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    • 3. 发明授权
    • Method and apparatus for document skew and size/shape detection
    • 用于文件偏斜和尺寸/形状检测的方法和装置
    • US5818976A
    • 1998-10-06
    • US170125
    • 1993-12-20
    • Richard Clark PascoSorin Vasile PapucPierre-Alain Cotte
    • Richard Clark PascoSorin Vasile PapucPierre-Alain Cotte
    • G06K9/32H04N1/00H04N1/387
    • G06K9/3283H04N1/00681H04N1/00708H04N1/00718H04N1/00721H04N1/00734H04N1/00745H04N1/00753H04N1/00766H04N1/3878G06K2209/01
    • The present invention relates in general to optical scanning and image processing, and relates more particularly to a document imaging system which detects skew and/or detects size/shape of a document image. Preferred embodiments utilize a background with optical characteristics which contrast with those of the scanned document. In one embodiment, a document imaging system generates scanning signals in response to optical characteristics of a medium such as a sheet of paper, detects transitions in the scanning signal which define points along one or more edges of the medium, establishes a skew angle between the detected edges and a reference orientation, and compensates for skew by modifying the scanning signals as required such that the resultant skew angle is substantially equal to zero. In another embodiment, a document imaging system detects one or more edges of a document, defines a polygon having sides substantially congruent with the detected edges, and establishes the size of the document in response to the polygon.
    • 本发明一般涉及光学扫描和图像处理,更具体地涉及一种检测文档图像的偏斜和/或检测尺寸/形状的文档成像系统。 优选实施例利用具有与扫描文档的背景相反的光学特性的背景。 在一个实施例中,文档成像系统响应于介质(例如一张纸)的光学特性产生扫描信号,检测沿着介质的一个或多个边缘限定点的扫描信号中的转变,建立在 检测到的边缘和参考方向,并且通过根据需要修改扫描信号来补偿偏斜,使得所得到的斜角基本上等于零。 在另一个实施例中,文档成像系统检测文档的一个或多个边缘,定义具有与检测到的边缘基本一致的边的多边形,并响应于多边形确定文档的大小。