Method for recognizing various lines in PDF by function fitting based on desktop software

Abstract

A method for identifying multiple types of lines in a PDF on the basis of desktop software by means of function fitting, the method being characterized in respect of comprising: step 1: opening a drawing file in a PDF format, and generating a line-fitted vector graph on the basis of an image of a plurality of monochrome lines comprised in an original file; step 2: comparing differences between a line of an original line image and lines of the fitted vector graph, and specifically calculating standard vertical distances between pixel points of the line of the original line image and a plurality of fitted vector graph lines; step 3: selecting from thereamong the fitted vector graph line having the smallest standard vertical distance as a final matching line; and step 4: determining whether the line of the original line image is a dashed line, and if the line is a dashed line, making perpendicular lines from all the pixel points of the original line image to a corresponding matching vector graph line geometric function, and storing the coordinates of feet of a perpendicular in an array.

Dependencies are inferred from the claim text.