Recursive Estimation of Local Characteristics of Edges in TV Pictures as Applied to ADPCM Coding

In this paper, an algorithm is presented for extracting edges and estimating their local characteristics in TV pictures; the algorithm is designed for application to adaptive DPCM coding of TV pictures and it has the following properties: 1) it takes into account the causality constraint encountered in DPCM coding; 2) it is fitted to the line-by-line scanning of TV pictures; 3) it is fast, involving only a small amount of computation, and thus allowing real-time implementation. The whole processing is split into a local preprocessing and a global processing where the characteristics of the edges are renewed recursively line by line. This algorithm was used for implementing an adaptive choice of the prediction in DPCM coding of TV pictures.     

电视图像打印装置的设计

本文提出一种打印电视图像的方法,介绍了打印装置的硬件、软件设计。该打印装置还可作简单的图像处理。     

移动电视中的统计复用

统计复用作为一种节省带宽的技术在通信领域得到广泛应用,本文针对移动电视领域,对统计复用的系统组成、实施技术进行了讨论,并分析了其性能特点。     

数字电视显示图像的同心度、重显率和过扫描

讨论了数字电视显示图像的同心度、重显率和过扫描，描述了它们的测量方法，重点分析了它们之间的内在联系，以及用它们来衡量显示图像质量的优缺点。实测表明，正确调整和测定这些指标，对保证数字电视图像主观效果具有重要作用。     

Statistical Word Synchronization in PCM Transmission of TV Signals

Word synchronization in PCM of TV signals is more important than that of audio signals, since often a single channel of TV signals is transmitted independently. For this purpose, new word synchronization is proposed, where the statistical property of TV signals is utilized instead of adding a bit for synchronization. The property is that a more significant bit in PCM does not change word by word as frequently as a less significant bit, because of the correlation between adjacent picture elements, i.e., sampled values or words. Mathematical calculation shows that the average time between misframes is as long as 10⁴years and the average recovery time is less than several lines when a 4-bit reversible counter for synchronization is used in transmitting 500-kHz narrow-band TV-phone signals.     

广播电视监测数据统计分析方法

本文对采用自动化、网络化手段之后广播电视监测数据的统计分析方法进行探讨。     

CMMB手持电视与模拟电视发射共用天线探讨

随着电视节目的增加,数字移动接收已成为可能。而架设新的天线对已有的满负荷运行发射塔来说不是一件易事。用双工器将模拟电视与数字电视共用一副天线发射时也存在一些问题。本文就CMMB手持电视与模拟电视发射共用天线问题进行探讨。     

模转数之际乡镇广电站管理问题探讨

有线电视模转数是有线数字电视发展必然经历的阶段。随着文化体制改革的不断深入和广电网络的快速发展,乡镇广播电视站的建设出现了许多新情况、新问题,理顺乡镇广电站的管理关系,提升服务质量,规范站风站貌,完善内部管理,是模转数过程中乡镇广电站管理有待解决的主要矛盾。     

高校有线电视数字化方案探析

数字电视世界范围内蓬勃发展成为时代之选,我国数字电视整体转换进程已入纵深。大学体制内的有线电视系统如何实现数字化？结合当地和本单位情况,有针对性地加以探析,设计提出了结合实际、满足功能、体现特色的技术路径方案。     

A Study of High-Definition TV System in the Future

The results of our studies of high-definition television system are described concerning picture quality, signal standard and transmission system.     

广播电视台开展增值业务可行性研究

本文结合英德市广播电视事业发展的实际,客观分析了目前的行业技术走向和业务发展形势,就山区县级市如何科学稳健开展增值业务进行详尽的分析研究。     

中央广播电视节目无线数字化覆盖工程测试数据统计实例分析

本文将无线覆盖理论与覆盖工作实践相结合,通过实地测试接收功率、误码率、信噪比等相关数据,对中央广播电视节目无线数字化覆盖工程在岳阳市区的实际覆盖效果进行综合分析,给出了一些重要结论以及后续完善建议.     

城市电视台高清电视发展模式研究

本文从影响高清电视发展战略的五个方面,分析了广东省高清电视发展的环境和城市电视台高清电视发展的现状,考虑到城市电视台发展的不平衡,作者尝试提出发展城市台高清电视产业的科学方法和合理模式。     

一维无公度系统的迁移率边

应用增长因子判据,研究了一维无公度系统Soukoulis-Economou模型电子态的局域性质,得到了该模型的局部迁移率边,进一步证实了应用Landauer公式计算电阻得出的迁移率边结构.     

Source Coding of X-Ray Pictures

The feasibility of three specific coding schemes for compact storage or fast transmission of radiographic images is investigated. These schemes are: the synthetic high system, the block-coding system, and the run-length coding system. The last two techniques are used for encoding bit planes. The dependence of the compression ratio on image resolution and the feasibility of adaptive coding of bit planes are also examined.     

水下电视图像预处理方法研究

分析了水下图像特性,对比了迭代阈值法、减去固定背景法、减去当前背景法、数学形态学方法4种常用方法的预处理结果,指出了它们的不足,并提出了基于小波边缘检测的水下图像预处理算法.实际应用表明,新算法处理效果很好,能够满足水下智能监控系统的要求.     

辽北地区有线数字电视发展刍议

以辽北有线电视为例,阐述了县(市)区有线数字电视发展需要注意和解决的问题,并提出了辽北地区有线电视的数字化发展设想.     

Subjectively Optimal Quantization of Pictures

The problem of quantization has been thoroughly studied for random processes. The usual criterion is to minimize the mean square error. Because of the eye's characteristics, this does not lead to the least number of bits. In this concise paper the results of experiments on gray scales and on quantized pictures are presented which lead to the choice of a compressor with a subjectively optimal parameter in the class of logarithmic compressors. Comparisons are made between the minimum mean square error quantizers on luminance signals, the usual quantizer for television signals (linear quantizer after a gamma correction) and the proposed quantization scheme designed for real visual scenes.