Ricoh Production Print Solutions LLC

Ricoh Company, Ltd.

Infoprintsolutions Company, LLC

Kartheek Chandu

Mikel J Stanich

Larry Mason Ernst

Chai Wah Wu

Barry Marshall Trager

Sreenath Rao Vantaram

Carl Robert Bildstein

Joan LaVerne Mitchell

Nenad Rijavec

James Francis Crossland

Gary R Williams

Mikel John Stanich

A method is disclosed. The method includes analyzing an image of a first flushing pattern applied on a medium during production of a print job to detect presence of one or more defective ink jet nozzles and adjusting to a second flushing pattern during the production of the print job upon detecting the presence of one or more defective print head nozzles.

Dynamic inkjet nozzle flushing mechanism

A printing system is disclosed. The printing system includes a halftone calibration system that receives one or more un-calibrated halftones, generates one or more calibrated halftones using an ink model from the one or more un-calibrated halftones, analyzes a printed calibration screen of the one or more calibrated halftones, and performs a halftone calibration.

Halftone calibration mechanism employing an ink model

A method is disclosed. The method includes generating a halftone screen using a Direct Multi-bit Search Screen Algorithm (DMSSA) to optimize a halftone pattern at each gray level.

Mechanism for generating a hybrid halftone using a DMSSA screen

A method is disclosed. The method includes applying a human visual system (HVS) model to a Continuous Tone Image (CTI) and a initial Half Tone Image (HTI) to generate a perceived CTI and a perceived HTI and computing a change in pixel error for a first pixel by toggling the first pixel with all the possible output states and swapping the first pixel with all neighbor pixels.

Halftone mechanism

A printer is described having a control unit and/or image processor to determine a number of pixels by which to scale an image along an axis of the image, wherein, the scaling of the image is less than 10% of the image along the axis. The control unit and/or image processor is also to identify locations along the axis equal to the number. The control unit and/or image processor is also to remove a region of more than one pixel along the axis at each of the locations. The control unit and/or image processor is also to insert a region of more than one pixel along the axis at each of the locations, where, a difference between pixels removed and pixels inserted accounts for the number.

Low overhead near unity scaling technique

A method is disclosed. The method includes receiving a first image as a continuous tone image, screening the image to render a second image as a (Halftone Image) HTI, selecting an area of the first image for enhancement, and iteratively processing the selected area of the first image to render a third image as a multibit HTI.

Digital image halftone conversion with selective enhancement

A method is disclosed. The method includes estimating a quantity of toner to be used to print a job at a printer by calculating a buildup of toner at edges of data on each page of the print job.

Toner Estimation Mechanism

A method is described that entails printing a series of test patterns. Each test pattern has its own respective set of outer lines and set of inner lines. The series of test patterns have a different intended spacing between their respective inner lines and outer lines. The intended spacing of each test pattern is printed in a manner that correlates the intended spacing of each test pattern with its test pattern. Each of the outer lines are printed with a first print source and each of the inner lines printed with a second print source. Inner lines of a first set of the test patterns are shorter than inner lines of a second set of the test patterns to enhance resolution at which differences in the spacings between respective inner and outer lines of same test patterns are able to be detected across different test patterns.

Test patterns for print heads having two image sources

A method is disclosed. The method includes receiving print job data, rasterizing the print job data to generate image data for each page of the print job data to be printed, calculating a coverage per unit area for two or more color planes of each page of the image data and calculating a flushing mask to flush nozzles of the inkjet print head.

Inkjet nozzle flushing mechanism

A method is disclosed. The method includes generating a Continuous Tone Image (CTI) with all pixel values same as the first gray level and an initial Half Tone Image (HTI) with all pixel values equal to minimum absorptance level, computing a change in pixel error by toggling with all the possible output states and swapping with all neighbor pixels only if the stacking constraint is satisfied, updating the HTI with the maximum error decrease operation and continue to next pixel location till the end criteria is met. Once the end criteria is met, the updated HTI is saved as a final halftone screen for that gray level and copied as the initial HTI for the next gray level along with CTI pixel values updated to the next gray level till the final gray value is reached.

Halftone screen generation mechanism

A method is disclosed. The method includes generating a Continuous Tone Image (CTI) with all pixel values same as a first gray level, generating an initial Half Tone Image (HTI) with all pixel values equal to minimum absorptance level and computing a change in pixel error for a first pixel. The change in pixel error is computed by identifying a first pixel indicated in a valid pixel map, toggling the first pixel with all the possible output states and swapping the first pixel with all neighbor pixels only if the stacking constraint is satisfied, updating the HTI with the maximum error decrease operation and continue to next pixel location till the end criteria is met.

Hybrid halftone generation mechanism using change in pixel error

A method is disclosed. The method includes generating a set of points via energy minimization to implement halftone seed pattern.

Method and system for halftoning using energy minimization

A method is disclosed. The method includes receiving image data from one or more image readers and analyzing the image data to locate and classify artifacts on the medium caused by defective print engine nozzles.

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Longmont, CO, United States of America

Kartheek Chandu