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公开(公告)号：US4710813A
公开(公告)日：1987-12-01
申请号：US892738
申请日：1986-07-31
申请人： Robert H. Wallis , William K. Pratt
发明人： Robert H. Wallis , William K. Pratt
摘要： A low bandwidth video teleconferencing system and method is disclosed. The video teleconferencing system employs novel data compression techniques by which continuous transmission of imagery at a rate of 9600 bits/second is possible. A sketch coder converts the grey scale image to be transmitted to a sketch or line drawing, which comprises an outline of the principal boundaries plus shading to represent depth. The bandwidth required for the data representing the sketch is then compressed by two-dimensional run length coding techniques which exploit interframe and interline redundancy as well as intraline redundancy to generate a binary transmission code. Other features are also provided.
摘要翻译： 公开了一种低带宽视频电话会议系统和方法。 视频电话会议系统采用新颖的数据压缩技术，可以以9600比特/秒的速率连续传输图像。 草图编码器将要发送的灰度图像转换为草图或线条图，其包括主边界的轮廓加阴影以表示深度。 表示草图的数据所需的带宽然后通过二维游程长度编码技术进行压缩，该技术利用帧间和行间冗余以及内联冗余以产生二进制传输码。 还提供其他功能。
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公开(公告)号：US4288782A
公开(公告)日：1981-09-08
申请号：US69258
申请日：1979-08-24
CPC分类号： G06K9/6202 , G06T9/005
摘要： A high speed character matcher and method for measuring the similarity between a pair of binary patterns representing two-dimensional images. The patterns are compared on a bit by bit basis and when a discrepancy is detected, it is assigned an error penalty which is based on the two-dimensional context in which the error occurred. The types of error context which are typical in the comparison of distorted but otherwise similar characters are given a lower error than those typically encountered in the comparison of dissimilar characters.
摘要翻译： 一种用于测量代表二维图像的一对二进制图案之间的相似度的高速字符匹配器和方法。 模式被逐一比较，并且当检测到差异时，分配了基于发生错误的二维上下文的错误惩罚。 在比较失真但是相似的字符中典型的错误上下文的类型给出比在不同字符的比较中通常遇到的错误上下文的错误。
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公开(公告)号：US4410916A
公开(公告)日：1983-10-18
申请号：US281721
申请日：1981-07-09
CPC分类号： G06K9/342 , G06K9/50 , G06T9/005 , H04N1/4115 , G06K2209/01
摘要： A dual mode facsimile data compression technique which possesses the advantage of symbol recognition and extended run-length coding methods. In operation, a symbol blocking operator isolates digital raster data representing valid alphanumeric characters and document symbols. The first symbol encoungered is placed in a memory or library and as each new symbol is detected, it is compared with each entry of the library. If the comparison is within a predetermined tolerance, a library identification code representing the symbol is generated and transmitted along with the symbol location coordinates. Otherwise, the new symbol is placed in the library and its digital pattern and location is transmitted. A scoring system determines which elements of the library are to be replaced by new prototypes once the library is filled. Non-isolated symbols are coded by a two-dimensional run-length coding method for transmission.
摘要翻译： 一种双模式传真数据压缩技术，具有符号识别和扩展游程编码方法的优点。 在操作中，符号阻塞运算符隔离表示有效的字母数字字符和文档符号的数字栅格数据。 遇到的第一个符号被放置在存储器或库中，并且当检测到每个新符号时，将其与库的每个条目进行比较。 如果比较在预定的公差之内，则生成表示该符号的库标识码，并与符号位置坐标一起发送。 否则，新符号被放置在库中，并且其数字模式和位置被传送。 一旦记录库被填充，评分系统确定库的哪些元素将被新的原型代替。 非隔离符号由用于传输的二维游程编码方法编码。
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