構成要素のレイアウト情報を用いたカラー文書画像の方位検出

抄録

We present a method of detecting the color document's horizontal(or vertical) direction using the local layout information of document's components. Different from conventional string or string-line detections which have been intensively studied in an image-based document processing, the presented method deals with a color document with or without strings included as document's components. The given color document is analized following three steps of (a)color subtraction, (b)detection of two line segments which wrap appropriate two components in the form of a single convex hull and (c)generating the histogram based on the frequency of above line segments. The overall direction for a given document is basically computed using this histogram. The experiment is carried out for 92 color documents including those with or without strings. The result shows that a satisfactory direction is obtained for 90 documents tested.