassmann Manifolds to represent multi-camera videos, then simultaneously learn their shared and exclusive information in global structures to achieve multi-camera video clustering. We provide an effective optimization algorithm to solve PGM-SER and present the corresponding convergence analysis. Finally, PGM-SER is tested on three multi-camera human action video datasets and obtain satisfied experimental results.     

智能发光二极管照明控制系统设计

为了提高发光二极管（LED）照明系统的智能化程度,介绍了一个以1pc2103为控制核心的设计方案。系统由主控制器和单元控制器构成,热释电红外传感器检测的人体移动信号,与光敏电阻检测的环境光强度信号送入PIC16F628a单片机,实现移动人体和环境光照强度检测。采用PT4115芯片,实现LED光源恒流驱动,运用脉冲宽度调制调光方式,使光照强度保持稳定,从而实现对LED照明的智能化控制。实验结果充分证明了系统方案的可行性、高效性和稳定性。     

基于单目双焦及SIFT特征匹配的深度估计方法

提出一种基于单目双焦及SIFT特征匹配的深度估计方法.根据空间景物的深度在不同焦距下其成像的矢量位置和对应的焦距形成几何关系的原理,通过单相机获取两幅不同焦距下的图像后,运用SIFT算法对两幅图像进行特征提取和特征匹配,得出同一景物像素点距中心点的偏移位置比,从而通过几何关系公式计算出像素点的深度值,以此获取深度图.经实验验证了该方法的可行性,实验结果表明,使用该方法获取深度值仅需单台相机这一设备,方法简单易行,且成本低,具有广阔的应用范围.     

H.264压缩域中mean-shift聚类运动目标分割算法

针对视频监控、检索,提出了一 种在H.264压缩域下运动对象分 割的新算法。根据实际监控应用特点,算法主要利用H.264码流中提 取的运动矢量(MV)、分块尺寸信息对原始的MV场(MVF)进 行可靠性分析以及空间滤波、mean-shift聚类处理,从而得到可信度较高的 MVF场。首先,从H.264码流中获取原 始MV 并进行归一化处理,同时对原始MVF进行两步空间滤波;其次,对不同的块大 小分配相应的权值作为每个样本 的权重系数,将处理之后的MVF作为样本空间,利用mean-shift聚类获取 真实的MVF;最后,根据可靠的MVF 标记运动目标。实验结果表明,本文提出的mean-shift聚类运动目标分割算 法可以获得有效并可靠的分割结果。     

视频处理在智能交通中的应用现状及发展趋势

视频处理作为智能交通中的关键技术,对智能交通系统的性能起着至关重要的作用.对视频处理在智能交通中的应用现状进行了介绍,指出视频处理在智能交通中应用面临的主要问题并对智能交通中视频处理的发展趋势做出了展望.     

Parallel spatial-temporal convolutional neural networks for anomaly detection and location in crowded scenes

Anomaly detection and location in crowded scenes have attracted a lot of attention in computer vision research community recently due to the increased applications of intelligent surveillance improve security in public. We propose a novel parallel spatial-temporal convolution neural networks model to detect and localize the abnormal behavior in video surveillance. Our approach contains two main steps. Firstly, considering the typical position of camera and the large number of background information, we introduce a novel spatial-temporal cuboid of interest detection method with varied-size cell structure and optical flow algorithm. Then, we use the parallel 3D convolution neural networks to describe the same behavior in different temporal-lengths. That step ensures that the most of behavior information in cuboids could be captured, also insures the reduction of information unrelated to the major behavior. The evaluation results on benchmark datasets show the superiority of our method compared to the state-of-the-art methods.     

基于运动矢量统计的同步视频水印算法

通过分析运动矢量的数据统计特性,提出一种基于统计的抗同步攻击视频水印算法.该算法水印信息表示空间与数据特性紧密联系,具有物理空间、时间不可划分性,克服了传统水印算法的检测器对水印同步的依赖性.实验表明,该算法具有很好的鲁棒性和不可感知性,能够抵抗帧删除等同步攻击以及基于视频内容的攻击;在帧删除率小于18%时,水印正确率大于80%.     

基于GPRS的远程视频监控系统设计

介绍基于GPRS的远程视频监控系统的整体框架及其各组成部件的功能,论述了该系统的设计思路和关键技术,并给出系统主要部件的硬软件实现.     

基于小波变换的视频编码算法分类研究

在视频通信中,视频编码技术不但要有高的编码效率而且其生成的码流要有多种可伸缩性.在此研究领域.涌现出许多新的编码思想和技术,其中基于小波变换的视频编码算法就是很有发晨前景的技术之一.本文对小波变换视频编码算法进行分类研究.对比分析算法各自的优缺点,指出小波视频编码算法的研究方向.     

一种基于DSP和FPGA的图像处理系统

设计了一种以FPGA为数据采集逻辑控制单元,以DSP为高端图像处理单元的数字图像处理系统。介绍了该系统的硬件组成、工作原理。从视频编码单元、图像处理单元和视频输出单元对整个系统的构成和设计进行了描述,分析了系统设计时的各个关键技术环节。