Patent ID: 6698355
Filing Date: 2004-03-02
Classification: B41F,Y10S

Abstract:
A patch measurement device provided in a printing apparatus for detecting a patch position representing a position of a patch in a control strip printed on paper by the printing apparatus, wherein,the control strip and a reference mark are printed on the paper with a prescribed relative distance between the reference mark to the patch, and printed-image data representing the control strip and the reference mark printed on the paper are generated through imaging by an imaging device provided in the printing apparatus, the patch measurement device comprising: a storage section for storing the printed-image data sent from the imaging device; a mark detection section for detecting the reference mark based on the printed-image data stored in the data storage section; a correction section for calculating as a correcting coefficient a ratio between a printed-image data length and a predetermined known length of a position corresponding to the printed-image data length, wherein the printed-image data length is a length on the printed-image data calculated based on the reference mark detected by the mark detection section; and a position detection section for detecting the patch position with respect to the reference mark on the printed-image data, based on the correcting coefficient calculated by the correction section and the prescribed relative distance.