Method and apparatus for recognizing meandering of web.

摘要

According to a method and apparatus for recognizing meandering of a web, all pixel addresses and all pixel data of printed matter serving as a reference are received and it is determined whether each pixel represents a region in which an abrupt change in density occurs as an edge. The pixel address and pixel data of each pixel determined as an edge are stored as the reference image data. A difference value between pixel data of test image data obtained from the web on which a test object is printed and pixel data of the reference data at the pixel addresses of the reference data and the corresponding pixel addresses of the test image data in a one-to-one correspondence is calculated. A meandering state of the web is recognized on the basis of each difference value.