Hewlett-packard Development Company, L.P.

Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Amit, Gal

Lior Katz

Doron Shaked

Yaron Grinwald

Ran Waidman

Gal Amit

Ron Maurer

Michal Aharon

Gregory Katz

Tsafrir Yedid Am

Regina Guslitzer

Yavin Atzmon

Nadav Barkai

Ayelet Pnueli

Hadas Kogan

Uri Lidai

Pavel Blinchuk

Yohanan Sivan

Rivay Mor

Sagi Yehonatan Refael

Iliya Shahamov

Kogan Hadas

Ami Shiff

Avner Arnstein

Meirav Naaman

Ariel Hagege

Ziv GiLAN

An example is provided to calculate calibration data for or print quality data of a printer, in one example, image data on printed elements of a plurality of patches printed at different powers or intensities by a print device may be determined.

Obtaining printed element data of patches to determine calibration data of a printer

A printer () is disclosed. The printer has two scanners () in the paper path of the printer located after the print zone (). The two scanners are spaced apart from each other by a known distance A and overlap each other in a direction perpendicular to the media axis of travel. The two scanners capture a first and second image of the media.

Printer with two scanners

A method includes forming a second set of printing dots on a photosensitive member by a printing dot applicator corresponding to image data of second portions of the image adjacent to first portions of the image. The second set of printing dots are formed on the photosensitive member after the first set of printing dots have been transferred from the photosensitive member. Thus, a merging of adjacent printing dots due to an electrical interaction there between on the photosensitive member is reduced.

Reduce merging of adjacent printing dots on a photosensitive member

A system can comprise a memory to store machine readable instructions and a processing unit to access the memory and execute the machine readable instructions. The machine readable instructions can comprise a press color state (PCS) estimator to calculate an optical density for each of four single separation solid colors based on a color measurement provided by a scanner. The color measurement can characterize material printed on a substrate and scanned by a scanner. The PCS estimator can also provide an updated LUT for each of the four single separation colors based on the color measurement provided by the scanner. The machine readable instructions can comprise a print controller to provide the optical density for each of the four single separation solid colors and the updated LUT to a printer to facilitate color calibration of the printer.

Press color state estimator

A method for position calibration of a spot of a known geometry of an optical sensor is disclosed. The method may include providing a position calibration patch on a sheet at a position which is known with respect to a reference position on the sheet, along a scan path of the spot of the optical sensor across the sheet. The patch may include at least two adjacent blocks of different colors. The method may also include obtaining a sampling of the position calibration patch using the optical sensor. The method may further include determining from the sampling a relative coverage of the spot over the color blocks of the position calibration patch, and based on the known geometry of the spot and on the determined relative coverage, determining the position of the spot of the sensor with respect to the reference position.

System and method for position calibration of a spot of an optical sensor

A signal from a system, such as a reactive system, that reflects health indicators of the system may be selected. A signal analyzer may extract the health indicators from the signal and conduct a diagnostics of the health of the system based on the health indicators.

Analysis of health indicators of a system

Techniques for correcting the color uniformity of a laser printer of a digital press or other device are provided. A process for correcting the color uniformity of a laser printer may include scanning a test page by an inline scanner of a digital press, determining scanner signal data from the test page, determining a scanner polynomial fitted to the scanner signal data, and determining a non-uniform coverage polynomial from the scanner polynomial. Additionally, techniques for verifying the linearity of a scanner are also provided.

Color uniformity correction using a scanner

A method for position calibration of a spot of an optical sensor may include providing a position calibration patch on a sheet at a predetermined position, along a scan path of the spot across the sheet, the patch comprising at least two adjacent blocks of different colors. The method may also include obtaining a single sample of the position calibration patch using the optical sensor. The method may further include determining from the single sample the position of the spot of the sensor with respect to the position calibration patch.

Position calibration of a spot of an optical sensor

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Ness Ziona, Israel

Lior Katz