Patent ID: 6568777
Filing Date: 2003-05-27
Classification: B41J,H04N

Abstract:
A printing device comprising:a print head for printing on a print media; and a navigation unit configured to optically monitor a random cooperative navigation surface and at a predetermined time to generate first image data representative of an image of a first portion of said random cooperative navigation surface and store said first image data into memory; said navigation unit is further configured to generate second image data representative of a second image of a second portion of said random cooperative navigation surface that includes at least a portion of said first portion of said random cooperative navigation surface; said navigation unit comprises a navigation engine configured to compare said first image data and said second image data to determine an offset between said first image data and said second image data; said navigation unit and said print head are configured to move in unison; and controller for positioning said print head in accordance with said offset determined by said navigation unit.