高清数字摄像机的硬件设计

以TI公司的TMS320DM6467为核心芯片,200万像素的高清摄像头作为视频采集源,设计了一种高清的数字摄像机,该摄像机搭配一套完整的后台服务系统可以组成一套很好的数字视频监控系统.本文就所设计的摄像机的硬件部分进行介绍,并对设计中的重点进行了分析.     

数字高清视频传输与视频接口的转换设计研究

数字高清视频在人们的日常生活中随处可见,为人们生活带来了很多便利。但数字高清视频传输系统成本极高,而且近年来又受到交互式网络电视的威胁,其存在与发展已岌岌可危。因此,更新高清视频传输系统以降低生产成本,并保住"高清"这一视点,提高高清视频质量,是极为必要的。本文就数字高清视频传输与视频接口的转换设计做了浅显研究,以求为高清视频发展做点贡献。     

无人机H.265双路视频传输系统的设计与实现

针对无人机视频传输设备接口兼容能力差、编码速率高的现状,设计了兼容高清多媒体接口(High Definition Multimedia Interface,HDMI)、串行数字接口(Serial Digital Interface,SDI)、复合同步视频广播信号(Composite Video Broadcast Signal,CVBS)三种接口的低码率视频传输系统。系统以Hi3519为核心,采用H. 265的方式编码。在接口兼容方面,通过搭配不同的视频接口芯片,兼容多种视频输入接口;在编码效率方面,同时压缩两路1080p60视频仅需3. 2 Mb/s的压缩码率。相比采用H. 264编码方式、需要视频接口转换器的方案,采用一片主处理器和多种视频接口芯片的方案具有低成本、低功耗、小体积的优点,更适用于无人机。通过搭建无线链路测试了系统的视频传输性能,结果表明,系统连接可靠、易于操作,可以实现实时、稳定的传输。     

基于TMS320DM6467的高清晰视频接口的硬件设计

以TI公司基于达芬奇技术的媒体处理器TMS320DM6467作为核心处理器。该设计根据TMS320DM6467内部的高清模块与VPIF视频接口,采用高清视频解码器TVP7002与高清/标清视频编码器ADV7343,设计出了高清视频信号的输入与输出系统,实现了对高清视频的监控与采集。     

轨道交通乘客信息系统中HDMI网络分配器的应用

在轨道交通乘客信息系统的实施过程中,针对乘客信息系统视频分配与传输环节的特殊环境,为了提升原有系统的抗干扰特性,将HDMI高清视频传输应用到乘客信息系统中.通过对HDMI高清数字信号进行压缩和降频,使HDMI信号的传输距离提升至百米级,同时在满足以太网网络带宽的提前下,保证了视频图像的清晰度,此外,同侧拉手传递的显示方案采用“无源通过”技术,从而保证了单点故障不扩散,该设计目前已在武汉轨道交通三号线投入使用,系统可靠、稳定.     

基于DisplayPort接口的高清视频传输方案

介绍了安防市场现有高清视频传输方案的缺陷,提出了一种基于DisplayPort接口改进的新的高清视频传输方案。详述了该技术的要点和实现方法。经过演示板卡的测试,证明该设计是切实可行的,可以为安防监控领域提供一种实时、无损、不限格式的视频传输方案。     

基于Spartan-6的高清视频传输系统

针对现有高清视频传输系统的不足,介绍了一种基于Spartan-6的高清视频传输系统。该系统利用其内置的高速串行接口和存储器控制接口硬核可将高清视频信号通过光纤无损失传输数十千米。较之传统传输方案,该方法不会损失图像质量,还可以有效降低系统成本。     

高清视频通信方案走进中小型会议环境

全球领先的统一协作通信方案提供商宝利通公司近日宣布,其屡获殊荣的HDX高清视频协作解决方案再添新丁——宝利通HDX 7000系列,该系列为专门针对中小型会议环境而设计的高清视频协作解决方案。借助卓越的宝利通极致高清体验,结合高清视频、高清语音和同步高清多媒体内容共享功能,宝利通HDX 7000系列带来超出传统会议室设施的高清视频体验。     

畅享视觉盛宴 高清你的奥运

本次奥运会不仅是第一次在中国举行,也是奥运史上第一次进行全程高清转播,因此被认为是中国高清电视发展的重要标志。所以奥运之年很多人都有换个电视看奥运的打算,本期MI就为大家精心挑选了4款高清DV和8款全高清电视,DV部分包括高清DV和全高清DV,电视部分包括5款液晶电视和3款等离子电视,搭配MI实际操控感受,为你呈上一场高清盛宴,让你更清楚地看清高清,更High地感受奥运。     

高清演播室系统搭建初探

本文介绍了河南电视台第一个高清演播室系统600平米高清演播室视频部分的设计原则、总体思路、搭建方案和针对设计方案形成的几个系统特点,论证了各种类型高标清兼容系统的优缺点,并对高清系统在实际使用中可能遇到的问题提出了一些解决经验和改进思路。     

Multiview video summarization using video partitioning and clustering

Multiview video summarization plays a crucial role in abstracting essential information form multiple videos of the same location and time. In this paper, we propose a new approach for the multiview summarization. The proposed approach uses the BIRCH clustering algorithm for the first time on the initial set of frames to get rid of the static and redundant. The work presents a new approach for shot boundary detection using frame similarity measures Jaccard and Dice. The algorithm performs effectively synchronized merging of keyframes from all camera-views to obtain the final summary. Extensive experimentation conducted on various datasets suggests that the proposed approach significantly outperforms most of the existing video summarization approaches. To state a few, a 1.5% improvement on video length reduction, 24.28% improvement in compression ratio, and 6.4% improvement in quality assessment ratio is observed on the lobby dataset.     

Constant quality video coding using video content analysis

In the literature, several rate control techniques have been proposed to aim at the optimal quality of digitally encoded video under given bit budget, channel rate and buffer size constraints. Typically, these approaches are group-of-picture (GOP) based. For longer, heterogeneous sequences, they become unacceptably complex or struggle with model mismatches. In this paper, an off-line segment-based rate control approach is proposed for controlling the distortion variation across successive shots of a video sequence when encoding with single-layer (MPEG-4 baseline, MPEG-4 AVC) and scalable (wavelet) video codecs. Consistent quality is achieved by optimally distributing the available bits among the different segments, based on efficient rate-distortion (R-D) modelling of each segment. The individual segments are defined based on shot segmentation and activity analysis techniques. The algorithm is formulated for three different distribution models: download, progressive download and streaming. The results indicate that the proposed technique improves the quality consistency significantly, while the processing overhead compared to classical two-pass variable bit-rate (VBR) encoding is limited.     

针对网络视频应用的视频转码技术综述

对视频转码的技术基础,尤其是3种典型的体系结构进行了简述和比较,然后讨论了利用从输入视频流中易于得到的信息,减少计算复杂度和改善视觉质量的方法。同时,对近年来出现的一些热点技术,如信息(包括水印和具有差错抑制特征的数据)嵌入的视频转码、H.264码流转码等进行了重点讨论。对视频转码技术的未来发展也进行了展望。     

Packet video

The 1990s will see a large increase in the use of video for many purposes, made possible through the use of new optical storage and transmission methods, as well as radio and satellite communication. HDTV, new broadcast services and 64 kbit/s ISDN video are all at an advanced stage of development. Digital methods of transmission and storage feature prominently in future scenarios of video usage. To avoid long delays in transmission, packet video techniques for storage of high-quality material on optical discs are being considered. Coded video signals can be transmitted in packet form at variable bit rate. The author discusses the principles of packet video. Packet loss, queueing delay and layered coding are discussed. The future developments are also discussed     

Digital video

Issues addressed at three Digital Systems Information Exchange meetings, held in November 1990 and March and September 1991, are summarized. The meetings explored digital developments, looked for areas of actual or potential commonality, and examined possible common frameworks for manipulating digital images. Progress in the area of digital video standards is discussed. The three main standards concern still-picture compression, video teleconferencing, and full-motion compression on digital storage media, Products being developed using standard digital video formats are surveyed. They include multimedia products, CD players, HDTV, and receivers     

A single-board video codec using video image signal processors

This paper discusses a newly developed single-board video codec using Video Image Signal Processors (VISPs). The codec has both a CCITT H.261 mode and a proprietary mode. Two VISPs, one for encoding and one for decoding, are used. The board size is 210 by 295 mm, the maximum frame rate is about 7.5 f/s, and the picture size is 180 by 144 pels.     

Blind video quality assessment based on multilevel video perception

Blind video quality assessment (VQA) metrics predict the quality of videos without the presence of reference videos. This paper proposes a new blind VQA model based on multilevel video perception, abbreviated as MVP. The model fuses three levels of video features occurring in natural video scenes to predict video quality: natural video statistics (NVS) features, global motion features and motion temporal correlation features. They represent video scene characteristics, video motion types, and video temporal correlation variations. In the process of motion feature extraction, motion compensation filtering video enhancement is adopted to highlight the motion characteristics of videos so as to improve the perceptual correlations of the video features. The experimental results on the LIVE and CSIQ video databases show that the predicted video scores of the new model are highly correlated with human perception and have low root mean square errors. MVP obviously outperforms state-of-art blind VQA metrics, and particularly demonstrates competitive performance even compared against top-performing full reference VQA metrics.     

基于视频解码器的图像卡设计

介绍了BT829B的主要特性，详细叙述了快速三维扫描系统中以BT829B为核心的图像采集系统的结构。