公开(公告)号：US5694494A

公开(公告)日：1997-12-02

申请号：US712663

申请日：1996-09-13

申请人： Peter Hart ,  Mark Peairs ,  Mitsutoshi Mizutani

发明人： Peter Hart ,  Mark Peairs ,  Mitsutoshi Mizutani

IPC分类号： G06K9/20 ,  G06K9/34 ,  G06T1/00 ,  G06T5/20 ,  G06K9/00

CPC分类号： G06T5/20 ,  G06K9/346 ,  G06K2209/01

摘要： A method for retrieving user-supplied information from a scanned version of a completed document is described. The method includes the steps of obtaining a first image of the document having information printed thereon in its blank format before other information has been added to it by the user. A second image of the document is obtained after information has been added to it by the user. The two images are aligned, and for each pixel in the first image which corresponds to information on the document, those pixels are deleted from the second image to create an image which corresponds to subtraction of the first image from the second image. Finally, a step is performed to electronically restore the information added by the user which was deleted during the subtraction operation.

摘要翻译： 描述从完成的文档的扫描版本检索用户提供的信息的方法。 该方法包括以下步骤：在由用户添加其它信息之前，以其空白格式获得其上印有信息的文档的第一图像。 文件的第二个图像是在用户添加了信息之后获得的。 两个图像对齐，并且对于与文档上的信息对应的第一图像中的每个像素，从第二图像中删除那些像素以创建对应于从第二图像中减去第一图像的图像。 最后，执行步骤以电子地还原在减法操作期间被删除的用户添加的信息。