Abstract: An image registration system for determining a relative location of a first pattern and a second pattern includes a fiducial having a fiducial origin, a first side, and a second side. A first camera captures a first fiducial image of the first side of the fiducial and the fiducial origin and a first pattern image of the first printed pattern. A second camera captures a second fiducial image of the second side of the fiducial and a second pattern image of the second printed pattern. An image registration controller processes the first fiducial image, the first pattern image, the second pattern image, and the second fiducial image to determine the relative location of the first pattern and the second pattern.

Abstract: A method of printing includes printing first and second patterns at first and second locations on first and second sides of a media using first and second printheads, respectively. First and second fiducial images including a fiducial origin are captured using first and second cameras, respectively. First and second pattern images of the first and second patterns are captured using the first and second cameras, respectively. The locations of the first and second patterns relative to the fiducial origin are determined using an image registration controller. A relative printed location of the first pattern and the second pattern is determined. A deviation is determined by comparing the determined relative location of the first and second printed patterns with an intended relative location of the first and second printed patterns.

Abstract: A printing system includes a media transport system and first and second printheads that print first and second patterns on first and second sides of the media, respectively. An image registration system includes a fiducial including an origin and first and second sides. A first camera captures a first fiducial image of the first side and origin and a first pattern image of the first pattern. A second camera captures a second fiducial image of the second side and origin and a second pattern image of the second pattern. A registration controller processes the first and second fiducial images and pattern images to determine a relative position of the first and second patterns. A print controller, controlling printhead operation, adjusts the registration of subsequently printed patterns on at least one of the first and second sides of the media based on the determined relative pattern position.

Abstract: A method of determining a relative location of a first pattern and a second pattern includes providing a fiducial including a fiducial origin, a first camera, a second camera, and an image registration controller. A first fiducial image of the fiducial origin is captured using the first camera. A second fiducial image of the fiducial origin is captured using the second camera. A first pattern image of a first pattern is captured using the first camera. A second pattern image of a second pattern is captured using the second camera. A first location of the first pattern relative to the fiducial origin is determined using the image registration controller. A second location of the second pattern relative to the fiducial origin is determined using the image registration controller. A relative location of the first location and the second location is determined using the image registration controller.

Abstract: A method for determining a variance of a sensor in inkjet printers comprising maintaining a printer carriage at a stationary position; illuminating a media patch of known characteristics with a light source that varies an intensity of the light between at least a first and second intensity, in which the second intensity is different from the first intensity; obtaining an amount of light transmitted through the media patch by measuring a signal from a photo-detector during the illumination; and comparing the amount of received light to stored target values to determine a variation of the sensor response for forming a correction factor; and using the correction factor to calibrate at least a first signal of the inkjet printer.

Abstract: A method for determining a variance of a sensor in inkjet printers includes maintaining a printer carriage at a stationary position; illuminating a media patch of known characteristics with a light source that varies an intensity of the light between at least a first and second intensity, in which the second intensity is different from the first intensity; obtaining at least specular reflectance data from light reflected off the print media by measuring a signal from a photo-detector during the illumination; and comparing the specular data to stored values to determine a variation of the sensor response for forming a correction factor; and using the correction factor to calibrate at least a first signal of the inkjet printer.

Abstract: A method of determining a relative location of a first pattern and a second pattern includes providing a fiducial including a fiducial origin, a first camera, a second camera, and an image registration controller. A first fiducial image of the fiducial origin is captured using the first camera. A second fiducial image of the fiducial origin is captured using the second camera. A first pattern image of a first pattern is captured using the first camera. A second pattern image of a second pattern is captured using the second camera. A first location of the first pattern relative to the fiducial origin is determined using the image registration controller. A second location of the second pattern relative to the fiducial origin is determined using the image registration controller. A relative location of the first location and the second location is determined using the image registration controller.

Abstract: A printing system includes a media transport system for transporting a media, a first printhead that prints a first pattern on a first side of the media, and a second printhead that prints a second pattern on a second side of the media. A print controller controls the operation of the first and second printheads. An image registration system includes a fiducial including a fiducial origin and first and second fiducial sides. A first camera captures a first fiducial image of the first fiducial side and origin and a first pattern image of the first pattern. A second camera captures a second fiducial image of the second fiducial side and origin and a second pattern image of the second pattern. An image registration controller processes the first and second fiducial images and the first and second pattern images to determine a relative position of the first and second patterns.

Abstract: An image registration system for determining a relative location of a first pattern and a second pattern includes a fiducial having a fiducial origin, a first side, and a second side. A first camera captures a first fiducial image of the first side of the fiducial and the fiducial origin and a first pattern image of the first printed pattern. A second camera captures a second fiducial image of the second side of the fiducial and a second pattern image of the second printed pattern. An image registration controller processes the first fiducial image, the first pattern image, the second pattern image, and the second fiducial image to determine the relative location of the first pattern and the second pattern.

Abstract: A method of printing includes printing first and second patterns at first and second locations on first and second sides of a media using first and second printheads, respectively. First and second fiducial images including a fiducial origin are captured using first and second cameras, respectively. First and second pattern images of the first and second patterns are captured using the first and second cameras, respectively. The locations of the first and second patterns relative to the fiducial origin are determined using an image registration controller. A relative printed location of the first pattern and the second pattern is determined. A deviation is determined by comparing the determined relative location of the first and second printed patterns with an intended relative location of the first and second printed patterns.

Abstract: An inkjet printer includes a printer carriage positioned on a first side of a platen and that moves across at least a portion of the platen; a light source positioned on a second side of the platen which second side is different from the first side; a sensor positioned on the printer carriage that detects an amount of light illuminated from the light source; an electronic device that receives data indicating the amount of light transmitted through a media patch with known characteristics; wherein the electronic device compares the amount of transmitted light to stored target values to determine a variation of the sensor response for forming a correction factor; wherein the electronic device uses the correction factor to calibrate at least a first signal of the inkjet printer.

Abstract: A method for determining a variance of a sensor in inkjet printers comprising maintaining a printer carriage at a stationary position; illuminating a media patch of known characteristics with a light source that varies an intensity of the light between at least a first and second intensity, in which the second intensity is different from the first intensity; obtaining an amount of light transmitted through the media patch by measuring a signal from a photo-detector during the illumination; and comparing the amount of received light to stored target values to determine a variation of the sensor response for forming a correction factor; and using the correction factor to calibrate at least a first signal of the inkjet printer.

Abstract: A method for determining a variance of a sensor in inkjet printers includes maintaining a printer carriage at a stationary position; illuminating a media patch of known characteristics with a light source that varies an intensity of the light between at least a first and second intensity, in which the second intensity is different from the first intensity; obtaining at least specular reflectance data from light reflected off the print media by measuring a signal from a photo-detector during the illumination; and comparing the specular data to stored values to determine a variation of the sensor response for forming a correction factor; and using the correction factor to calibrate at least a first signal of the inkjet printer.

Abstract: A printer that determines paper type includes one or more short and long wavelength radiation sources sequentially outputting a short wavelength radiation and a long wavelength radiation onto a paper that reflects the long wavelength radiation and the short wavelength radiation is absorbed by a fluorescent compound in the paper resulting in the emission of long wavelength fluorescent radiation; a first detector that detects a long wavelength fluorescence signal resulting from the short wavelength source and a reflectance signal resulting from the long wavelength source; and a lookup table that determines a paper type from a plurality of paper types based on the fluorescence signal and reflectance signals.

Abstract: A method for determining a type of paper and for determining printing parameters based on the type of paper, the method includes the steps of (a) illuminating a paper sequentially with an short wavelength radiation and a long wavelength radiation; detecting a fluorescence signal resulting from the short wavelength radiation and a long wavelength signal resulting from the long wavelength radiation; determining a paper type from a plurality of paper types based on the fluorescence signal and second long wavelength signal; and adjusting the printing parameters based on the determined paper type.

Abstract: A printer that determines paper type includes a first short and long wavelength radiation source located on a first side of paper which first radiation source sequentially outputs a short wavelength radiation and a long wavelength radiation onto the first side of the paper that reflects the long wavelength radiation and the short wavelength radiation is absorbed by the paper and emitted as long wavelength fluorescence radiation; one or more first detectors located on the first side of the paper and each detector detects a long wavelength fluorescence signal resulting from the short wavelength radiation source of the first radiation source and a reflectance signal resulting from the long wavelength radiation source of the first short and long wavelength radiation source; a second short and long wavelength radiation source located on a second side of the paper which second short wavelength and long wavelength radiation source sequentially outputs a short wavelength radiation and a long wavelength radiation onto

Abstract: A printer that determines paper type includes one or more light sources sequentially outputting a short wavelength radiation and a long wavelength radiation onto a paper that transmits the long wavelength radiation and the short wavelength radiation is absorbed by a fluorescent compound in the paper resulting in the emission of long wavelength fluorescent radiation; a first detector that detects a long wavelength fluorescence signal resulting from the short wavelength source and a transmittance signal resulting from the long wavelength source; and a lookup table that determines a paper type from a plurality of paper types based on the fluorescence signal and transmittance signals.

Abstract: An inkjet printer includes a paper tray for holding print media; a pick-up roller for moving the print media along at least a portion of a pre-print zone of a paper transport path; a light source disposed along the pre-print zone of the paper transport path that directs light toward a non-print side of the print media for illuminating the non-print side of the print media; and an array sensor that receives reflected light from the non-print side of the print media; wherein data from the sensor is used to determine an amount of motion of the print media in the pre-print zone.

Abstract: An apparatus (20) forms a latent indicium onto a sensitized medium, using an area energy source (26) for applying a substantially uniform sensitizing energy over an area of the sensitized medium and a pixel exposure source (30) for applying radiant energy to expose a pattern of pixels (14) onto the area of the sensitized medium for forming the indicium.

Abstract: A focus detection device includes an image sensor and a plurality of lenslets. Each of the plurality of lenslets has a distinct conjugate length and is associated with a distinct portion of the image sensor.