Hewlett-packard Development Company, L.P.

Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Ram Dagan

Noam Shaham

Gideon Amir

Oren Haik

Tal Frank

Carl Staelin

Dror Kella

Gidi Amir

Marina Limonov

Michael Melamed

Boaz Tagansky

Oded Perry

Gregory Braverman

Yotam Ben-Shoshan

Liron Itan

Mirta Perlman

David Ben Ovadia

Steven J Simske

Doron Shaked

Omer Barkol

Mani Fischer

Lluis Abello Rosello

Marie Vans

Sagi Schein

Joan Vidal Fortia

Rodolfo Jodra

David Edward Staas

Jorge Martinez De Salinas Vazquez

Orel Bat Mor

Itamar Roth

Tal Framk

Avi Malki

David Ben-Ovadia

Shani Gat

In an example, a method includes obtaining, by at least one processor, a first halftone screen tile having a first halftone pattern. In some examples, the method further comprises obtaining a second halftone screen tile having a second halftone pattern. The method may include determining a halftone screen having a predetermined spatial arrangement of the first and second halftone screen tiles, wherein the relative placement of the first and second halftone screen tiles in the predetermined spatial arrangement provides a signature for the halftone screen which when applied to image data provides a printed output in which the signature is discernible.

Halftone screen tiles

A method is described in which a length of an image is compared with a threshold associated to a print device. The image is subdivided into a sequence of print frames. Each print frame has length equal to or less than the threshold. A stitching operation is performed on at least two consecutive print Compare a length of an image with a threshold frames. The print device is controlled to sequentially print the at least two stitched consecutive print frames.

Stitching frames into which image has been subdivided along length of image

Examples analyze a digital image to determine an amount of high-frequencies corresponding to each pixel of the digital image based at least in part on gradients corresponding to a pixel neighborhood of each pixel. Examples analyze the digital image to determine a degree of randomness for each pixel based at least in part on the corresponding gradients. Examples generate an activity mask for the digital image based at least in part on the amount of high-frequencies and the degree of randomness corresponding to each pixel. Examples process the pixels of the digital image by performing gray component replacement to generate a color transformed image based at least in part on the activity mask.

Gray component replacement in a digital image to generate a color transformed image

An example system includes a color engine to separate an image into a plurality of color components. The system also includes a halftone engine to generate a plurality of halftone images based on the plurality of color components and a plurality of halftone screens. For each halftone screen, the halftone cell centers for that halftone screen occur at regular or semi-regular distances relative to a dot pitch. The plurality of halftone screens forms a high frequency moire pattern when the halftone screens are overlaid on each other. Each of the halftone screens have a granularity metric less than a threshold.

Halftone screens

A halftone comprises a first halftone screen and a second halftone screen. The first halftone screen comprises a first plurality of amplitude modulated dots arranged according to a first plurality of rows, the first plurality of rows being orientated according to a first direction and comprising a first dot spacing. The second halftone screen comprises a second plurality of amplitude modulated dots arranged according to a second plurality of rows, the second plurality of row being orientated in a second direction and comprising a second dot spacing. The first direction and the second direction define an angle of 45 degrees or less and a ratio of the second dot spacing to the first dot spacing is less than one.

Generating halftones

A color input image comprising a plurality of pixels, each pixels encoded in RGB color space, is processed to convert the RGB pixels to another color space domain for printing the color input image. The number of colors within a cell of the input image is reduced. Each cell comprises an N&#xd7;M array of pixels and the number of colors is reduced to a maximum of b source colors, wherein b is a positive integer equal to or greater than 2. Each of the resulting colors of each cell is calibrated to generate a printable color. The cells are then processed to convert the pixels of each cell into another color space, for example, to determine ink vectors, in another color space, for each calibrated color.

Image processing that includes reducing a number of colors within a cell of an image

Access requests () that are to be scheduled to an information storage system () include realtime access requests and non-realtime access requests. The realtime access requests are associated with respective completion deadlines. Pending ones of the access requests () that are awaiting submission to the information storage system () are received. Outstanding ones of the access requests () that have been submitted to the information storage system () and are awaiting completion by the information storage system () are tracked. The pending access requests are submitted to the information storage system () based on rules that prioritize the submission of pending access requests such that realtime ones of the pending access requests and realtime ones of the outstanding access requests will be serviced by the information storage system () by their associated completion deadlines.

Scheduling realtime information storage system access requests

Color image data is compressed by determining the number of colors within a cell of an input image, each cell comprising an N&#xd7;M array of pixels; in response to determining that the number of colors is greater than a first predetermined threshold, compress the cell using lossy compression; and in response to determining that the number of colors is less than the first predetermined threshold, reduce the number of colors.

Color image data compression

A method of storage access scheduling for a memory device for a workload of different priority access requests including access requests having a real-time priority. The method includes characterizing the memory device including determining a balanced number (N) of concurrent access requests associated with a concurrent access maximum throughput associated with the memory device. The method also includes characterizing the workload. The method also includes receiving a real-time access request associated with an access request storage location value. The method also includes processing the real-time access request, utilizing a processor, based on the access request storage location value and the values obtained from characterizing the memory device and the workload.

Concurrent request scheduling

Automated inspection method for detecting a defect in a printed image, comprising processing a raster image, sending the raster image to a print process, printing a printed image corresponding to the raster image onto a medium, capturing a target image from at least a part of the printed image at a lower resolution than the printed image, at least in a medium moving direction, converting at least a part of the raster image to a reference image, and comparing the reference image to the target image.

Automated inspection of a printed image

A method for pre-print enhancement of a raster image is disclosed. The method includes

Pre-print enhancement of a raster image

Growing community of inventors

Modiin, Israel

Ram Dagan