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AssigneeXerox Corporation
InventorsD. Rene Rasmussen, Edul N. Dalal, Bimal Mishra
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This invention specifically covers one of the many image quality (IQ) metrics that can be part of an overall image quality analysis engine. The specific problem with image quality addressed with this metric is that of a region of a printed (or copied) image, which was intended to have a uniform color, but which shows visible color variations. The color variation can have many different forms, both with respect to the type of color difference and with respect to the spatial nature of the non-uniformities. The image quality analysis system readily distinguishes between non-uniformities in the following different categories, including: (a) amplitude modulated cluster dot halftone patterns; (b) frequency modulated halftone patterns (e.g., stochastic screens); (c) irregular two-dimensional variations from noise; (d) isolated (non-periodic) one-dimensional streaks; (e) periodic, one-dimensional bands; and (f) two-dimensional periodic variations (Moire). The results from the image quality analysis can then be used as a basis for diagnosing machine problems.
An image quality analysis System for determination color non-uniformities in an image output device, comprising:
A method of performing image quality analysis on an image output device having an output station that generates a hardcopy image from a digital image, the method comprising:
A method of performing image quality analysis on an image output device having an output station that generates a hardcopy image from a digital image, the method comprising:
A method of performing image quality analysis on an image output device having an output station that generates a hardcopy image from a digital image, the method comprising:
Dependencies are inferred from the claim text.