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Handwriting communication system and handwriting input device used therein

  • US 6,567,078 B2
  • Filed: 01/08/2001
  • Issued: 05/20/2003
  • Est. Priority Date: 01/25/2000
  • Status: Expired due to Fees
First Claim
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1. A handwriting communication system for transmitting and receiving a handwriting by using a plurality of computers, which are connected via a network, said system comprising:

  • a handwriting input device provided at a transmitting side for inputting a handwriting into a transmitting side computer; and

    a handwriting display device provided at a receiving side for displaying said handwriting based on information transmitted from said transmitting side computer to a receiving side computer via said network;

    said handwriting input device comprising;

    a trace display means for trace information to be written in;

    an input means to write said handwriting, to erase said handwriting, or to point out said handwriting on said trace display means;

    an image taking means to take a whole image of said trace display means from above;

    a position detecting means to detect a pointed position when said input means is placed on said trace display means; and

    an image processing means to extract a contiguous image of said pointed position of said input means detected by said position detecting means from said whole image taken by said image taking means;

    said handwriting display device comprising;

    an image reconstruction means to reconstruct an image based on said contiguous image information extracted by said image processing means, and said pointed position detected by said position detecting means; and

    a handwriting display means to store and display the reconstructed image on a display screen, said position detecting means comprising a retroreflective material which is provided at a tip of said input means, and a light source which is provided adjacent to said image taking means for irradiating said input means;

    said position detecting means detecting said pointed position of said input means which is placed on said trace display means by detecting a position of said retroreflective material based on a difference in brightness in said whole image taken by said image taking means.

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