Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An incremental printer adapted to print an image in a series of swaths, comprising a sensor adapted to determine the height of a printed swath of the image by scanning the swath as it is printed, the printer being controlled to take into account the determined height when printing a subsequent swath of the same image.