Abstract: A method of generating an image, the method including receiving a two-dimensional pattern in the frequency domain, modifying one or more peripheral properties of the two-dimensional pattern and generating the image based on the modified two-dimensional pattern.

Abstract: A method of generating an image, the method including receiving a two-dimensional pattern in the frequency domain, modifying one or more peripheral properties of the two-dimensional pattern and generating the image based on the modified two-dimensional pattern.

Abstract: 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.

Abstract: A method of generating an improved warp map for a projection on a non-planar surface. An initial warp map of the projection on the non-planar surface captured by a camera is received, the projection being formed on the non-planar surface using a projector and the initial warp map. A plurality of regions on the non-planar surface is generated, each of the plurality of regions having a size and location determined from a measure of flatness for the region based on the initial warp map. An unwarped image of a calibration pattern projected on the non-planar surface is determined by applying an inverse transform to each of the plurality of regions on the non-planar surface, each transform mapping pixels of the projection to pixels of the camera according to the initial warp map. A plurality of locations in the determined unwarped image of the calibration pattern is determined to generate the improved warp map.

Abstract: A method for calibrating a projection system having a plurality of projectors, and a camera. The method comprises the camera capturing an image of a calibration pattern projected on to a projection surface by a first projector of the plurality of projectors; determining a projective reconstruction using corresponding points between pixels in the captured image and pixels in the projected calibration pattern; and determining a set of solutions for intrinsic parameters of the first projector, the set of solutions converting the projective reconstruction to a Euclidean reconstruction based on minimization of reprojection error between the camera and the first projector. The method also comprises determining intrinsic parameters of the first projector by selecting the intrinsic parameters from the set of solutions according to a reprojection error with respect to another projector; and applying the selected intrinsic parameters to determine a Euclidean reconstruction of the projection surface.

Abstract: A method for calibrating a projection system having a plurality of projectors, and a camera. The method comprises the camera capturing an image of a calibration pattern projected on to a projection surface by a first projector of the plurality of projectors; determining a projective reconstruction using corresponding points between pixels in the captured image and pixels in the projected calibration pattern; and determining a set of solutions for intrinsic parameters of the first projector, the set of solutions converting the projective reconstruction to a Euclidean reconstruction based on minimisation of reprojection error between the camera and the first projector. The method also comprises determining intrinsic parameters of the first projector by selecting the intrinsic parameters from the set of solutions according to a reprojection error with respect to another projector; and applying the selected intrinsic parameters to determine a Euclidean reconstruction of the projection surface.

Abstract: 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.

Abstract: 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.

Abstract: Disclosed is a method of determining characteristics of a printer, the method comprising the steps of receiving print data, defining dot locations to be printed on a print medium, determining from the dot locations a dot frequency measure reflecting the number of dots to be printed on at least a part of the print medium, forming a simulated reference image of the print data comprising simulated dots corresponding to the dot locations in the print data, determining a size of the simulated dots in the reference image, this size being inversely related to the dot frequency measure, printing the print data on the print medium using the image forming apparatus to form a printed image, and determining characteristics of the image forming apparatus by comparing the printed image and the simulated reference image.

Abstract: 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.

Abstract: Method, system and calibration marker for calibrating a three-dimensional printer. The method includes the steps of providing an image of a calibration marker to the three-dimensional printer; forming a calibration marker based on the provided image by depositing toner material on a first substrate of the printer, the calibration marker having a feature size and being fully interconnected to impart structural integrity to the calibration marker, and having annular spectral energy concentrated at a radius determined by the feature size of the calibration marker, wherein the interconnectedness and feature size of the calibration marker enables the structural integrity of the calibration marker to be maintained during transfer; transferring the formed calibration marker from the first substrate to a second substrate of the printer; and calibrating the printer from a determination of distortion introduced to the calibration marker during the forming and the transferring of the calibration marker.

Abstract: A method of displaying an image using at least a first projector and a second projector includes projecting a calibration pattern using the first projector, the calibration pattern being embedded in a first portion of an image projected by the first projector. The method determines a contribution of the second projector to projecting a second portion of the image to an overlap area, the overlap area having a contribution from the first and second projectors, wherein the contribution is an intensity of a color channel. The determined contribution of the second projector to the overlap area is modified to allow the calibration pattern of the first projector to be detectable to a capture device, the modification having a pattern corresponding to the calibration pattern. The image is then displayed using the first projector and the modified contribution of the second projector.

Abstract: Disclosed is method of measuring the displacement between a reference region of a reference image and a sample region of a sample image. The method spatially varies the reference region using a one-dimensional filter having complex kernel values, wherein a length (radius) and direction (angle or tangent segment) of the filter is a function of position in the reference region. The method then measures a displacement between the reference region and the sample region by comparing the spatially varied reference region and the sample region.

Abstract: A method of selecting a plurality of patches (e.g., 1040) within a region of a page (e.g., 1010), for use in image alignment, is disclosed. One or more candidate image alignment patches distributed across a region of the page are determined, based on content in the page region, each candidate patch being associated with a feature strength value. A distribution of grid nodes is applied to the page region, at least one attribute of the distribution of grid nodes being dynamically adjusted according to the distribution of the candidate patches across the page region. A corresponding patch from the distribution of candidate patches is selected for each of a plurality of the grid nodes, wherein each of the selected patches is selected based on proximity of the selected patch to a corresponding grid node.

Abstract: Disclosed is a method of determining characteristics of a printer, the method comprising the steps of receiving print data, defining dot locations to be printed on a print medium, determining from the dot locations a dot frequency measure reflecting the number of dots to be printed on at least a part of the print medium, forming a simulated reference image of the print data comprising simulated dots corresponding to the dot locations in the print data, determining a size of the simulated dots in the reference image, this size being inversely related to the dot frequency measure, printing the print data on the print medium using the image forming apparatus to form a printed image, and determining characteristics of the image forming apparatus by comparing the printed image and the simulated reference image

Abstract: Disclosed is a method of classifying segmented contents of a scanned image of a document. The method comprise partitioning the scanned image into color segmented tiles at pixel level. The method then generates superpositioned segmented contents, each segmented content representing related color segments in at least one color segmented tile. Statistics are then calculated for each segmented content using pixel level statistics from each of the tile color segments included in segmented content, and then determines a classification for each segmented content based on the calculated statistics. The segmented content may be macroregions. The macroregions may form part of a multi-layered document representation of the document.

Abstract: A method (1100) of creating a document comprising a modifiable shape, is disclosed. The method analyzes an image to detect at least a graphical object. The method matches the detected graphical object with at least one of a plurality of predetermined modifiable closed-form non-textual template shapes (e.g., 420) comprising control parameters for modifying the closed-form non-textual template shape in a non-affine manner. The number of control parameters of the predetermined modifiable closed-form non-textual template shape is less than the number of sections making up the modifiable closed-form non-textual template shape. The method creates a document comprising the at least one modifiable closed-form non-textual template shape.

Abstract: A method (100), an apparatus, and a computer program product for automatically producing a compact representation of a colour document are disclosed. In the method, a digital image of a colour-document page is segmented (110) into connected components in one-pass, block raster order. The digital image of the page is partitioned into foreground and background images using layout analysis (120) based on compact, connected-component statistics of the whole page. At least one portion of the background image where at least one portion of the foreground image obscures the background image is inpainting (520) in one-pass block raster order. The foreground and background images are combined (130) to form a compact document. A method, an apparatus, and a computer program product for segmenting a digital image comprising a plurality of pixels are also disclosed.

Abstract: A method (1100) of creating an editable document is disclosed. The method analyses a bitmap image to detect at least one bit map representation of a graphical object and a bitmap representation of a line object. The method matches the graphical object with one of a plurality of predetermined template shapes (e.g., 420), the template shape having one or more predetermined non-contiguous connection points. The method selects one of the predetermined connection points for the line object if at least one end of the line object is within a predetermined distance of the selected connection point and associates the line object with the selected connection point. The method creates an editable document comprising the template shape with the line object connected thereto, wherein the line object remains associated with the selected connection point upon the template shape being modified within the document such that the line object remains dynamically connected to the template shape.

Abstract: Disclosed is a method (100) for detecting print errors, the method comprising printing (130) a source input document (166) to form an output print (163), imaging (140) the output print (163) to form a scan image (164), determining a set of parameters modelling characteristics of the printer used to perform the printing step, determining values for the set of parameters dependent upon operating condition data for the printer, rendering (120) the source document (166), dependent upon the parameter values, to form an expected digital representation (227), and comparing (270) the expected digital representation to the scan image to detect the print errors