Canon Kabushiki Kaisha

Ben Yip

Cameron Murray Edwards

Peter Alleine Fletcher

Kieran Gerard Larkin

Paul William Morrison

Eric Wai Shing Chong

Takeshi Yazawa

Stephen James Hardy

Bin Liao

Scott Alexander Rudkin

Paul Joseph Ellis

Steven Parker

Son Thai

Richard Ling

A computer-implemented system and method of reproducing visual content are described. The method comprises capturing a reference image of a calibration pattern projected on a surface at an initial position and at an offset position, the offset position relating to a projection offset from the initial position by shifting the calibration pattern a predetermined amount; and determining, using the reference image, a spatial capture offset for the calibration pattern between the initial position and the offset position, the spatial capture offset measuring a spatial shift of the calibration pattern in the reference image. The method further comprises determining a scale using the spatial capture offset and the projection offset; decoding a portion of a captured image, the captured image including the visual content and the calibration pattern, to determine a position within the calibration pattern by applying the determined scale, and reproducing the visual content based on the determined position.

Method and system for reproducing visual content

A method of aligning two portions of an image, the portions being projected by projectors on a surface to form respective projected portions of the image, a calibration pattern being embedded in each of the two portions, the method comprising capturing from the surface an image of the pattern from the projected portions, the calibration pattern extending across a combined projection area of the projectors; locating an overlap area according to locations of calibration points; determining projector image coordinates dependent upon locations in the overlap area; and aligning the two portions of the image according to the locations of control points and the locations in the overlap area.

Multi-projector alignment refinement

A method for determining the distance from a tip of a pointer to a surface using a light source and a single camera, the method comprising detecting in an image captured by the camera a tip of the pointer, determining in the image captured by the camera the intensity of a set of pixels below the tip of the pointer, the intensity defining a reflection by the surface of the tip of the pointer illuminated by the light source, and determining the distance from the tip of the pointer to the surface depending upon the intensity of the set of pixels below the tip of the pointer and an intensity of pixels of the tip of the pointer in the image.

Touch system and method for determining the distance between a pointer and a surface

A method () is described of determining characteristic of an ink jet printer (). A chart containing multiple regions or patches is printed () on a print medium () using the ink jet print (). The chart includes at least a first region printed using a first set of nozzles, and at least a second region printed using a second set of nozzles. The first and second sets of nozzles are a predetermined distance apart in the printer head of the printer (). The printing of the first and second regions is also separated by a print medium advance operation equal to the predetermined distance. This causes the first and second regions to be aligned in the direction of the print medium advance operation. The chart is then imaged using scanner () chart to form a chart image. The positions of the regions appearing in the chart image are next determined (). The spatial alignment characteristic of the printer is calculated from the distance, in the medium advance direction, between said first and second regions.

Method of measuring printer characteristics

Methods, apparatuses, systems and computer program products for measuring spatial characteristics of an inkjet printer are disclosed. Group of marks of a first predetermined pattern are printed on a print medium using a first group of nozzles. Groups of marks of a second predetermined pattern are printed using a second group of nozzles. A region of overlap of the printed groups of marks is formed. At least a portion of the print medium having printed groups of marks is imaged. From the region of overlap, first and second groups of marks from the first and second printed patterns are selected. For each group of marks, a position representative of that group is determined. An offset for measuring spatial characteristics of the printer between the first and second printed patterns is determined dependent upon the representative position of each of the first and second groups of marks.

Method of measuring printer spatial characteristics

Disclosed are methods () and apparatuses () for determining a location of a graphical object () printed onto a print medium (), said graphical object comprising a plurality of object marks, the method comprising the steps of superposing a two-dimensional reference pattern () having a pre-defined degree of accuracy over the printed graphical object, the two-dimensional reference pattern comprising a plurality of pattern marks (); scanning the superposed printed graphical object and reference pattern to produce a scanned image (); determining a location coordinate () of the graphical object in the scanned image (); and refining the location coordinate dependent upon the scanned reference pattern to determine a reference pattern coordinate (') associated with the location coordinate (). Also disclosed are methods (), apparatuses, and computer program products for determining a head size () of a print head () of a printer () using the aforementioned method.

Growing community of inventors

Ryde, Australia

Ben Yip