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    • 9. 发明申请
    • IMAGE ENCRYPTION METHOD AND VISUAL DECRYPTION DEVICE
    • 图像加密方法和视觉分解设备
    • WO2004023694A1
    • 2004-03-18
    • PCT/IB2003/003842
    • 2003-08-27
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.KEVENAAR, Thomas, A., M.JOHNSON, Mark, T.SCHRIJEN, Geert, J.TUYLS, Pim, T.
    • KEVENAAR, Thomas, A., M.JOHNSON, Mark, T.SCHRIJEN, Geert, J.TUYLS, Pim, T.
    • H04K1/00
    • G09C5/00
    • A method of encoding a graphical message (220, 221) based on a key sequence as an encoded sequence of information units. For each pixel of the message, said pixel having a normalized intensity I, a total rotation α which results in a liquid crystal display in a pixel with substantially the intensity I is determined. The key sequence contains arbitrary rotations. The difference between the total rotation α and a corresponding rotation in the key sequence is output as an element of the encoded sequence. A device (201) presents pixels with rotations indicated by the encoded sequence on a first display (701) and pixels with rotations indicated by the key sequence on a second display (211). Superimposing the two displays reveals the graphical message. The method can be repeated for red, green and blue intensities of color pixels, allowing colored graphical messages to be encoded and reconstructed.
    • 一种基于密钥序列编码图形消息(220,221)作为编码信息单元序列的方法。 对于消息的每个像素,所述像素具有归一化强度I,确定导致具有基本上强度I的像素中的液晶显示的总旋转α。 关键序列包含任意旋转。 键序列中的总旋转α与相应的旋转之间的差异被输出为编码序列的元素。 设备(201)在第一显示器(701)上呈现由编码序列指示的旋转的像素,并且在第二显示器(211)上呈现由键序列指示的旋转的像素。 叠加两个显示屏显示图形信息。 该方法可以重复红色,绿色和蓝色强度的彩色像素,允许彩色图形消息进行编码和重构。