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公开(公告)号：US5818976A
公开(公告)日：1998-10-06
申请号：US170125
申请日：1993-12-20
CPC分类号： G06K9/3283 , H04N1/00681 , H04N1/00708 , H04N1/00718 , H04N1/00721 , H04N1/00734 , H04N1/00745 , H04N1/00753 , H04N1/00766 , H04N1/3878 , G06K2209/01
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US6064778A
公开(公告)日：2000-05-16
申请号：US131159
申请日：1998-08-07
CPC分类号： G06K9/3283 , H04N1/00681 , H04N1/00708 , H04N1/00718 , H04N1/00721 , H04N1/00734 , H04N1/00745 , H04N1/00753 , H04N1/00766 , H04N1/3878 , G06K2209/01
摘要： A document imaging system detects skew and/or size of a document. In one embodiment, a document imaging system generates scanning signals representing the documents, analyxes the scanning signals to detect one more edges of the document before the entire lenght of the document is scanned, establishes a skew angle between the detected edges and a reference orientation, and modifies the scanning signals to compensate for skew while the document is being scanned. 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.
摘要翻译： 文件成像系统检测文档的偏斜和/或尺寸。 在一个实施例中，文档成像系统生成表示文档的扫描信号，分析扫描信号，以便在文档的整个长度被扫描之前建立文档的另外的边缘，在检测到的边缘之间建立偏斜角和参考方位， 并修改扫描信号以补偿正在扫描文档时的歪斜。 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。
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