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US20060028674A1 - Printer with user ID sensor - Google Patents

Printer with user ID sensor Download PDF

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Publication number
US20060028674A1
US20060028674A1 US11/193,479 US19347905A US2006028674A1 US 20060028674 A1 US20060028674 A1 US 20060028674A1 US 19347905 A US19347905 A US 19347905A US 2006028674 A1 US2006028674 A1 US 2006028674A1
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United States
Prior art keywords
printer
user
token
reader
computer network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/193,479
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English (en)
Inventor
Paul Lapstun
Kia Silverbrook
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Silverbrook Research Pty Ltd
Original Assignee
Silverbrook Research Pty Ltd
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Filing date
Publication date
Priority claimed from AU2004904325A external-priority patent/AU2004904325A0/en
Application filed by Silverbrook Research Pty Ltd filed Critical Silverbrook Research Pty Ltd
Assigned to SILVERBROOK RESEARCH PTY LTD reassignment SILVERBROOK RESEARCH PTY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAPSTUN, PAUL, SILVERBROOK, KIA
Publication of US20060028674A1 publication Critical patent/US20060028674A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0093—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G06F3/013—Eye tracking input arrangements
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0317—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
    • G06F3/0321—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/344—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] with head-mounted left-right displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0179—Display position adjusting means not related to the information to be displayed
    • G02B2027/0187—Display position adjusting means not related to the information to be displayed slaved to motion of at least a part of the body of the user, e.g. head, eye

Definitions

  • the present invention relates to printing systems, and in particular printing systems involving interactive paper, computer publishing, computer applications, human-computer interfaces, and information appliances.
  • documents to be printed are typically sent via local computer networks to one of a number of printers connected to the network.
  • the nominated printer is usually the most convenient to the user but unless the user goes to collect the document immediately after sending the print job, the printed document waits in the collection tray. If the document is sensitive, there is a risk that its contents will be disclosed to others passing the printer.
  • the present invention provides a computer network for a plurality of users, the computer network comprising:
  • Print jobs can be collected from the most convenient printer regardless of a users current location in the office.
  • the Netpage system is comprehensively described in the cross referenced documents as well as the Detailed Description below.
  • This system uses a paper- and pen-based interface to computer-based and typically network-based information and applications.
  • the user can request print jobs by ‘clicking’ an interactive element on a Netpage document with a Netpage pen and therefore may be remote from any of the networked printers or even the office when print jobs are requested.
  • According the invention is particularly suited to the Netpage system and will be described with particular reference to its operation within this environment. However, it will be appreciated that the invention has much broader application than Netpage and is not limited or restricted to printing Netpage documents.
  • the network comprises a plurality of said printers, each printer associated with one of the printer identifiers respectively;
  • each of the network user identifiers is a token and each of the printer identifiers has a token reader such that the user presents their token to the token reader associated with one of the printers to request actual printing of their queued printouts via that printer.
  • the tokens are a short-range RFID tag, a smartcard or a magnetic stripe card.
  • the token reader notifies a walk-up-handling application on the server of the user's proximity to the associated printer which in turn initiates printing.
  • each of the printer identifiers is a token and each of the network user identifiers has a token reader associated with the user.
  • the token reader is an electronic stylus with an optical sensor
  • the tokens are a surface each of the printers with coded data disposed on it, the coded data being readable by the optical sensors of each users' electronic stylus.
  • the pending printouts are maintained in a queue by the server and each pending printout has a priority such that higher-priority printouts are printed before earlier-queued but lower-priority printouts.
  • the token readers are associated with respective printers such that when the user presents their token to the reader it reads the token and identifies both the user and the printer to the server.
  • the token identfies the user explicitly.
  • the token has a token identifier and the server performs a database lookup to translate the token identifier into a user identity.
  • the token reader identifies the printer explicitly.
  • the reader has a reader identifier and the server performs a database lookup to translate the reader identifier into a printer indentity.
  • the token reader and the printer are separate devices which have an electrical connection.
  • the token reader is physically built into the printer.
  • the reader informs the printer that the user has presented a token and the printer then explicitly retrieves the user's pending printouts for printing.
  • the token is a security access or identification badge or card.
  • FIG. 1 shows the data flow between Netpage publishers and applications, Netpage services, and Netpage devices
  • FIG. 2 is a diagram of the range of content type within a Netpage document
  • FIG. 3 shows a Netpage document with a physical structure consisting of a sequence of numbered pages
  • FIG. 4 shows a printout consisting of a series of impressions
  • FIG. 5 is a diagram showing a user with a pen and default printer
  • FIG. 6 shows the pen events recorded in a digital ink stream
  • FIG. 7 shows the form data submitted to an application
  • FIG. 8 shows a dynamic element for use as a document element
  • FIG. 9 shows a dynamic object linked to an existing impression
  • FIG. 10 shows the relationship between the document, printout and digital ink stores
  • FIG. 11 shows the fundamental flow of data in the Netpage system in greater detail than FIG. 1 ;
  • FIG. 12 shows the data flow associated with reprinting impressions
  • FIG. 13 shows the data flow associated with printing
  • FIG. 14 shows a bifurcated general printing data flow
  • FIG. 15 shows the data flow associated with walk-up printing
  • FIG. 16 shows the data flow associated with the establishment of a printout queue
  • FIG. 17 shows the different levels of network distribution and access possible within the Netpage system
  • FIG. 18 shows the data flow if the user has a token read by a reader associated with the printer
  • FIG. 19 shows the data flow if the user has a reader for reading the token associated with the printer
  • FIG. 20 shows the data flow if the user has a reader that reads the printer token but then uses the printer reader to connect to the Netpage server;
  • FIG. 21 shows the data flow between a privately hosted network and a publicly hosted network
  • FIG. 22 shows a PC or device hosted Netpage system
  • FIG. 23 shows the structure of a complete tag
  • FIG. 24 shows a symbol unit cell
  • FIG. 25 shows nine symbol unit cells
  • FIG. 26 shows the bit ordering in a symbol
  • FIG. 27 shows a tag with all bits set
  • FIG. 28 shows a tag group made up of four tag types
  • FIG. 29 shows the continuous tiling of tag groups
  • FIG. 30 shows the interleaving of codewords A, B, C & D with a tag
  • FIG. 31 shows a codeword layout
  • FIG. 32 shows a tag and its eight immediate neighbours labelled with its corresponding bit index.
  • the invention is well suited for incorporation in the Assignee's Netpage system.
  • the invention has been described as a component of a broader Netpage architecture.
  • the invention is also applicable to other computer networks.
  • FIG. 1 shows the interaction between Netpage publishers, applications, services and devices.
  • the Netpage document service 1 accepts a document 2 from a Netpage publisher 3 or other Netpage application 4 , and produces a printout 5 via a Netpage printer 6 .
  • a printout 5 consists of a series of impressions on either or both sides of a series of paper sheets.
  • the printer 6 also lays down a coordinate grid in the form of an array of invisible millimetre-scale tags 7 (see U.S. Ser. No. 10/309,358 cross referenced above). Each tag encodes the two-dimensional coordinates of its location on the impression as well as the impression's unique identifier.
  • a tag When a tag is optically imaged by a Netpage pen 8 (see below and U.S. Ser. No. 10/815,636 cross referenced above) the pen is able to identify the corresponding impression as well as its own position relative to the impression.
  • the pen When the user of the pen 8 moves the pen relative to the coordinate grid 7 , the pen generates a stream of positions. This stream is referred to as digital ink 9 .
  • a digital ink stream also records when the pen makes contact with a surface and when it loses contact with a surface, and each pair of these so-called pen down and pen up events delineates a stroke drawn by the user using the pen.
  • the Netpage tag pattern 7 is typically printed using an invisible infrared ink while visible graphic content is printed using colored inks which are transparent in the infrared part of the spectrum.
  • the Netpage pen 8 incorporates a conventional marking nib which utilises an infrared-transparent ink so as not to obscure the tag pattern 7 .
  • impression identifiers tags
  • the document 2 may include an input description 11 which defines command and form data 12 .
  • the commands are instructions that may be activated by the user and the forms have designated fields that may be filled in by the user. Both commands and form fields have active zones, i.e. areas of the page where they capture user input.
  • the Netpage digital ink service 13 accepts digital ink 9 from a Netpage pen 8 . Since the pen typically only has a short-range communications capability, it forwards the digital ink 9 to the Netpage digital ink service 13 via a Netpage relay 14 which has a longer-range communications capability.
  • Typical relays include mobile phones, PDAs and personal computers.
  • the digital ink service 13 uses the impression identifier 7 in the digital ink 9 to retrieve the corresponding impression and input description 11 from the document service 1 , and attempts to assign each individual digital ink stroke to a form of the input description 11 . Once it detects that the user of the pen 8 has designated a form submission command, it interprets the digital ink 9 assigned to the form and submits the resultant form data 12 to the application associated with the command.
  • the document service 1 keeps a copy of every input description 11 it prints.
  • the digital ink service 13 In order to allow a user to fill in a form over an arbitrarily long time, the digital ink service 13 retains a copy of all digital ink 9 it receives, at least until the digital ink is interpreted and submitted to an application 4 .
  • the digital ink service 13 optionally retains all digital ink 9 indefinitely, to allow digital ink searching of both form content and document annotations.
  • the Netpage pen 8 may be incorporated directly into a hand-held device such as a mobile phone or PDA. Conversely, the pen may incorporate a long-range communications capability and not need a separate relay.
  • the digital ink service 13 may identify the interactive display 15 to a target application 4 to allow the application to communicate directly with the interactive display, thus allowing an interaction initiated via paper and pen to lead to a richer screen-based interaction, and generally allowing the development of hybrid paper- and screen-based applications which make the most of both media.
  • a pen 8 may use a name service to resolve the network address of a target digital ink service, based on pen identifier and possibly impression identifier.
  • a digital ink service 13 uses a name service to resolve the network address of a document service, based on impression identifier.
  • the digital ink service also supports streaming delivery of digital ink to an application. This allows an application to be more directly responsive to pen input.
  • streaming mode the digital ink service delivers both stroke digital ink and intervening “hover” digital ink to allow the application to provide real-time positional feedback to the user via a display.
  • the object model is a logical model relating to the external interfaces of the Netpage services. It is not intended as an implementation model.
  • FIG. 2 is a class diagram showing a document 2 comprising a visual description 16 and an input description 11 . For a given document, either description may be empty. Each document 2 is uniquely identified 18 .
  • the visual description 16 is a collection of visual elements 20 representing static 22 and dynamic elements 24 .
  • Static elements represent textflows 26 , images 28 , graphics 30 etc.
  • Dynamic elements 24 are described below.
  • the input description 11 is a collection of forms 32 , each of which consists of a collection of input elements 34 representing commands 36 and fields 38 .
  • Forms 32 may overlap both physically and logically, and the same input element 34 may participate in multiple forms.
  • Each input element 34 has a zone 40 which defines the area within which it captures input.
  • Each form 32 is associated with a target application 42 .
  • the application 42 receives submissions of the form 32 .
  • the application 42 is identified by an address 44 .
  • the impression 58 is associated with both the printer 6 on which it was printed and the user 62 who requested it, if known.
  • a pen 8 is owned by a single user 62 but a user may own any number of pens 8 . Accordingly, the user 62 is assigned a user ID and other user details 68 , and likewise, each pen 8 and printer 6 has a pen ID and details 70 , and printer ID and details 72 . A user 62 optionally has a default printer 6 .
  • the class diagram in FIG. 7 shows form data 12 submitted to an application consists of a collection of field values 90 .
  • the form data 12 is associated with a unique form instance 92 appearing in a printout 5 .
  • An application may specify a transaction identifier when the form instance 92 is first created (as part of a printout).
  • the transaction identifier 94 is submitted together with the form data 12 , allowing the target application to use it to index a unique transaction context.
  • the digital ink service 13 (see FIG. 1 ) supports a form lifecycle wherein a form may only be submitted once, may expire, may become frozen after being signed, and may be voided.
  • the form instance reflects the status of the form with respect to the form lifecycle.
  • a document 2 may also include dynamic elements 24 .
  • Each dynamic element has an associated dynamic object 96 , which in turn has associated object data 98 and a (typically type-specific) object application 99 .
  • a dynamic element 24 may be activated in place using a device such as a Netpage viewer (see U.S. Ser. No. 09/722,175 cross referenced above), or may be activated on an arbitrary interactive display, such as the interactive display 15 associated with the relay 14 (see FIG. 1 ), or may be activated via the Netpage Explorer (described below).
  • Examples of dynamic objects and their related applications include an audio clip and an audio player, a video clip and a video player, a photo and a photo viewer, a URL and a Web browser, an editable document and a word processor, to name just a few.
  • a dynamic object 96 may also be dynamically linked to an arbitrary location on an existing impression, e.g. by being “pasted” onto a virtual view of the impression or onto the impression itself.
  • FIG. 10 shows the relationships between the three stores nominally maintained by the Netpage document service 1 and the Netpage digital ink service 13 (see FIG. 1 ), with navigational qualifiers.
  • the Netpage services may have additional stores for registered users 62 , pens 8 and printers 6 , identifier allocation, and service address resolution (not shown).
  • FIG. 11 shows the fundamental flow of data in the Netpage System in more detail than FIG. 1 .
  • the document service 1 allows an application 4 to lodge a document 2 and to separately transmit a print request 106 to print the document 2 . It retains a copy of each lodged document in the document store 100 , and retains a copy of the document's input description, if any, in the document store 100 . When it prints a document 2 to a specified printer 6 , it records the printout 5 in the printout store 102 .
  • the digital ink service 13 accepts digital ink 9 from a pen 8 via a relay 14 , and retains a copy of received digital ink in the digital ink store 104 . It uses the impression identifier 60 in the digital ink 9 to retrieve the corresponding impression 58 and input description from the document service 1 . It then assigns each individual digital ink stroke to an element of the input description such as a command or a form field, according to the position and extent of the stroke and the active zone of the input element. Once it detects that the user of the pen 8 has designated a form submission command, the digital ink 9 assigned to each field is interpreted 108 according to field type, and the resultant form data 12 is submitted to the application 4 associated with the command.
  • an element of the input description such as a command or a form field
  • the digital ink service 13 interprets a mark in a checkbox as a check mark; it converts handwritten text in a text field into a string of text characters using intelligent character recognition; and it compares a handwritten signature in a signature field with the recorded signature of the user of the pen, and, if the signatures match, digitally signs the form data on behalf of the user.
  • FIG. 12 illustrates the flow of data in response to a reprint request 110 from an application 4 .
  • the document service 1 reprints a set of impressions 58 it optionally includes any drawings and handwriting captured via those impressions, and retrieves the corresponding digital ink from the digital ink store 104 in the digital ink service 13 (subject to visibility and access). It records a new printout to record the impression identifiers assigned to the reprinted impressions 112 .
  • FIG. 13 illustrates the flow of data in response to a general printing request from a non-Netpage-aware application 114 .
  • a Netpage-aware printer driver 116 converts platform-specific drawing commands 118 into a Netpage-compatible document 2 which it lodges with the document service 1 , and then sends a print request 106 for the document service 1 to print the document 2 via a specified printer 6 .
  • FIG. 14 illustrates the corresponding flow of data when the printer is not accessible by the document service 1 .
  • the printer driver 116 still lodges the document 2 with the document service 1 and records the printout 5 in the printout store 102 , but actually prints the documents 2 directly via the specified printer 6 .
  • FIG. 15 shows the flow of data in a walk-up environment. All print (and re-print) requests 120 from the Netpage application 4 are typically deferred. In response to a deferred print request 120 , the document service 1 records a printout 5 in the printout store 102 to capture impression-related information, and places the printout in a printout pending queue 122 for the requesting user.
  • each printer 6 has an associated token reader 124 , and the user presents a token 126 to the token reader to request actual printing of queued printouts via the printer 6 .
  • the token 126 may be a short-range RFID tag, a smartcard, a magnetic stripe card, etc.
  • the token reader 124 notifies a walk-up-handling application 128 of the user's proximity to the printer which in turn initiates printing via the document service 1 .
  • the document service can be used to provide walk-up printing for documents which are not encoded with Netpage tags and retained.
  • the token 126 may be any of a number of passive, semi-passive or active devices, including a surface or object bearing a Netpage tag pattern, linear barcode or two-dimensional barcode; a magnetic stripe card; a smart card or contact-less smart card; or a radio-frequency identification (RFID) tag.
  • the reader 124 may be any reader matched to the type of the token 126 , such as an optical reader utilising a scanning laser or a two-dimensional image sensor, as in conventional barcode readers or a Netpage sensing device; a magnetic stripe reader; a smart card reader; or an RFID reader.
  • the token reader 124 is associated with the printer 6 and the user presents the token 126 to the reader.
  • the reader 124 reads the token 126 and communicates the walk-up event to the Netpage server 1 .
  • the walk-up event identifies both the user 62 and the printer 6 .
  • the token 126 and hence the walk-up event may identify the user 62 explicitly, or the server may be required to perform a database lookup to translate the token identifier into a user identifier.
  • the reader and hence the walk-up event may identify the printer 6 explicitly, or the server 1 may be required to perform a database lookup to translate the reader identifier into a printer identifier.
  • FIG. 18 shows the reader 124 and the printer 6 as separate devices which are physically associated.
  • the reader 124 may be physically built into the printer 6 . It may also be electrically connected to the printer, with the printer delivering the walk-up event to the server. Alternatively and equivalently, the printer 6 may interpret the walk-up event itself, and explicitly retrieve the user's pending printouts for printing.
  • the user token 126 may be attached to or built into a portable device which the user 62 carries, such as a mobile phone, pen, electronic pen (such as a Netpage pen 8 ), wallet, security access card or token, or identification badge or card. It may also be stand-alone and purpose-specific.
  • the printer reader 124 may provide a receptacle for receiving the pen, whereby the pen makes electrical contact and establishes a wired communication link (e.g. USB) with the reader to communicate the user identifier to the reader.
  • a wired communication link e.g. USB
  • the token reader 124 is associated with the user 62 and the user presents the reader to the token 126 .
  • the reader 124 reads the token 126 and communicates the walk-up event to the Netpage server 1 .
  • the walk-up event identifies both the user 62 and the printer 6 .
  • the token 126 and hence the walk-up event may identify the printer 6 explicitly, or the server 1 may be required to perform a database lookup to translate the token identifier into a printer identifier.
  • the reader 124 and hence the walk-up event may identify the user 62 explicitly, or the server 1 may be required to perform a database lookup to translate the reader identifier into a user identifier.
  • the user 62 presents the reader 125 to the token 127 .
  • the reader 125 reads the token 127 . From the token it determines a short-range communication link to the printer 6 .
  • This may be a personal-area network (PAN) wireless link such as Bluetooth, wireless USB or ZigBee, or a local-area network (LAN) wireless link such as IEEE 802.11 (WiFi). It may also be a short-range optical link such as IrDA.
  • PAN personal-area network
  • LAN local-area network
  • WiFi IEEE 802.11
  • the token supplies the target address.
  • the tag pattern encodes the target address instead of an impression ID, x-y location, etc., and flags it as such.
  • the token 127 merely signals the user's token reader 126 to communicate a user identifier to the printer's token reader 126 .
  • the tag pattern flags the command to communicate the user identifier to the printer reader 124 . If a range of communication link types are supported, then the token 127 (e.g.
  • the user 62 may key a user identifier or job identifier into a keypad associated with the printer 6 , with an optional password.
  • the user 62 may also use a display-based input device associated with the printer to select their identity or their pending printout(s) from a list of users or jobs.
  • the Netpage system acts as a virtual filing cabinet for any printed document.
  • the Netpage system therefore provides users with a screen-based browser—the Netpage Explorer—for browsing and searching collections of printouts maintained by a document service, and for viewing individual printouts on-screen, including their digital ink.
  • the Netpage Explorer also supports real-time display of streaming digital ink, and so provides a basis for remote conferencing.
  • the Netpage System supports the embedding of dynamic objects in documents, and the dynamic linking of dynamic objects to locations on printed impressions.
  • the Netpage Explorer supports viewing of, and interaction with, such objects via the virtual view it provides of printed impressions, as well as the dynamic linking of such objects.
  • FIG. 17 shows a system using public Netpage services 134 running on a distributed set of servers on the public Internet 133 , and serving applications 4 and users on the public Internet 133 .
  • FIG. 21 shows a private Netpage system with services 136 (e.g. private Netpage document and digital ink services) running on one or more servers on a private intranet 138 , and serving applications 4 and users on the private intranet.
  • FIG. 22 shows a personal Netpage system with services 142 running on a single personal computer or other personal device 140 .
  • pre-printed Netpage content such as magazine adverts, catalogues, brochures, and product item Hyperlabels is typically hosted by public Netpage document services running on the Internet.
  • a private document service may also act as a caching proxy for a public document service.
  • a Netpage pen (or its relay) may therefore have knowledge of both a private and a public digital ink service, and may route digital ink pertaining to private impressions to the former and digital ink pertaining to public impressions to the latter. Even when a given pen's digital ink relates to a public impression and is nominally accessible on a public server, this need not imply that the owner of the impression or other users of the impression automatically gain access to that digital ink.
  • the Netpage system uses a surface coding to imbue otherwise passive surfaces with interactivity in conjunction with Netpage sensing devices such as the Netpage pen and the Netpage viewer.
  • Netpage sensing devices such as the Netpage pen and the Netpage viewer.
  • a Netpage sensing device When interacting with a Netpage coded surface, a Netpage sensing device generates a digital ink stream which indicates both the identity of the surface region relative to which the sensing device is moving, and the absolute path of the sensing device within the region.
  • This section defines optional authentication features of the Netpage surface coding, and associated authentication protocols.
  • the Netpage surface coding consists of a dense planar tiling of tags. Each tag encodes its own location in the plane. Each tag also encodes, in conjunction with adjacent tags, an identifier of the region containing the tag. This region ID is unique among all regions. In the Netpage system the region typically corresponds to the entire extent of the tagged surface, such as one side of a sheet of paper. In the Hyperlabel system the region typically corresponds to the surface of an entire product item, and the region ID corresponds to the unique item ID. For clarity in the following discussion, references to items and item IDs (or simply IDs), correspond to the region ID.
  • the surface coding is designed so that an acquisition field of view large enough to guarantee acquisition of an entire tag is large enough to guarantee acquisition of the ID of the region containing the tag. Acquisition of the tag itself guarantees acquisition of the tag's two-dimensional position within the region, as well as other tag-specific data.
  • the surface coding therefore allows a sensing device to acquire a region ID and a tag position during a purely local interaction with a coded surface, e.g. during a “click” or tap on a coded surface with a pen.
  • Cryptography is used to protect sensitive information, both in storage and in transit, and to authenticate parties to a transaction.
  • the Netpage and Hyperlabel systems use both classes of cryptography.
  • Secret-key cryptography also referred to as symmetric cryptography, uses the same key to encrypt and decrypt a message. Two parties wishing to exchange messages must first arrange to securely exchange the secret key.
  • Public-key cryptography also referred to as asymmetric cryptography, uses two encryption keys.
  • the two keys are mathematically related in such a way that any message encrypted using one key can only be decrypted using the other key.
  • One of these keys is then published, while the other is kept private. They are referred to as the public and private key respectively.
  • the public key is used to encrypt any message intended for the holder of the private key. Once encrypted using the public key, a message can only be decrypted using the private key.
  • two parties can securely exchange messages without first having to exchange a secret key. To ensure that the private key is secure, it is normal for the holder of the private key to generate the public-private key pair.
  • Public-key cryptography can be used to create a digital signature. If the holder of the private key creates a known hash of a message and then encrypts the hash using the private key, then anyone can verify that the encrypted hash constitutes the “signature” of the holder of the private key with respect to that particular message, simply by decrypting the encrypted hash using the public key and verifying the hash against the message. If the signature is appended to the message, then the recipient of the message can verify both that the message is genuine and that it has not been altered in transit.
  • Secret-key can also be used to create a digital signature, but has the disadvantage that signature verification can also be performed by a party privy to the secret key.
  • a certificate authority is a trusted third party which authenticates the association between a public key and a person's or other entity's identity.
  • the certificate authority verifies the identity by examining identity documents etc., and then creates and signs a digital certificate containing the identity details and public key.
  • Anonymously who trusts the certificate authority can use the public key in the certificate with a high degree of certainty that it is genuine. They just have to verify that the certificate has indeed been signed by the certificate authority, whose public key is well-known.
  • public-key cryptography utilises key lengths an order of magnitude larger, i.e. a few thousand bits compared with a few hundred bits.
  • Netpage surface coding security has two corresponding purposes:
  • a user If a user is able to determine the authenticity of the surface coding of an item, then the user may be able to make an informed decision about the likely authenticity of the item.
  • the only tractable way of forging an item with an authentic surface coding is to duplicate the surface coding of an existing item (and hence its ID). If the user is able to determine by other means that the ID of an item is likely to be unique, then the user may assume that the item is authentic.
  • the Netpage surface coding allows meaningful interaction between a sensing device and a coded surface during a purely local interaction, it is desirable for the surface coding to support authentication during a similarly local interaction, i.e. without requiring an increase in the size of the sensing device field of view.
  • authentication relies on verifying the correspondence between data and a signature of that data.
  • the item ID is unique and therefore provides a basis for a signature. If online authentication access is assumed, then the signature may simply be a random number associated with the item ID in an authentication database accessible to the trusted online authenticator.
  • the random number may be generated by any suitable method, such as via a deterministic (pseudo-random) algorithm, or via a stochastic physical process.
  • a keyed hash or encrypted hash may be preferable to a random number since it requires no additional space in the authentication database.
  • the signature To prevent forgery of a signature for an unsighted ID, the signature must be large enough to make exhaustive search via repeated accesses to the online authenticator intractable. If generated using a key rather than randomly, then the length of the signature must also be large enough to prevent the forger from deducing the key from known ID-signature pairs. Signatures of a few hundred bits are considered secure, whether generated using private or secret keys.
  • Fragment verification requires fragment identification. Fragments may be explicitly numbered, or may more economically be identified by the two-dimensional coordinate of their tag, modulo the repetition of the signature across a continuous tiling of tags.
  • the ID itself introduces a further vulnerability. Ideally it should be at least a few hundred bits. In the Netpage and Hyperlabel surface coding schemes it is 96 bits or less. To overcome this, the ID may be padded. For this to be effective the padding must be variable, i.e. it must vary from one ID to the next. Ideally the padding is simply a random number, and must then be stored in the authentication database indexed by ID. If the padding is deterministically generated from the ID then it is worthless.
  • Offline authentication of secret-key signatures requires the use of a trusted offline authentication device.
  • the QA chip (see U.S. Pat. No. 6,374,354, issued 16 Apr. 2002) provides the basis for such a device, although of limited capacity.
  • the QA chip can be programmed to verify a signature using a secret key securely held in its internal memory. In this scenario, however, it is impractical to support per-ID padding, and it is impractical even to support more than a very few secret keys.
  • a QA chip programmed in this manner is susceptible to a chosen-message attack. These constraints limit the applicability of a QA-chip-based trusted offline authentication device to niche applications.
  • offline authentication of public-key signatures i.e. generated using the corresponding private keys
  • An offline authentication device utilising public keys can trivially hold any number of public keys, and may be designed to retrieve additional public keys on demand, via a transient online connection, when it encounters an ID for which it knows it has no corresponding public signature key.
  • Untrusted offline authentication is likely to be attractive to most creators of secure items, since they are able to retain exclusive control of their private signature keys.
  • a disadvantage of offline authentication of a public-key signature is that the entire signature must be acquired from the coding, violating our desire to support authentication with a minimal field of view.
  • a corresponding advantage of offline authentication of a public-key signature is that access to the ID padding is no longer required, since decryption of the signature using the public signature key generates both the ID and its padding, and the padding can then be ignored.
  • Any random or linear swipe of a hand-held sensing device across a coded surface allows it to quickly acquire all of the fragments of the signature.
  • the sensing device can easily be programmed to signal the user when it has acquired a full set of fragments and has completed authentication.
  • a scanning laser can also easily acquire all of the fragments of the signature. Both kinds of devices may be programmed to only perform authentication when the tags indicate the presence of a signature.
  • a public-key signature may be authenticated online via any of its fragments in the same way as any signature, whether generated randomly or using a secret key.
  • the trusted online authenticator may generate the signature on demand using the private key and ID padding, or may store the signature explicitly in the authentication database. The latter approach obviates the need to store the ID padding.
  • signature-based authentication may be used in place of fragment-based authentication even when online access to a trusted authenticator is available.
  • This section defines a surface coding used by the Netpage system (described above in ‘Netpage Architecture’) to imbue otherwise passive surfaces with interactivity in conjunction with Netpage sensing devices such as the Netpage pen and the Netpage viewer.
  • a Netpage sensing device When interacting with a Netpage coded surface, a Netpage sensing device generates a digital ink stream which indicates both the identity of the surface region relative to which the sensing device is moving, and the absolute path of the sensing device within the region.
  • the Netpage surface coding consists of a dense planar tiling of tags. Each tag encodes its own location in the plane. Each tag also encodes, in conjunction with adjacent tags, an identifier of the region containing the tag. In the Netpage system, the region typically corresponds to the entire extent of the tagged surface, such as one side of a sheet of paper.
  • Each tag is represented by a pattern which contains two kinds of elements.
  • the first kind of element is a target.
  • Targets allow a tag to be located in an image of a coded surface, and allow the perspective distortion of the tag to be inferred.
  • the second kind of element is a macrodot. Each macrodot encodes the value of a bit by its presence or absence.
  • the pattern is represented on the coded surface in such a way as to allow it to be acquired by an optical imaging system, and in particular by an optical system with a narrowband response in the near-infrared.
  • the pattern is typically printed onto the surface using a narrowband near-infrared ink.
  • FIG. 23 shows the structure of a complete tag 200 .
  • Each of the four black circles 202 is a target.
  • the tag 200 and the overall pattern, has four-fold rotational symmetry at the physical level.
  • Each square region represents a symbol 204 , and each symbol represents four bits of information.
  • Each symbol 204 shown in the tag structure has a unique label 216 .
  • Each label 216 has an alphabetic prefix and a numeric suffix.
  • FIG. 24 shows the structure of a symbol 204 . It contains four macrodots 206 , each of which represents the value of one bit by its presence (one) or absence (zero).
  • the macrodot 206 spacing is specified by the parameter S throughout this specification. It has a nominal value of 143 ⁇ m, based on 9 dots printed at a pitch of 1600 dots per inch. However, it is allowed to vary within defined bounds according to the capabilities of the device used to produce the pattern.
  • FIG. 25 shows an array 208 of nine adjacent symbols 204 .
  • the macrodot 206 spacing is uniform both within and between symbols 208 .
  • FIG. 26 shows the ordering of the bits within a symbol 204 .
  • Bit zero 210 is the least significant within a symbol 204 ; bit three 212 is the most significant. Note that this ordering is relative to the orientation of the symbol 204 .
  • the orientation of a particular symbol 204 within the tag 200 is indicated by the orientation of the label 216 of the symbol in the tag diagrams (see for example FIG. 23 ). In general, the orientation of all symbols 204 within a particular segment of the tag 200 is the same, consistent with the bottom of the symbol being closest to the centre of the tag.
  • FIG. 27 shows the actual pattern of a tag 200 with every bit 206 set. Note that, in practice, every bit 206 of a tag 200 can never be set.
  • a macrodot 206 is nominally circular with a nominal diameter of (5/9)s. However, it is allowed to vary in size by ⁇ 10% according to the capabilities of the device used to produce the pattern.
  • a target 202 is nominally circular with a nominal diameter of (17/9)s. However, it is allowed to vary in size by ⁇ 10% according to the capabilities of the device used to produce the pattern.
  • the tag pattern is allowed to vary in scale by up to ⁇ 10% according to the capabilities of the device used to produce the pattern. Any deviation from the nominal scale is recorded in the tag data to allow accurate generation of position samples.
  • Tags 200 are arranged into tag groups 218 . Each tag group contains four tags arranged in a square. Each tag 200 has one of four possible tag types, each of which is labelled according to its location within the tag group 218 .
  • the tag type labels 220 are 00, 10, 01 and 11, as shown in FIG. 28 .
  • FIG. 29 shows how tag groups are repeated in a continuous tiling of tags, or tag pattern 222 .
  • the tiling guarantees the any set of four adjacent tags 200 contains one tag of each type 220 .
  • the tag contains four complete codewords.
  • the layout of the four codewords is shown in FIG. 30 .
  • Each codeword is of a punctured 2 4 -ary (8, 5) Reed-Solomon code.
  • the codewords are labelled A, B, C and D. Fragments of each codeword are distributed throughout the tag 200 .
  • Two of the codewords are unique to the tag 200 . These are referred to as local codewords 224 and are labelled A and B.
  • the tag 200 therefore encodes up to 40 bits of information unique to the tag.
  • the remaining two codewords are unique to a tag type, but common to all tags of the same type within a contiguous tiling of tags 222 . These are referred to as global codewords 226 and are labelled C and D, subscripted by tag type.
  • a tag group 218 therefore encodes up to 160 bits of information common to all tag groups within a contiguous tiling of tags.
  • Codewords are encoded using a punctured 2 4 -ary (8, 5) Reed-Solomon code.
  • a 2 4 -ary (8, 5) code encodes 20 data bits (i.e. five 4-bit symbols) and 12 redundancy bits (i.e. three 4-bit symbols) in each codeword. Its error-detecting capacity is three symbols. Its error-correcting capacity is one symbol.
  • FIG. 31 shows a codeword 228 of eight symbols 204 , with five symbols encoding data coordinates 230 and three symbols encoding redundancy coordinates 232 .
  • the codeword coordinates are indexed in coefficient order, and the data bit ordering follows the codeword bit ordering.
  • a punctured 2 4 -ary (8, 5) Reed-Solomon code is a 2 4 -ary (15, 5) Reed-Solomon code with seven redundancy coordinates removed. The removed coordinates are the most significant redundancy coordinates.
  • Reed-Solomon codes For a detailed description of Reed-Solomon codes, refer to Wicker, S. B. and V. K. Bhargava, eds., Reed - Solomon Codes and Their Applications , IEEE Press, 1994, the contents of which are incorporated herein by reference.
  • the tag coordinate space has two orthogonal axes labelled x and y respectively. When the positive x axis points to the right, then the positive y axis points down.
  • the surface coding does not specify the location of the tag coordinate space origin on a particular tagged surface, nor the orientation of the tag coordinate space with respect to the surface. This information is application-specific.
  • the application which prints the tags onto the paper may record the actual offset and orientation, and these can be used to normalise any digital ink subsequently captured in conjunction with the surface.
  • the position encoded in a tag is defined in units of tags. By convention, the position is taken to be the position of the centre of the target closest to the origin.
  • Table 1 defines the information fields embedded in the surface coding. Table 2 defines how these fields map to codewords.
  • TABLE 1 Field definitions field width description per codeword codeword type 2 The type of the codeword, i.e. one of A (b′00′), B (b′01′), C (b′10′) and D (b′11′). per tag tag type 2
  • the type 1 of the tag i.e. one of 00 (b′00′), 01 (b′01′), 10 (b′10′) and 11 (b′11′).
  • x coordinate 13 The unsigned x coordinate of the tag 2 .
  • y coordinate 13 The unsigned y coordinate of the tag b . active area flag 1 A flag indicating whether the tag is a member of an active area.
  • b′1′ indicates membership.
  • b′1′ indicates the presence of a map (see next field). If the map is absent then the value of each map entry is derived from the active area flag (see previous field).
  • b′1′ indicates membership.
  • per tag group encoding format 8 The format of the encoding. 0: the present encoding Other values are TBA. region flags 8 Flags controlling the interpretation and routing of region-related information.
  • region ID is an EPC 1: region is linked 2: region is interactive 3: region is signed 4: region includes data 5: region relates to mobile application Other bits are reserved and must be zero.
  • tag size 16 The difference between the actual tag size adjustment and the nominal tag size 4 , in 10 nm units, in sign-magnitude format.
  • region ID 96 The ID of the region containing the tags.
  • CRC 16 A CRC 5 of tag group data. total 320 1 corresponds to the bottom two bits of the x and y coordinates of the tag 2 allows a maximum coordinate value of approximately 14 m 3
  • FIG. 29 indicates the bit ordering of the map 4 the nominal tag size is 1.7145 mm (based on 1600 dpi, 9 dots per macrodot, and 12 macrodots per tag) 5 CCITT CRC-16 [7]
  • FIG. 32 shows a tag 200 and its eight immediate neighbours, each labelled with its corresponding bit index in the active area map.
  • An active area map indicates whether the corresponding tags are members of an active area.
  • An active area is an area within which any captured input should be immediately forwarded to the corresponding Netpage server for interoperation. It also allows the Netpage sensing device to signal to the user that the input will have an immediate effect.
  • the tag type can be moved into a global codeword to maximise local codeword utilization. This in turn can allow larger coordinates and/or 16-bit data fragments (potentially configurably in conjunction with coordinate precision). However, this reduces the independence of position decoding from region ID decoding and has not been included in the specification at this time.
  • the surface coding contains embedded data.
  • the data is encoded in multiple contiguous tags' data fragments, and is replicated in the surface coding as many times as it will fit.
  • the embedded data is encoded in such a way that a random and partial scan of the surface coding containing the embedded data can be sufficient to retrieve the entire data.
  • the scanning system reassembles the data from retrieved fragments, and reports to the user when sufficient fragments have been retrieved without error.
  • a 200-bit data block encodes 160 bits of data.
  • the block data is encoded in the data fragments of A contiguous group of 25 tags arranged in a 5 ⁇ 5 square.
  • a tag belongs to a block whose integer coordinate is the tag's coordinate divided by 5.
  • Within each block the data is arranged into tags with increasing x coordinate within increasing y coordinate.
  • a data fragment may be missing from a block where an active area map is present. However, the missing data fragment is likely to be recoverable from another copy of the block.
  • Data of arbitrary size is encoded into a superblock consisting of a contiguous set of blocks arranged in a rectangle.
  • the size of the superblock is encoded in each block.
  • a block belongs to a superblock whose integer coordinate is the block's coordinate divided by the superblock size.
  • the superblock is replicated in the surface coding as many times as it will fit, including partially along the edges of the surface coding.
  • the data encoded in the superblock may include more precise type information, more precise size information, and more extensive error detection and/or correction data.
  • TABLE 3 Embedded data block field width description data type 8 The type of the data in the superblock. Values include: 0: type is controlled by region flags 1: MIME Other values are TBA.
  • superblock width 8 The width of the superblock, in blocks.
  • superblock height 8 The height of the superblock, in blocks. data 160 The block data.
  • the surface coding contains a 160-bit cryptographic signature of the region ID.
  • the signature is encoded in a one-block superblock.
  • any signature fragment can be used, in conjunction with the region ID, to validate the signature.
  • the entire signature can be recovered by reading multiple tags, and can then be validated using the corresponding public signature key. This is discussed in more detail in Netpage Surface Coding Security section above.
  • the superblock contains Multipurpose Internet Mail Extensions (MIME) data according to RFC 2045 (see Freed, N., and N. Borenstein, “Multipurpose Internet Mail Extensions (MIME)-Part One: Format of Internet Message Bodies”, RFC 2045, November 1996), RFC 2046 (see Freed, N., and N. Borenstein, “Multipurpose Internet Mail Extensions (MIME)—Part Two: Media Types”, RFC 2046, November 1996) and related RFCs.
  • the MIME data consists of a header followed by a body.
  • the header is encoded as a variable-length text string preceded by an 8-bit string length.
  • the body is encoded as a variable-length type-specific octet stream preceded by a 16-bit size in big-endian format.
  • the basic top-level media types described in RFC 2046 include text, image, audio, video and application.
  • RFC 2425 (see Howes, T., M. Smith and F. Dawson, “A MIME Content-Type for Directory Information”, RFC 2045, September 1998) and RFC 2426 (see Dawson, F., and T. Howes, “vCard MIME Directory Profile”, RFC 2046, September 1998) describe a text subtype for directory information suitable, for example, for encoding contact information which might appear on a business card.
  • the Print Engine Controller supports the encoding of two fixed (per-page) 2 4 -ary (15, 5) Reed-Solomon codewords and six variable (per-tag) 2 4 -ary (15, 5) Reed-Solomon codewords. Furthermore, PEC supports the rendering of tags via a rectangular unit cell whose layout is constant (per page) but whose variable codeword data may vary from one unit cell to the next. PEC does not allow unit cells to overlap in the direction of page movement.
  • a unit cell compatible with PEC contains a single tag group consisting of four tags. The tag group contains a single A codeword unique to the tag group but replicated four times within the tag group, and four unique B codewords.
  • the tag group also contains eight fixed C and D codewords. One of these can be encoded using the remaining one of PEC's variable codewords, two more can be encoded using PEC's two fixed codewords, and the remaining five can be encoded and pre-rendered into the Tag Format Structure (TFS) supplied to PEC.
  • TFS Tag Format Structure
  • PEC imposes a limit of 32 unique bit addresses per TFS row. The contents of the unit cell respect this limit. PEC also imposes a limit of 384 on the width of the TFS. The contents of the unit cell respect this limit.
  • the minimum imaging field of view required to guarantee acquisition of an entire tag has a diameter of 39.6s (i.e. (2 ⁇ (12+2)) ⁇ square root over (2) ⁇ s), allowing for arbitrary alignment between the surface coding and the field of view. Given a macrodot spacing of 143 ⁇ m, this gives a required field of view of 5.7 mm.
  • region ID decoding need not occur at the same rate as position decoding.
  • decoding of a codeword can be avoided if the codeword is found to be identical to an already-known good codeword.

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US11/193,479 2004-08-03 2005-08-01 Printer with user ID sensor Abandoned US20060028674A1 (en)

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AU2004904740A AU2004904740A0 (en) 2004-08-20 Methods, systems and apparatus (NPS080)
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AU2004905413A AU2004905413A0 (en) 2004-09-21 Methods, systems and apparatus (NPS083)
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US11/193,481 Abandoned US20060028400A1 (en) 2004-08-03 2005-08-01 Head mounted display with wave front modulator
US11/193,435 Expired - Fee Related US7567241B2 (en) 2004-08-03 2005-08-01 Stylus with customizable appearance
US12/497,684 Expired - Fee Related US8308387B2 (en) 2004-08-03 2009-07-05 Force-sensing electronic pen with user-replaceable cartridge
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US11/193,435 Expired - Fee Related US7567241B2 (en) 2004-08-03 2005-08-01 Stylus with customizable appearance
US12/497,684 Expired - Fee Related US8308387B2 (en) 2004-08-03 2009-07-05 Force-sensing electronic pen with user-replaceable cartridge
US12/897,758 Abandoned US20110018903A1 (en) 2004-08-03 2010-10-04 Augmented reality device for presenting virtual imagery registered to a viewed surface

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