Patent ID: 6736478
Filing Date: 2004-05-18
Classification: H04N

Abstract:
Process for automatically determining the image quality of a picture produced by a printing device or photo exposer, comprising the steps of:a) providing a reference test chart and transforming it into a digital form; b) inputting the digital form of the reference test chart into a photo printer; c) producing in the photo printer a photo printer specific test chart printout of the digital reference test chart; d) scanning the photo printer specific test chart printout and comparing the obtained digital image of the test chart printout with the digital form of the reference test chart; and e) determining at least one quality parameter by way of concurrences and/or deviations obtained by the comparison between the reference test pattern and the photo printer specific test image; wherein the reference test chart is one of a single reference test chart and a set of reference test charts and includes several test patterns which respectively specifically react to different causes for image quality, the test patterns being compared with a photo printer specific test image or with photo printer specific test image test patterns.