Hewlett-packard Development Company, L.p.

Santiago Reyero

Joan Manuel Garcia

Yu-Hsuan Lin

Alejandro Manuel De Pena

Francesc Subirada

Andrew Mackenzie

Cesar Fernandez

Andreu Gonzalez

Robert F Little

Elissa Melor Berver

Jose M Galmes

An example calibration device includes a projector to project a first image onto a touch screen. The first image includes a first set of four corner coordinates. A processor is to perform a first perspective transformation of the first image into a second image for projection onto the touch screen by the projector. The second image includes a second set of four corner coordinates. The processor is to receive at least one touch signal associated with a second set of four corner coordinates associated with the second image from the touch screen. The processor is to perform a second perspective transformation of the second image using the second set of four corner coordinates to resize the second image based on the first set of four corner coordinates.

Perspective transformation of images via touch signals

A method for preparing a mask for multi-pass printing, comprises determining a characteristic satellite drop spray pattern for printing in a multi-pass mode with a printhead. Positions in the mask are filled with pass numbers. The pass numbers in a given position are selected based on considerations of interactions among main drops and satellite drops.

Method for preparing a print mask

A technique for assessing nozzle health of a printhead nozzle array in a printing system includes printing a swath portion of an image, optically scanning the printed swath portion to capture a scanned image, comparing an expected image of the swath portion of the image with the scanned image, and assessing whether any nozzles of the nozzle array have malfunctioned. A sensor can be mounted on a printhead carriage to accomplish the image capture.

Method and apparatus for assessing nozzle health

Exemplary embodiments of the invention include methods of adjusting the print resolution of an inkjet printhead having a region of poor performance such that printing occurs outside the region of poor performance. Exemplary embodiments also include systems utilizing the methods.

Method of adjusting printing resolution to avoid conditions of poor pen performance in an inkjet printing system, and systems

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San Diego, CA, United States of America

Santiago Reyero