Patent ID: 6556701
Filing Date: 2003-04-29
Classification: G06K

Abstract:
A method of extracting a dotted line on a document, comprising:a first step of extracting isolated points from an image on the document; a second step of extracting the isolated points configuring a candidate of the dotted line on the basis of a positional relationship between the two adjacent isolated points; and a third step of judging a validity of the candidate of the dotted line from a positional relationship between groups of the extracted isolated points of the candidate of the dotted line, wherein said third step includes a step of judging the validity of the candidate of the dotted line by judging the regularity of spacing between the isolated points, and wherein said third step further includes a step of judging the validity of the candidate of the dotted line by calculating a gradient of a line segment configured by the group of the isolated points.