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Telewriting terminal system performing adding/deleting operation of an image based on control information

  • US 5,745,688 A
  • Filed: 01/23/1996
  • Issued: 04/28/1998
  • Est. Priority Date: 02/28/1995
  • Status: Expired due to Fees
First Claim
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1. A telewriting system comprising:

  • a plurality of telewriting terminals connected with a communication line, each of said telewriting terminals having a display unit so as to display an image thereon, the image displayed on said display unit being changed in accordance with instruction information transmitted via the communication line; and

    a server unit connected to each of said telewriting terminals by the communication line, said server unit comprising,communication means for communicating the instruction information and image information with each of said telewriting terminals via the communication line,an image memory for storing image information corresponding to an image displayed on said display unit at of each of said telewriting terminals,change means for changing the image information to be stored in said image memory, when the instruction information requesting a change of the image is received from at least one of said telewriting terminals, in accordance with the received instruction information,differential information extraction means for extracting differential information between the image information before the change and the image information after the change, anddistribution means for distributing the differential information to each of said plurality of telewriting terminals, wherein said plurality of telewriting terminals are configured to adjust said image displayed on said display unit based on said differential information provided from said distribution means.

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