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公开(公告)号：US06546120B1
公开(公告)日：2003-04-08
申请号：US09373408
申请日：1999-08-12
申请人： Minoru Etoh , Kouichi Hata
发明人： Minoru Etoh , Kouichi Hata
IPC分类号： G06K900
摘要： A correspondence-between-images detection method includes the following three basic steps: (1) Error operation step based on block matching: Block matching is executed by making a search for displacement with the difference absolute sum of intensity errors reaching the minimum from within a comparison image with respect to a block of 16×16 pixels in a reference image. (2) Quadratic error function approximation step with differential operator: Assuming that the block matching result forms a curved surface is parabolic, quadratic error function approximation is executed. (3) Nonlinear iteractive minimization step with respect to planar perspective mapping parameter: The quadratic error function sum on the whole screen is found by executing a sequential recursive step of a Newton's method improved for planar perspective mapping parameter.
摘要翻译： 图像间对应检测方法包括以下三个基本步骤：（1）基于块匹配的错误操作步骤：通过对强度误差的绝对值之差达到最小的位移进行搜索，执行块匹配 相对于参考图像中的16×16像素的块的比较图像。 （2）差分算子的二次误差函数逼近步骤：假设块匹配结果形成曲面是抛物线，则执行二次误差函数近似。 （3）相对于平面透视映射参数的非线性迭代最小化步骤：通过执行针对平面透视映射参数改进的牛顿方法的顺序递归步骤，找到整个屏幕上的二次误差函数和。
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2.发明授权Image encoder, image decoder, character checker, and data storage medium 有权图像编码器，图像解码器，字符检测器和数据存储介质公开(公告)号：US06996280B1
公开(公告)日：2006-02-07
申请号：US09719231
申请日：1999-06-09
申请人： Yoshihiko Matsukawa , Taro Imagawa , Tsuyoshi Mekata , Kouichi Hata , Minoru Eto
发明人： Yoshihiko Matsukawa , Taro Imagawa , Tsuyoshi Mekata , Kouichi Hata , Minoru Eto
摘要： An image coding apparatus includes an image feature extraction means for generating character data which includes character codes corresponding to character images included in a document image and auxiliary information indicating the sizes and positions of the respective character images in the document image based on image data indicating the document image. The image coding apparatus generates a predictive document image for the document image based on the character data, and subjects the document image data to arithmetic coding in which the probability model is changed with reference to predictive document image data. In the image coding apparatus, the probabilities of white pixels and black pixels indicated by the probability model are very close to those in the character image, whereby the coding efficiency for the character image data in the arithmetic encoder is improved.
摘要翻译： 图像编码装置包括图像特征提取装置，用于产生字符数据，该字符数据包括对应于包括在文档图像中的字符图像的字符代码和辅助信息，辅助信息指示文档图像中的各个字符图像的大小和位置， 文件图像。 图像编码装置基于字符数据生成用于文件图像的预测文档图像，并且参考预测文档图像数据对文档图像数据进行算术编码，其中概率模型被改变。 在图像编码装置中，由概率模型表示的白色像素和黑色像素的概率非常接近于文字图像中的概率，从而提高了算术编码器中的文字图像数据的编码效率。
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