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    • 2. 发明申请
    • OPTICAL IMAGE AUTHENTICATOR
    • 光学图像认证机构
    • WO1997006502A1
    • 1997-02-20
    • PCT/AU1996000498
    • 1996-08-07
    • MIKOH TECHNOLOGY LIMITEDATHERTON, Peter, SamuelCHANDLER, Charles, E.POTTER, Robert, J.
    • MIKOH TECHNOLOGY LIMITED
    • G06K05/00
    • G06K7/1092G06K9/6202G07D7/00
    • Optical Image Authenticator and method where a light intensity pixel array is detected and compared with a reference pixel array on a pixel by pixel basis to determine if each pixel is either good or bad. Authentication is done on the basis of the number of good/bad pixel's or their ratio. Pixel's are assigned a grey scale value or a binary value. Values are allocated with respect to different threshold levels. The optical memory can be a pixilated diffraction grating or "pixelgram". Detection is via a CCD sensor and a laser pulses every frame. Detected pattern starting point position is matched with the respective positions in the authentic pattern. The authentic pattern is stored in a variety of forms which have been rotated or linearly translated. For use in the field of securities and credit cards.
    • 光学图像鉴别器和方法,其中检测到光强度像素阵列并逐个像素地与参考像素阵列进行比较,以确定每个像素是好还是坏。 验证是根据好/坏像素的数量或它们的比例来完成的。 像素被分配了灰度值或二进制值。 相对于不同的阈值级别分配值。 光学存储器可以是像素化衍射光栅或“像素图”。 通过CCD传感器和每帧的激光脉冲进行检测。 检测到的图案起点位置与真实图案中的各个位置相匹配。 真实图案以旋转或线性翻译的各种形式存储。 用于证券和信用卡领域。