Patent ID: 8197022
Filing Date: 2012-06-12
Classification: B41J

Abstract:
1. A method for determining a speed compensation factor T tr to be used along with a measurement of media velocity for determining a time of flight displacement distance in an inkjet printing system, the method comprising the steps of: (a) transporting a media moving at first speed V (b) printing a first image on the media using at least one printhead while the print media is moving at the first speed relative to the at least one printhead; (c) capturing the first image in a first frame of an image capture device; (d) transporting the media moving at a second speed V (e) printing a second image on the media using the at least one printhead while moving at the second speed; (f) capturing the second image in a second frame of the image capture device; (g) determining a change of position of the first image relative to the second image using automated image analysis δD ; (h) inputting the determined change of position into a processor for computing the speed compensation factor T