基于视频对象交互的IPTV寻址技术设计

针对低阶Markov随机场(MRF)模型不能很好刻画视频帧结构的问题,在MRF中引入了二维Wold分解技术.将该技术应用在IPTV智能图像寻址中,并取得了较好的实验结果.最后,讨论了对寻址系统进行的电信级设计概要.     

一个大型网络视频监控系统解决方案

分析了一个大型视频监控系统的需求,提出了一种适用于该系统的解决方案,并给出了该方案的设计思路和实现,实证明,该方案具有良好的性能及广阔的应用前景.     

视频服务器播出系统设计

介绍了县市级电视台视频服务器播出系统的设计思路,并以江都电视台的具体实践为例提出规划方案,列出了设计系统的主要原则和技术要求,介绍了构建系统时需注意的问题.     

IPTV交互式寻址广告技术的探讨

IPTV业务的特性和新的商业模式一直是电信运营商研究的方向.IPTV业务能否进入规模发展期,影响其的关键因素是增值业务的实用性.本文通过利用智能图像寻址广告技术来改变传统的IPTV EPG的非实时交互模式,实现IPYV帧内对象提取,使用户与感兴趣的视频对象能进行即时的交互;通过视频对象对应的详细内容提示、弹出的购买界面、超链接等,实现实时的交互式购买支付,满足冲动消费.文中提出的寻址广告技术是未来IPTV一种较好的业务,充分体现了IPTV交互性.本文对寻址系统进行了电信级的系统设计与实现,并提出了实现的难点与建议.     

Object-based Super Resolution for intelligent visual surveillance video

Construction of high resolution images from low resolution sequences is often important in surveillance applications. In this letter, an affine based multi-scale block-matching image registration algorithm is first proposed. The images to be registered are divided into overlapped blocks of different size according to its motions. The Least Square （LS） image registration algorithm is extended to match the blocks. Then an object based Super Resolution （SR） scheme is designed, the Maximum A Priori （MAP） super resolution algorithm is extended to enhance the resolution of the interest objects. Experimental results show that the proposed multi-scale registration method provides more accurate registration between frames. Further more, the object based super resolution scheme shows an enhanced performance compared with the traditional MAP method.     

FASSVid: Fast and Accurate Semantic Segmentation for Video Sequences

Most of the methods for real-time semantic segmentation do not take into account temporal information when working with video sequences. This is counter-intuitive in real-world scenarios where the main application of such methods is, precisely, being able to process frame sequences as quickly and accurately as possible. In this paper, we address this problem by exploiting the temporal information provided by previous frames of the video stream. Our method leverages a previous input frame as well as the previous output of the network to enhance the prediction accuracy of the current input frame. We develop a module that obtains feature maps rich in change information. Additionally, we incorporate the previous output of the network into all the decoder stages as a way of increasing the attention given to relevant features. Finally, to properly train and evaluate our methods, we introduce CityscapesVid, a dataset specifically designed to benchmark semantic video segmentation networks. Our proposed network, entitled FASSVid improves the mIoU accuracy performance over a standard non-sequential baseline model. Moreover, FASSVid obtains state-of-the-art inference speed and competitive mIoU results compared to other state-of-the-art lightweight networks, with significantly lower number of computations. Specifically, we obtain 71% of mIoU in our CityscapesVid dataset, running at 114.9 FPS on a single NVIDIA GTX 1080Ti and 31 FPS on the NVIDIA Jetson Nano embedded board with images of size 1024×2048 and 512×1024, respectively.     

广角镜头图像畸变校正系统的研究

介绍了一种广角镜头图像畸变的实时校正系统。通过对光学系统畸变原理的分析,采用一定的算法对像素空间的位置进行几何变换,减少了由镜头大视场带来的几何畸变。整个系统以FPGA为核心控制器件,结合数字图像编码解码芯片和SDRAM存储器,可实现视频图像的实时校正。时钟倍频器在系统中可以为SDRAM及其控制模块提供与其它时钟同相位的高频时钟。     

视频荧光光谱图像技术鉴别复印纸

为建立使用视频荧光光谱图像技术检验不同品牌、型号复印纸的分析方法,实现对复印纸的检验和鉴别,收集了不同品牌和型号的静电复印纸20种,利用VSC6000视频光谱比较仪对其进行检验,获得样本的荧光图像,结合图像处理技术对荧光形态、荧光强度等进行可视化和量化分析。依据紫外光、强光源工作条件下纸张样品的视频荧光现象的形态学特征可对纸张进行初步鉴别;通过绘制视频荧光图像的等高线分布图可实现对纸张样品的可视化分析;计算荧光图像亮度值L可对纸张样品进行量化检验。研究结果表明,视频荧光光谱图像技术能够对复印纸进行准确、有效的检验,该方法适用于文件物质材料检验,为纸张的鉴别、比对和同一认定提供了一种实用方法。     

基于NIOSⅡ的视频叠加电路设计与实现

介绍基于NIOSⅡ嵌入式视频叠加电路的设计与实现。嵌入式NIOSⅡCPU控制电路接收矢量视频信号及标准PAL制视频信号,使其相叠加后存储于双端口RAM．上位机通过PXI总线接口将双端口RAM中数字视频信号采集至内存,并通过软件将叠加后的视频信息回放。实验证明,该电路能有效完成视频叠加,并成功应用于某测试系统。     

基于视觉感知的3D-HEVC帧间信息隐藏算法

由于传统的视频信息隐藏算法缺乏对人眼视觉感 知特性的研究,本文提出一种基于视觉感知 的3D-HEVC(3D High Efficiency Video Coding,3D-HEVC)帧间信息隐藏算法。首先,根 据立体显 著模型和大津阈值,将立体视频图像分为显著区域和非显著区域;然后,建立隐秘信息与量 化参数 QP(Quantization Parameter,QP)的映射关系,且针对不同的区 域,利用隐秘信息根据余数相等原 则相应的调制P帧或B帧的QP值;最后,用含隐秘信息的QP进行编码。实验结果表明,该 算法 平均每帧嵌入容量为246bit,相比于原始HTM13.0,所提算法编码重建立体视频序列的PSNR 值和SSIM值平均下降0.031dB和 0.000058,比特率仅平均增长0.0741%,且能对隐秘信息盲提取。