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    • 3. 发明授权
    • High resolution graphics system for video/teleconferencing systems
    • 用于视频/电话会议系统的高分辨率图形系统
    • US4688108A
    • 1987-08-18
    • US786673
    • 1985-10-11
    • Robert V. CottonEdward J. Klodnicki
    • Robert V. CottonEdward J. Klodnicki
    • G06T9/00H04N1/32H04N1/419H04N1/42
    • H04N1/32566G06T9/005
    • A high resolution graphics system scans an 81/2.times.11 inch document at a resolution of approximately 200 lines per inch and transmits a run length codes 1700.times.2200 pixel array facsimile signal to a remote station for display or hard copy reproduction. Alternatively the present system can receive a compressed coded facsimile signal, decompress it and convert it to a video signal. The system is a modular design including the document scanning subsystem, a gray-to-facsimile converter, data compression and decompression circuits, as well as a high speed input/output communication system interface. The document scanning subsystem employs a fixed camera capable of scanning a document without any mechanical movement therebetween. The various modules are interconnected by means of a VME bus to a central processing unit which controls and monitors the system. A random access memory (RAM) is included for storing the compressed data either prior to transmission or subsequent to reception. The input/output interface includes a communications port, such as a RS449 port capable of sending or receiving data over the communication system at rates in the range of 56 to 448 Kbs.
    • 高分辨率图形系统以每英寸约200线的分辨率扫描81 / 2x11英寸的文档,并将运行长度代码1700x2200像素阵列传真信号发送到远程站以进行显示或硬拷贝再现。 或者,本系统可以接收压缩的编码传真信号,解压缩并将其转换为视频信号。 该系统是包括文件扫描子系统,灰色到传真转换器,数据压缩和解压缩电路以及高速输入/输出通信系统接口的模块化设计。 文件扫描子系统采用能够扫描文件的固定照相机,而在其间没有任何机械移动。 各种模块通过VME总线互连到控制和监视系统的中央处理单元。 包括随机存取存储器(RAM),用于在发送之前或接收之后存储压缩数据。 输入/输出接口包括一个通信端口,例如能够通过通信系统发送或接收数据的RS449端口,速率范围为56到448 Kbs。