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Development of Encoding System for Continuous Gray Level and Color Images in a Mixed Mode Communication

混合模式通信中连续灰度和彩色图像编码系统的开发

基本信息

批准号：
60850171
负责人：
MINAMI Toshi
金额：
$ 3.2万
依托单位：
KOGAKUIN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

The mixed mode communication system which integrates the teletex and the facsimile is considered to be the most useful transmission system from the viewpoint of the transmission efficiency and the quality of received documents. To implement the mixed mode communication system, researches and developments are being carried out extensively in various laboratories. In this system the textual part of a document is transmitted with data codes and the graphic part is transmitted with facsimile codes and the amount of the coded signal can be compared effectively.On the other hand, in proportion to the increase of visual communication demands, the requirements for functions of facsimile are diversified and complicated. Among them, the development of encoding system for the photograph facsimile and color facsimile becomes very important subject. Under this background, in this study, the high compression encoding system with (1) variable size block coding scheme based on block merging and (2) successive clustering and predictive vector quantization, is studied theoretically and experimentally. An experimental model which consists of an input camera, a super personal computer and a display terminal is fabricated and the technical feasibility and usefulness of the coding algorithms are investigated.The experimental results of encoding show that for the continuous tone images, the number of required bits for encoding are 0.43-0.66bits/pel and the S/N of the decoded images are 38.29-34.18dB with the algorithm (1), and with the algorithm (2) those values are 0.5-0.8bits/pel and 30-36dB. This shows that the coding efficiency is increased about 30% compared with the conventional coder. For the colored images, the number of required bits for encoding and the S/N are 0.6-1.02bits/pel and 38.5-33.3dB with the algorithm (1) and 0.3-3.30bits/pel and 34-48.4dB with the algorithm (2).These results categorically prove the usefulness and superiority of the newly developed encoding system.

从传输效率和接收文件质量的角度来看，电传与传真相结合的混合模式通信系统被认为是最有用的传输系统。为了实现混合模式通信系统，各个实验室正在进行广泛的研究和开发。在该系统中，文件的文本部分采用数据码传输，图形部分采用传真码传输，可以有效地比较编码信号的量。另一方面，随着视觉传达需求的增加，对传真功能的要求也越来越多样化和复杂化。其中，照片传真和彩色传真编码系统的开发成为一个非常重要的课题。在此背景下，本文对基于块合并的可变大小块编码方案和基于连续聚类和预测矢量量化的高压缩编码系统进行了理论和实验研究。制作了一个由输入摄像机、超级个人计算机和显示终端组成的实验模型，并对编码算法的技术可行性和实用性进行了研究。编码实验结果表明，对于连续色调图像，采用算法(1)编码所需比特数为0.43 ~ 0.66bits/pel，解码图像信噪比为38.29 ~ 34.18 db，采用算法(2)编码所需比特数为0.5 ~ 0.8bits/pel，解码图像信噪比为30 ~ 36db。与传统编码器相比，编码效率提高了30%左右。对于彩色图像，采用算法(1)编码所需比特数为0.6 ~ 1.02bits/pel，信噪比为38.5 ~ 33.3 db；采用算法(2)编码所需比特数为0.3 ~ 3.30bits/pel，信噪比为34 ~ 48.4 db。这些结果明确地证明了新开发的编码系统的有效性和优越性。