METHOD AND APPARATUS FOR DOCUMENT SKEW AND SIZE/SHAPE DETECTION
- 申请公布号：
- WO9512271(A1)
- 申请号：
- WO1994US12038
- 申请日期：
- 1994.10.21
- 申请公布日期：
- 1995.05.04
- 申请人：
- VISIONEER COMMUNICATIONS, INC.
- 发明人：
- PASCO, RICHARD, CLARK;PAPUC, SORIN, VASILE;COTTE, PIERRE-ALAIN
- 分类号：
- G06K9/32;H04N1/00;H04N1/387;(IPC1-7):H04N1/00
- 主分类号：
- G06K9/32
- 摘要：
- <p>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.</p>
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