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    Image processing apparatus capable of detecting specific originals
    44.
    发明授权
    Image processing apparatus capable of detecting specific originals 失效
    能够检测特定原稿的图像处理装置

    公开(公告)号：US5832112A

    公开(公告)日：1998-11-03

    申请号：US358144

    申请日：1994-12-16

    申请人： Masahiro Funada ,  Katsuyoshi Maeshima ,  Masanori Yamada ,  Yasumichi Suzuki ,  Yoichi Takaragi ,  Takeshi Aoyagi ,  Koichi Ishimoto

    发明人： Masahiro Funada ,  Katsuyoshi Maeshima ,  Masanori Yamada ,  Yasumichi Suzuki ,  Yoichi Takaragi ,  Takeshi Aoyagi ,  Koichi Ishimoto

    IPC分类号： H04N1/00 ,  G06K9/00

    CPC分类号： H04N1/00843 ,  H04N1/00848 ,  H04N1/00864 ,  H04N1/00875

    摘要： A color image processing apparatus that prevents counterfeiting by detecting specific originals with high precision. Although general banknotes have graphic patterns drawn on uniform density portions, the tonality percepted by human eye is the mixture of the tonality of a graphic portion and the tonality of a uniform density portion. In consideration of the mixed tonality sensed by human eye, the apparatus smoothes a read image signal to generate mixed tonality for judgment, thus improves judgment precision. The total judgment of existence/absence of specific original is made by performing m judgments on m (m>n) judging conditions using the tonality data of pre-registered n (n: positive integer) specific originals.

    摘要翻译： 一种彩色图像处理装置，通过以高精度检测特定原稿来防止伪造。 虽然一般纸币具有在均匀密度部分上绘制的图形，但人眼所看到的音调是图形部分的音调和均匀密度部分的音调的混合。 考虑到人眼感觉到的混合色调，设备平滑了读取的图像信号以产生用于判断的混合音调，从而提高判断精度。 通过使用预先登记的n（n：正整数）特定原件的音调数据，对m（m> n）判断条件进行m判断来进行特定原件的存在/不存在的总判断。

    Image data coding apparatus
    50.
    发明授权
    Image data coding apparatus 失效
    图像数据编码装置

    公开(公告)号：US4797945A

    公开(公告)日：1989-01-10

    申请号：US940421

    申请日：1986-12-11

    申请人： Yoshiyuki Suzuki ,  Masahiro Funada ,  Mamoru Sato ,  Yukio Sato

    发明人： Yoshiyuki Suzuki ,  Masahiro Funada ,  Mamoru Sato ,  Yukio Sato

    IPC分类号： G06T9/00 ,  H04N1/41 ,  G06K9/36 ,  G06K9/46

    CPC分类号： H04N19/94 ,  G06T9/008

    摘要： An image data coding apparatus adopting the method of this invention includes a divider section for dividing an image having gray levels into a plurality of blocks, each consisting of a plurality of pixels; a pre-processing section for detecting the density and the presence/absence of an edge in an image of each divided block; and a vector quantizing section for encoding an image of each block in accordance with the detected density and the presence/absence of the edge in the image of the block. The pre-processing section detects a standard deviation of density levels of the pixels included in each block. The vector quantizing section divides the density levels of the pixels included in each block into a plurality of level sections so as to obtain a code indicating the level section in which the density level of each pixel is included. In the vector quantizing section, the obtained code is again encoded by means of vector quantization.

    摘要翻译： 采用本发明的方法的图像数据编码装置包括：分割部分，用于将具有灰度级的图像分成多个块，每个块由多个像素组成; 用于检测每个分割块的图像中的边缘的密度和存在/不存在的预处理部分; 以及矢量量化部分，用于根据检测到的密度和块的图像中边缘的存在/不存在来对每个块的图像进行编码。 预处理部分检测每个块中包括的像素的浓度水平的标准偏差。 矢量量化部分将每个块中包括的像素的浓度级别分割成多个级别部分，以获得指示包括每个像素的浓度级别的级别部分的代码。 在矢量量化部分中，通过矢量量化再次对所获得的码进行编码。