Xerox Corporation

Thomas F Shane

Palghat Srinivas Ramesh

Eric Michael Gross

Patricia Joanne Donaldson

Michael William Elliot

Charles A Barbe

Vivek Jaganathan

Test pattern template data are stored in a memory of a printer to identify locations spatially within image data of a test pattern printed by printheads in an inkjet printer. The test pattern template data identifies an origin of a test pattern in the image data and the distances between structures in the test pattern to enable test pattern structure in the image data to be detected and identified more easily.

System and method for analysis of test pattern image data in an inkjet printer using a template

A method of monitoring one or more patches in an image-processing device comprised of photoreceptor, a controller, and a sensor, includes obtaining specular readings and diffuse readings from the one or more patches and computing values received from the readings. In addition, the one or more patches are from about 0.1 mm to equal or less than the field of view of the sensor where each patch size, location, and approximate value is known; and an analysis of variance (ANOVA) is automatically conducted from the known size, location, and approximate value of each patch.

Reflective sensor sampling for tone reproduction control regulation

A method and system having real-time control of tone reproduction curves. The machine comprises: a moving photoreceptor; a means for storing a target tone reproduction curve; and, a means for updating a current tone reproduction curve LUT. The means for updating comprises a means for scheduling the depositing and measuring of the test patches; a means for depositing halftone test patches on the photoreceptor; a means for measuring the density of the halftone test patches and generating a measured tone reproduction curve; a means for computing differences between the measured tone reproduction curve and the target tone reproduction curve; a means for fitting the differences to a mathematical function; a means for calculating a new tone reproduction curve LUT based on the target tone reproduction curve and the fitted differences, including a means for limiting differences between the new tone reproduction curve LUT and a current tone reproduction curve LUT to a predetermined maximum magnitude; and a means for loading the current tone reproduction curve LUT with the new tone reproduction curve LUT.

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Seneca Falls, NY, United States of America

Thomas F Shane