Abstract: The present invention provides a light field display device (300) comprising an array of light field display elements (310) populating a display surface, each display element (310) comprising: a beam generator (522) for generating an output beam of light; a radiance modulator (524) for modulating the radiance of the beam over time; a focus modulator (530) for modulating the focus of the beam over time; and a scanner (504, 506) for scanning the beam across a two-dimensional angular field.

Abstract: A tracking device (6) for controlling the focus of electroactive spectacles (2), the spectacles (2) comprising electroactive lenses (24, 26), the tracking device (6) comprising: a tracking camera (14), a tracking controller (18), and a transmitter (20); wherein the tracking controller (18) is configured to: capture, via the tracking camera (14), an image (16); detect, in the image (16), a pair of eyes; determine, from the image of the eyes, a target focus; and transmit, via the transmitter (20), a focus message (4) to the spectacles (2), the focus message (4) being indicative of the target focus, and instructive to the spectacles (2) to set the focus of the lenses (24, 26) accordingly.

Abstract: A method of providing information to a user via a printed substrate. The substrate chas a graphic image and coded data indicative of a region identity associated with the substrate and of a plurality of locations on the substrate. The method includes the steps of: (i) receiving interaction data indicative of the region identity and a position of a sensing device relative to the image; (ii) identifying and retrieving a page description corresponding to the printed substrate using the region identity; (iii) generating a query expression including search terms; (iv) forming a request using the query expression; and sending the request to the user. At least one of the search terms is associated, in the page description, with a zone of the graphic image containing the position of the sensing device.

Abstract: A process for decoding coded data is provided. The coded data has a plurality of layouts which each have order n (at least two) rotational symmetry and encode a codeword of a sequence of n symbols distributed at n locations about a center of rotational symmetry of the respective layout such that decoding the symbols at each of the n orientations of the layout produces n representations of the codeword. Each representation is a different cyclic shift of the codeword and is indicative of the degree of rotation of the layout. The process involves, at the computer system, identifying a layout from an image including the coded data, decoding the identified layout to determine a codeword representation, and determining a degree of rotation of the layout from the determined representation.

Abstract: A camera system for outputting deblurred still images includes a portable handheld camera device comprising an image sensor for recording an image; a two-dimensional accelerometer for detecting an angular velocity of the camera system relative to an external environment and to produce an angular velocity output indicative thereof; a linear image sensor for sensing data provided on an encoded card inserted into the camera system, the encoded card containing instructions for the manipulation of the image; and a processor for receiving the image from the image sensor, receiving the angular velocity output from the two-dimensional accelerometer, and processing the image in accordance with the instructions sensed from the encoded to deblur any blurred pixels present in the image in consideration of the angular velocity output.

Abstract: A sensing device is provided with an image sensor for capturing images of coded data disposed on a surface, a framestore for storing frames of the captured image as image data, subsampling means for subsampling the stored image date to generate subsampled image data, and an image processor for processing the subsampled image data to generate interaction data based on the sensed coded data and indicative of interaction of the sensing device with the surface. The image processor is integrated on a monolithic integrated circuit, the monolithic integrated circuit including a first subsampled framestore for storing the subsampled image data based on image data from the framestore.

Abstract: A system for controlling movement of a cursor on a display device, the system comprising: a substrate having a position-coding pattern disposed on or in a surface thereof; a sensing device comprising: an image sensor for optically imaging the position-coding pattern; and a processor configured for: generating absolute motion data by determining a plurality of absolute positions of the sensing device relative to the surface using the imaged position-coding pattern; generating orientation data indicative of an orientation of the sensing device relative to the substrate; and using the orientation data to translate the absolute motion data into relative motion data, said relative motion data being indicative of relative motion of the sensing device from the perspective of a user; and communication means for communicating the relative motion data to a computer system; and the computer system configured for: receiving said relative motion data from the sensing device; interpreting said relative motion data as curso

Abstract: An electronic pen having a retractable nib for interacting with a surface. The pen comprises a slidably movable cartridge having a nib for contacting the surface, a retraction mechanism for retracting the cartridge, an actuator coupled to the retraction mechanism, a force sensor providing a reaction to an axial force transmitted from the cartridge, and a processor configured for generating force data indicative of a force detected by the force sensor. The retraction mechanism comprises a barrel for receiving the cartridge, which is adapted for seating the cartridge in either an extended position or a retracted position, whereby the axial force from the cartridge is transmitted to the barrel in the extended position. A biasing mechanism biases the cartridge towards the extended or retracted positions.

Abstract: A method of decoding a coding pattern disposed on or in a substrate. The method comprises the steps of: (a) operatively positioning an optical reader relative to a surface of the substrate; (b) capturing an image of a portion of the coding pattern, the coding pattern comprising a plurality of square tags of length/identifying two-dimensional location coordinates; and (c) sampling and decoding x-coordinate data symbols within the imaged portion and y-coordinate data symbols within the imaged portion. The imaged portion has a predetermined diameter and is guaranteed to contain sufficient data symbols from each of the Reed-Solomon codes so that symbol errors are correctable in each of the codes during the decoding.

Abstract: A method of searching a database containing documents with handwritten annotations stored in association with document content is disclosed. The method receives as inputs a handwritten annotation as a handwritten search input and a content element as a content search input. A search is then performed of the database for handwritten annotations in a document matching the handwritten search input and less than a given physical distance from document content equal to the content search input in the document.

Abstract: A substrate has disposed on a surface a coding pattern. The coding pattern includes a plurality of tags each comprising x-coordinate data and y-coordinate data. A y-axis is nominally defined as north-south and an x-axis is nominally defined as east-west. The coding pattern further includes a plurality of data elements contained in each tag. The x-coordinate data is represented by a first set of data elements and the y-coordinate data is represented by a second set of data elements. The first set of data elements includes two replications of the x-coordinate data, a first replication of the x-coordinate data positioned in a western half of said tag and a second replication of the x-coordinate data positioned in an eastern half of said tag. The first replication of the x-coordinate data is positioned within one tag distance of a second replication of x-coordinate data of an adjacent tag.

Abstract: A method of estimating a position of nib of a pen relative to an optical sensor removably mounted on the pen. The optical sensor captures at least two images of a coded surface when the nib contacts the coded surface. The images are captured with the nib at a same position on the coded surface and the pen at different orientations relative to the coded surface. From a perspective distortion of the coded surface in each image, an estimated rotation and viewing distance for each image are estimated, and from the estimated rotations and viewing distances, the position of the nib relative to the optical sensor is estimated.

Abstract: A method of recording a transaction relating to a security document is disclosed. Coded data portions are provided on the security document, with each coded data portion encoding an identity of the security document and part of a signature. The signature is a digital signature of the identity. A sensing device senses at least one coded data portion. From the coded data portion sensed by the sensing device a determined identity and a determined signature part are determined. The security document is authenticated using the determined identity and the determined signature part. Transaction data associated with the security document, stored in a data store, is updated upon successful authentication.

Abstract: A binding printer is provided which has a media transport assembly configured to transport individual sheets of media along a media path, a printhead assembly configured to print on the sheets transported along the media path, and a binding assembly configured to bind together the printed sheets transported along the media path. The binding assembly has a binding platen configured to press each printed sheet transported onto a support platen to preceding sheets supported on the support platen to bind the printed sheets together, and a chassis defining an inlet for receiving the transported printed sheets and an exit hatch from which the bound printed sheets are removable.

Abstract: A substrate having a coding pattern disposed on a surface thereof. The coding pattern includes a plurality of macrodots encoding Reed-Solomon codewords. Each codeword contains Reed-Solomon data symbols and Reed-Solomon redundancy symbols. The coding pattern encodes the symbols using mixed multi-pulse position modulation.

Abstract: A method of generating half tone print data is disclosed. The method starts by determining an extent of overlap caused by temperature variations of overlapping end portions of a pair of consecutive printhead segments. A dither value is also generated from a dither matrix, and the dither value is combined with the extent of overlap to produce an output value. A mathematical operation is performed on continuous tone print data based on the output value, to produce the half tone print data.

Abstract: An object has first coded data and a random pattern disposed on a surface thereof. The first coded data identifies a plurality of fiducials on the surface and the random pattern defines a fingerprint for the object. The random pattern is defined by a taggant randomly dispersed in ink printed on the surface. A data reader for reading the first coded data and random pattern includes first and second optical sensors.

Abstract: An electronic pen for interacting with a surface. The pen comprises a cartridge having a nib for contacting the surface, a capacitive force sensor cooperating with said cartridge for sensing a nib force transmitted axially through the cartridge, and a processor configured to generate force data indicative of a force detected by the force sensor. The capacitive force sensor comprises: a spring having an integral conductive moving plate resiliently biased towards a reference position, a conductive fixed plate and a dielectric separating said plates.

Abstract: A printer system includes a printer and a printing consumable detachably mounted on the printer. The printer has a first integrated circuit which generates a random number, reference information using the random number and a secret key. The printing consumable has a second integrated circuit which generates validation information using the random number and the secret key received from the first integrated circuit. The printer also has processing circuitry configured for receiving the reference information from the first integrated circuit; receiving the validation information from the second integrated circuit; and comparing the reference information and validation information so as to validate the printing consumable device for use with the printer.

Abstract: A print medium configured to be printed on by a pagewidth printhead in a print direction. The print medium includes: a laminar substrate defining first and second opposite faces; a data track containing first information encoded in accordance with a linear encoding scheme, the data track extending in a linear read direction across a portion of the first face of the print medium, the read direction being oriented at between 45 and 135 degrees with respect to the print direction; and a plurality of contiguous tags tiled across the laminar substrate. Each of the tags identifies second information and a two-dimensional coordinate position on the laminar substrate. Each of the tags is encoded in accordance with a second encoding scheme distinct from the linear encoding scheme. The information is indicative of the second information.