Abstract: A frame for a low parallax imaging device includes a plurality of interconnected faces configured to mount cameras. The faces are mounted along peripheral edges using kinematic connections. The frame provides a structure on which the mounted cameras provide a combined field of view of up to about 360-degrees with minimal parallax between adjacent cameras.

Abstract: A low parallax imaging device includes a plurality of imaging lens elements arranged to capture adjacent fields of view. In some examples, adjacent imaging lens elements may contact at datum features to maintain a desired spacing. The spacing may allow for partial overlapping of low-parallax volumes associated with the respective imaging lens elements.

Abstract: This application generally describes an imaging system, such as a multi-camera imaging system. The imaging system can include a plurality of channels and individual of the channels can include an objective lens and a relay optical system. The object lens images received light on a first image plane, as a first image, and the relay optical system images the first image on a second image plane, as a second, magnified image. In examples, the object lens and the relay optical system make up an optically coherent system.

Abstract: A web-guiding system for guiding a web of media along a transport path including a web-guiding roller located in proximity to a fixed web-guiding structure having a pattern of air holes formed through its exterior surface. The web of media travels around the web-guiding roller with the web of media contacting the web-guiding roller through a wrap angle of less than 5 degrees, and travels around the fixed web-guiding structure through a wrap angle of more than 10 degrees. An air source provides an air flow through the air holes formed lifting the web of media away from the web-guiding structure such that the web of media is substantially not in contact with the web-guiding structure.

Abstract: A method for correcting color registration errors for a print job including one or more documents having a plurality of color planes. A color registration error model is used to predict a color registration error value for a document as a function of ink coverage characteristics for the document, wherein the color registration error model is a parametric model having one or more parameters. An image plane correction value is determined based on the predicted color registration error, and the document is printed using the determined image plane correction value.

Abstract: A method for correcting color registration errors for a color printer that prints color image data on a continuous web of media. A color registration error model is used to predict a color registration error value for a particular in-track position as a function of ink coverage characteristics for an image region including the particular in-track position, wherein the color registration error model is a parametric model having one or more parameters. An image plane correction value is determined based on the predicted color registration error, and the color image data for the particular in-track position is printed using the determined image data correction values.

Abstract: A method for printing an image on a substrate, the method including the steps of providing a plurality of rollers for moving a substrate on which the image is printed; depositing a plurality of different colored inks on a print side of the substrate which form the image; depositing clear liquid on the non-print side of the substrate in a predetermined pattern for permitting the substrate to have uniform substrate growth.

Abstract: A media-guiding system includes a media-guiding roller having a roller axis and an exterior surface having one or more grooves formed around the exterior surface. A media travels along a transport path past the media-guiding roller with a first side of the media facing the exterior surface of the web-guiding roller. An air source provides an air flow into one or more of the grooves, the air flow being directed between the first side of the media and the exterior surface of the media-guiding roller thereby producing a Bernoulli force to draw the media toward the exterior surface of the media-guiding roller and providing an increased traction between the media and the media-guiding roller.

Abstract: A web-guiding system for guiding a web of media along a transport path including a web-guiding roller located in proximity to a fixed web-guiding structure having a pattern of air holes formed through its exterior surface. The web of media travels around the web-guiding roller with the web of media contacting the web-guiding roller through a wrap angle of less than 5 degrees, and travels around the fixed web-guiding structure through a wrap angle of more than 10 degrees. An air source provides an air flow through the air holes formed lifting the web of media away from the web-guiding structure such that the web of media is substantially not in contact with the web-guiding structure.

Abstract: A media-guiding system includes a media-guiding roller having a roller axis and an exterior surface having one or more grooves formed around the exterior surface. A media travels along a transport path past the media-guiding roller with a first side of the media facing the exterior surface of the web-guiding roller. An air source provides an air flow into one or more of the grooves, the air flow being directed between the first side of the media and the exterior surface of the media-guiding roller thereby producing a Bernoulli force to draw the media toward the exterior surface of the media-guiding roller and providing an increased traction between the media and the media-guiding roller.

Abstract: A method for printing an image on a substrate, the method including providing a plurality of rollers for moving a substrate on which the images are printed; depositing a plurality of different colored inks on a print side of the substrate which forms the image; depositing a clear liquid on the print side of the substrate in a linear, spaced apart pattern adjacent an edge of the image for forming clear liquid ribs; wherein the clear liquid ribs extend away from the image, and the clear liquid is devoid in at least at a plurality of portions between the clear liquid ribs.

Abstract: A web-guiding system for guiding a web of media travelling from upstream to downstream along a transport path in an in-track direction. A web-guiding structure includes an exterior surface having a pattern of alternating ridges and recesses formed into the exterior surface. The web of media travels past the web-guiding structure with the first side of the web of media contacting at least some of the ridges on the exterior surface of the web-guiding structure. The ridges and recesses are formed into the exterior surface of the web-guiding structure such that the exterior surface has a continuous and smooth surface profile in the cross-track direction having a specified maximum slope magnitude and a specified minimum radius of curvature magnitude.

Abstract: A method for performing color-to-color correction while printing multiple copies of a print job having one or more documents includes printing one or more copies of the print job and determining at least one color registration error for at least one type of color registration error produced during the printing of the one or more copies of the print job. A color plane correction value is then determined for each document in the print job and for each color plane error produced during the printing of the one or more copies of the print job. One or more subsequent copies of the print job is printed using the color plane correction values, where the color plane correction values used for each document are the correction values determined for that document. The color plane correction values can be updated periodically, at select times, or after each copy is printed.

Abstract: A web-guiding system for guiding a web of media along a transport path comprising a drive roller rotated by a motor and a plurality of nip rollers. The drive roller includes a first section, a second section and a third section along the length of the roller, the second section being located between the first section and the third section. A diameter of a surface envelope around the exterior surface of the drive roller is substantially constant within the second section, and is larger in the first section and the third section than in the second section. The nip rollers are aligned with the second section of the drive roller, with the web of media passing between the drive roller and the nip rollers.

Abstract: A wrinkle-reduction system includes two media guiding rollers located in proximity to first and second edges of a media, each media guiding roller having a corresponding roller axis and having one or more grooves formed around its exterior surface. The media travels along a transport path past the media-guiding rollers with a first side of the media facing the exterior surface of the web-guiding rollers. Air sources provide an air flow into the grooves in the media-guiding rollers, the air flow being directed between the first side of the media and the exterior surface of the media-guiding rollers thereby producing a Bernoulli force to draw the media toward the media-guiding rollers. The first roller axis is not parallel to the second roller axis such that when the air sources are activated the media guiding rollers impart a lateral stretching force to the media in the cross-track direction.

Abstract: A method for performing color-to-color correction for printing multiple copies of a print job having one or more documents is disclosed. A first copy of the print job is printed using a plurality of color planes. A first plurality of color registration errors produced during the printing of the first copy of the print job is determined. For each document in the print job, a processor is used to determine a first plurality of local color plane correction values for each color registration error produced during the printing of the first copy of the print job. Each of the first plurality of local color plane correction values corresponds to one of the first plurality of color registration errors. A second copy of the print job is printed using the local color plane correction values for each document in the print job.

Abstract: Methods and systems for performing color-to-color correction for printing multiple print jobs comprise receiving a first print job, wherein the first print job has one or more documents, receiving a second print job, wherein at least a portion of one of the documents in the second print job is different from a corresponding document in the first print job, and printing a copy of the first print job. One or more processors are used to determine a plurality of color plane registration errors produced during the printing of the copy of the first print job, local color plane correction values based on the plurality of color registration errors, and a difference between the corresponding documents in the first print job and second print job. When the amount of difference is less than a predetermined threshold, the local color plane correction values are used to print the second print job.

Abstract: A method for performing color-to-color correction for printing multiple copies of a print job having one or more documents is disclosed. A first copy of the print job is printed using a plurality of color planes. A first plurality of color registration errors produced during the printing of the first copy of the print job is determined. For each document in the print job, one or more processors are used to determine a global color plane correction value for each color plane error based on the first plurality of color registration errors. The global color plane correction values are adjusted locally based on the first plurality of local color plane correction values. A second copy of the print job is printed using the locally adjusted global color plane correction values for each document in the print job.

Abstract: A printing system for printing multiple copies of a print job having one or more documents is disclosed. A plurality of printheads prints each of a plurality of color planes of a first copy of the print job. One or more processors determine a first plurality of color registration errors produced during the printing of the first copy of the print job. Global color plane correction values for each document of the print job are determined. The global color plane correction values are adjusted locally for each document based on the first plurality of local color plane correction values. The plurality of printheads prints a second copy of the print job using the locally adjusted global color plane correction values for each document in the print job.

Abstract: A method for performing color-to-color correction for printing multiple copies of a print job having one or more documents is disclosed. A first copy of the print job is printed using a plurality of color planes. A first plurality of color registration errors produced during the printing of the first copy of the print job is determined. For each document in the print job, a processor is used to determine a first plurality of local color plane correction values for each color registration error produced during the printing of the first copy of the print job. Each of the first plurality of local color plane correction values corresponds to one of the first plurality of color registration errors. A second copy of the print job is printed using the local color plane correction values for each document in the print job.