发明申请
- 专利标题： Secure visual message communication method and device
- 专利标题（中）： 安全的视讯消息通信方式和设备
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申请号： US10503684申请日： 2003-01-27
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公开(公告)号： US20050117748A1公开(公告)日： 2005-06-02
- 发明人: Geert Schrijen , Pim Tuyls , Thomas Kevenaar , Mark Johnson
- 申请人： Geert Schrijen , Pim Tuyls , Thomas Kevenaar , Mark Johnson
- 申请人地址： NL Eindhoven
- 专利权人： Koninklijke Philips Electronics N. V.
- 当前专利权人： Koninklijke Philips Electronics N. V.
- 当前专利权人地址： NL Eindhoven
- 优先权： EP02075527.8 20020207
- 国际申请： PCT/IB03/00261 WO 20030127
- 主分类号： G02F1/13
- IPC分类号： G02F1/13 ; G02F1/133 ; G02F1/1333 ; G02F1/1335 ; G06F21/83 ; G06F21/84 ; G09G3/20 ; G09G3/36 ; H04K1/00 ; H04N7/167
摘要：
A method of and a device (501) for reconstructing a graphical message (520) using visual cryptography. Cells (303, 304) in a first liquid crystal display (701) are activated if a bit in a message sequence represents ‘1’, and not activated if said bit represents ‘0’. Cells (303, 304) in a second liquid crystal display (511) are activated if a bit in a key sequence represents ‘0’, and not activated if said bit represents ‘1’. The first and second displays (701, 511) are then superimposed so as to visually reconstruct the graphical message (520). Preferably a portion of a polarization filter (305) in an area of the first liquid crystal display (701), and a corresponding portion of a polarization filter (302) in an area of the second liquid crystal display (511) have been omitted to allow superimposition of the first and second liquid crystal displays (701, 511) at said areas.
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