Canon Kabushiki Kaisha

Cameron Murray Edwards

Eric Wai Shing Chong

Paul William Morrison

Ben Yip

Bin Liao

Eric Wai-Shing Chong

Albert Chang

Scott Bradley

Richard Ling

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.

Method of encoding and decoding calibration marker identifiers

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 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.

Calibration of projection systems

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 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.

Calibration feature masking in overlap regions to improve mark detectability

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 of compositing a plurality of graphic objects with a compositing buffer, is disclosed. The plurality of graphic objects forming a group is attenuated by group opacity and is composited from a top object to a bottom object. Based on a first mask and the group opacity, a second mask is generated. The first mask stores a remaining possible contribution for further graphic objects below and including the plurality of graphic objects. The plurality of graphic objects in a top down order is processed. In particular, for each graphic object of the plurality of graphic objects: (a) a contribution value for the graphic object using the second mask is determined, the contribution value representing a contribution of the graphic object to the compositing buffer; (b) a colour value of the graphic object is composited with the compositing buffer using the contribution value; and (c) the second mask is updated using the contribution value. The first mask is then updated using the second mask and the group opacity. The updated first mask is configured for further compositing of objects below the plurality of graphic objects.

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Clovelly, Australia

Cameron Murray Edwards