WO1999050751A1 - Routing document identifiers - Google Patents

Routing document identifiers Download PDF

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Publication number
WO1999050751A1
WO1999050751A1 PCT/US1998/020596 US9820596W WO9950751A1 WO 1999050751 A1 WO1999050751 A1 WO 1999050751A1 US 9820596 W US9820596 W US 9820596W WO 9950751 A1 WO9950751 A1 WO 9950751A1
Authority
WO
WIPO (PCT)
Prior art keywords
page
pointer
address
data
router
Prior art date
Application number
PCT/US1998/020596
Other languages
French (fr)
Inventor
Marc Dymetman
Max Copperman
Original Assignee
Xerox Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GBGB9806977.6A priority Critical patent/GB9806977D0/en
Priority to GBGB9807001.4A priority patent/GB9807001D0/en
Priority to GB9806973.5 priority
Priority to GB9807001.4 priority
Priority to GB9806977.6 priority
Priority to GBGB9806973.5A priority patent/GB9806973D0/en
Application filed by Xerox Corporation filed Critical Xerox Corporation
Priority claimed from US09/276,084 external-priority patent/US6345304B1/en
Publication of WO1999050751A1 publication Critical patent/WO1999050751A1/en

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354Pointing 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
    • G06F3/03545Pens or stylus
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304Detection arrangements using opto-electronic means
    • G06F3/0317Detection 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304Detection arrangements using opto-electronic means
    • G06F3/0317Detection 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
    • G06F3/0321Detection 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19594Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays using a television camera or a still video camera
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N1/32101Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N1/32128Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title attached to the image data, e.g. file header, transmitted message header, information on the same page or in the same computer file as the image
    • H04N1/32133Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title attached to the image data, e.g. file header, transmitted message header, information on the same page or in the same computer file as the image on the same paper sheet, e.g. a facsimile page header
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3212Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to a job, e.g. communication, capture or filing of an image
    • H04N2201/3214Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to a job, e.g. communication, capture or filing of an image of a date
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3212Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to a job, e.g. communication, capture or filing of an image
    • H04N2201/3215Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to a job, e.g. communication, capture or filing of an image of a time or duration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3225Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document
    • H04N2201/3226Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document of identification information or the like, e.g. ID code, index, title, part of an image, reduced-size image
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3225Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of data relating to an image, a page or a document
    • H04N2201/3253Position information, e.g. geographical position at time of capture, GPS data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3269Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title of machine readable codes or marks, e.g. bar codes or glyphs
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device
    • H04N2201/3201Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
    • H04N2201/3271Printing or stamping

Abstract

Routing is performed by receiving an item of data that indicates a page identifier (702) and by using the page identifier indicated by the item of data to obtain a network address (708).

Description

Routing document identifiers

The present invention relates to functionalities of computers and computer networks, and more particularly to the routing of document identifiers across such networks. The invention addresses problems arising in the implementation of techniques described in GB patent application 98 (applicants' ref.

R/98003/JDR) based on substrates, e.g. paper, or documents produced therefrom, which include visible or invisible coded markings identifying the substrate and preferably locations or zones within it. This marking scheme in turn preferably uses Xerox DataGlyphs. Such substrates are referred to hereinafter as "coded substrates".

Each physical coded substrate contains a pid-code (pid stands for page- identifier) which identifies it uniquely world-wide and permits to locate the "digital- page" coupled with this physical page, which can sit anywhere on the global network. This pid is encoded in DataGlyphs (visibly or invisibly) on the surface of the page in such a way that a "pointer" equipped with a small camera can recover the pid by looking at a small circular area of radius r, anywhere on the page. With the coded substrates, the space needed for encoding on a physical page the net address of the digital-page counterpart is at a high premium.

Because the pid must be recovered from a small area, it is important to ensure that two conditions are met:

1. The pid is encoded using a small number of bits.

2. The pid can address unambiguously any of a large number of digital- pages.

In order to respect these two conditions, the theoretically optimal scheme is to use a small number of bits for the pid, say 64, and to use the pid to address 2Λ64 different digital-pages. (To give an idea of how big this figure is: if every inhabitant of the Earth was to produce 80 thousands sheets of Intelligent Paper a day for the next century, a 64 bits pid would be sufficient to uniquely identify all the digital-pages needed.) Obviously, with such a scheme, there must be a way to map the pid recovered by the pointer into the net address of the corresponding digital page. The solution that is envisaged in the abovementioned patent application (ref. R/98003/JDR) is to use a central router. This router contains a table of pairs (pid, address). The pointer sends a pid to the router and gets back the address to which it can then connect to retrieve the relevant digital-page.

This centralised routing scheme has two problems, though. First, it may require huge tables for storing the (pid, address) pairs. Secondly, the number of requests per day to the router can be very large.

There is a need for techniques for implementing a workable routing system, without incurring unrealistic address-storage and traffic-frequency costs at the central router's site. The present invention provides a method carried out in a data processing device comprising receiving a data set, the data set including a page identification code, sending the page identification code to a router, and receiving back from the router a network address, the network address being the address of a server associated with said page identification code. The invention further provides a method carried out in a data processing system, comprising: receiving a data set from a remote device via network, the data set defining a page identification code, using association data, the association data defining a mapping between a plurality of page identification codes and a plurality of network addresses, determining a network address associated with the received page identification code, and transmitting the network address to the remote device.

The invention further provides a programmable data processing device when suitably programmed for carrying out the methods as described above.

The invention has the advantage of requiring smaller and more efficient routing facilities, and which capitalises on the tendency of publishers (responsible for printing on coded substrates) to buy coded substrates in bulk. The scheme has also the advantage that no address space is lost (64 bits of data on the paper still allow to address 2Λ64 digital pages).

For the purpose of illustration it is assumed that the company producing (printing) the coded substrates, providing the central address routing and selling the pointers is one and the same company, which we will call company X. It is also assumed that this company sells the sheets, not directly to end users, but to publishers (for instance book or journal publishers) who sell the printed pages (i.e. after printing with human-readable information, such as the text of an article) to the end-users. (One centralised router is assumed for simplicity. A variant where several mirror sites for the router is obviously compatible with the invention. More specifically: In the non- variant, there is one central router whose address is a priori stored in each pointer. Requests are sent to this router by the pointer. In the variant, there are several (let's say 10 for example) mirror routers that each contain the same information as the single router in the non-variant. They are just copies of this router, but are located at different geographical locations. The addresses of these 10 routers are a priori known to the pointers. When the pointer needs to make a request to the router, it is indifferent which router copy it chooses to send this request. The pointer chooses this router randomly among the 10 it knows. If all pointers do the same, this has the net effect of dividing by 10 the number of requests that each router has to answer on average each day. This has also the effect of making a more efficient use of the network communication channels. )

Further advantages of the invention are that it allows a small number of bits encoded on the page to address a large number of digital pages, that it minimises hits on central router, and no redundancy in the address codes is needed (compare hierarchical internet addresses).

It will be appreciated that the techniques described herein may also be used in conjunction with the techniques described in GB patent applications 98 (applicants' ref.R/98003/JDR) and 98 (applicants' ref.R/98004/JDR), filed concurrently herewith.

Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Figure 1 illustrates the components of a pointed document as printed on a coded substrate;

Figure 2 shows a sample of zones, and the disposition of machine readable data, on a coded substrate;

Figures 3 and 4 show how digital data is encoded in the zones illustrated in Fig. 2; Figure 5 schematically illustrates an embodiment of a pointer which may be used in implementing the invention; 4

Figure 6 shows a configuration for passing page identification codes and/or page location codes from the pointer of Fig. 5 to a network computer, in accordance with an embodiment of the invention;

Figure 7 illustrates the assignment of page-id groups and the association of page-ids and server addresses in an embodiment employing centralised routing;

Figure 8 shows the retrieval of the internal address for a first page using a first page-id;

Figure 9 shows the retrieval of the internal address for a second page using a second page-id; and Figure 10 is a flow chart of the processing steps in implementing the retrieval scheme of Fig. 8.

Figure 1 illustrates the components of a pointed document as printed on a coded substrate. The printed document 102 comprises a layer 104 of printed visible (human-readable) information printed on a coded substrate 106. The coded substrate 106 in turn comprises a layer 108 of visible or invisible machine readable markings printed on a sheet medium 110 (e.g. paper).

Figure 2 shows a sample of zones, and the disposition of machine readable data, on a coded substrate. Each zone or cell 202 includes a border 204 and an orientation marker 206. A first set of markings 208 over part of the interior of the cell 202 are encoded representations of the page-id, while a second set of markings 210 over a (smaller) part of the interior of the cell 202 are encoded representations of the localisation (page- loc) - uniquely defining the position of the cell 202 within the page.

Figures 3 and 4 show how digital data is encoded in the zones illustrated in Fig. 2. Fig. 3 shows the binary data, i.e. 47 bits of page-id in the upper section 302 (the bit stream wraps at the cell border 204), and 16 its of page localisation data (loc) in the lower section 304). The page-id code denotes 108429159095492 = 629DA182DCC4 (hexadecimal) =

110001010011101101000011000001011011100110001000001000000010101 (binary; to make the wrapping explicit). In the 16 bit loc code in section 304, there are 8 bits for the X co-ordinate and 8 bits for the Y co-ordinate. Thus, for the cell (zone) shown, its position is 16,21 on the substrate.

Fig. 4 shows the same data as in Fig. 3, but represented by Data Glyph markings. Encoding using data glyphs and the retrieval of data therefrom is discussed further in US-A-5,486,686, EP-A-469864, and the abovementioned GB application (ref.R/98003/JDR). Here, there is a first set of glyphs (markings) in upper section 402 and a second set in lower section 404, the two sets of glyphs being encoded representations of page-id and loc codes. Figure 5 schematically illustrates an embodiment of a pointer which may be used in implementing the invention. The pointer 502 comprises a marking device 504 (which may be a pen or any other marking device suitable for making marks which are visible to a user), and an image capture device 506. In use, whether or not the user is making marks using the marking device 504, the image capture device 506 is able to capture images of an area A of a document 508. (For the sake of illustration, the sizes of these elements are exaggerated - e.g. in practice, the area A may be much closer to the tip 505 of the marking device 504 than appears). In certain embodiments, the marking device 504 may be omitted.

The document 508 may be a 'blank' coded substrate, or such a substrate having human-readable information printed thereon.

Figure 6 shows a configuration for passing page identification codes and/or page location codes from the pointer of Fig. 5 to a network computer, in accordance with an embodiment of the invention. The image capture device (e.g. CCD camera) 506 is coupled by wired or wireless (e.g. IR or RF) link to processing device 602 and in use provides image data defining capture images to the processing device 602. The operative elements of the processing device 602 are a frame grabber circuit 604, image decoding software 606, and a CPU 608, which are known in the art. (In certain embodiments, the camera 506 and processing device 602 may be combined into an integral handheld unit). In use, the processing device 602 extracts from the image data the corresponding page-id and page-location data (<pid, loc>) and communicates them in a wired or wireless fashion to a local device (here, a network computer 610, which is linked to the network (intranet, internet) in a known manner). The computer 610 has its own unique network address, but need not have any information output device (e.g. display screen, printer). Figure 7 illustrates the assignment of page-id groups and the association of page-ids and server addresses in an embodiment employing centralised routing. This shows the distribution 702 of page-ids, and the groups thereof (e.g. O-a, a-b), each of which is encoded in one coded substrate of a batch as it is supplied to a publisher for printing. A table 704 is stored at the central router computer: this stores the associated between groups 706 of consecutive page-ids and server addresses 708. Here addrk l is the internet address of the server for page-ids k through 1.

Figure 8 shows the retrieval of the internal address for a first page using a first page-id.

The pointer 502, while pointed at a coded substrate, can communicate a page-id i to a central router 802 and to a server 804. The protocol may be described as follows (this is illustrated in Fig. 10).

1. Pointer reads page whose page-id is i where m < i < n. 2. Pointer transmits i to central router.

3. Central router transmits (m, n, addrm n) to pointer.

4. Triple (m, n, addrm n) is stored in pointer.

5. Pointer transmits i to server at addrm n.

6. Server transmits internet address of digital page for i to pointer. 7. Pointer interacts with digital page.

Figure 9 shows the retrieval of the internal address for a second page using a second page-id. Here the pointer 502 communicates page-id j to the server 804. The protocol is as follows.

1. Pointer reads page whose page-id is j where m < j < n. 2. Pointer transmits j to server at addrm n.

3. Server transmits internet address of digital page for j to pointer.

4. Pointer interacts with digital page.

It can be seen that techniques according to the invention may be used to implement the following scheme. 1. Publisher P buys p coded substrates from X. P provides the net address A of a server belonging to P.

2. X has previously altogether sold m coded substrates to other publishers (or to X). These sheets have been given page-ids (pid's) ranging from 0 to m-1. X produces p new coded substrates, numbered from m to n = m + p - 1. 3. X installs number m as a key in its central router database (it is assumed that number m was previously installed in a similar way), and associates with this key the address addrm,n = A provided by P for these p pages (see Fig. 8). 4. At a later time, a user clicks his/her pointer at one of these p sheets for the first time. This results in the pid of this sheet to be sent to the central router. The central router returns to the pointer a record (m,n,addrm,n), where m, n, and addrm,n are as above. This triple is stored in the pointer's memory (see Fig. 8). (It is essential that pointers be co-operative in storing these triples. This behaviour can be enforced through a priori specification or through some "punishing" scheme for uncooperative pointers. Also, because the pointer has limited memory, it may have to expel a previously stored record. This qualification does not seriously affect the proposal.)

5. The pointer sends the pid i (a number comprised between m and n) to the address addrm,n. The final routing of the pid is now the responsibility of the publisher's server at addrm,n, who retrieves the digital page associated with pid (see Fig. 8).

6. If, at a later stage, the same pointer clicks on *any* page having a pid j in the range [m,n[, then the pointer consults its memory first, and notices that it contains the record (m,n,addrm,n). Rather than now consulting the central router, it consults directly the publisher's server at address addrm,n (see Fig. 9). There are two main advantages:

1. In the central router, only one entry needs to be stored for each (batch) bulk purchase of coded substrates. 2. If a journal publisher, let's say, buys in a single purchase enough sheets for a year of publication, a subscriber to the journal will only access the central router once in a year; for the first request to the router will result in caching the whole range of pages for a year of the journal. Because of this tendency for users to click repeatedly on pages belonging to the same sheet batch, the number of per day requests to the central router diminishes dramatically.

The routing fee charged by X to the publishers can promote the scheme by being regressive relative to the number of sheets bought in a single purchase by a publisher. The rationale behind this regressive cost is the fact that the routing costs associated to two separate purchases by the same publisher of p and then p' sheets, associated with two publisher servers A and A', are higher than the routing costs associated with a single purchase of p+p1 sheets associated with a single publisher server A. This difference is especially large if the fact that a pointer has "seen" the first batch significantly increases its probability of seeing the second one sometime in the future (as compared to the a priori probability of seeing the second batch). It will be appreciated that these principles could be repeated recursively: the publisher's server itself could be organised in a way similar to the central router.

Claims

CLAIMS:
1. A method for performing routing comprising:
receiving an item of data that indicates a page identifier; and
using the page identifier indicated by the item of data to obtain a network address.
PCT/US1998/020596 1998-04-01 1998-09-30 Routing document identifiers WO1999050751A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GBGB9807001.4A GB9807001D0 (en) 1998-04-01 1998-04-01 Cross-network functions via linked hardcopy and electronic documents
GB9806973.5 1998-04-01
GB9807001.4 1998-04-01
GB9806977.6 1998-04-01
GBGB9806973.5A GB9806973D0 (en) 1998-04-01 1998-04-01 Routing document identifiers
GBGB9806977.6A GB9806977D0 (en) 1998-04-01 1998-04-01 Paper indexing of recordings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/276,084 US6345304B1 (en) 1998-04-01 1999-03-25 Obtaining network addresses from identifiers

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/276,084 Continuation-In-Part US6345304B1 (en) 1998-04-01 1999-03-25 Obtaining network addresses from identifiers

Publications (1)

Publication Number Publication Date
WO1999050751A1 true WO1999050751A1 (en) 1999-10-07

Family

ID=27269269

Family Applications (3)

Application Number Title Priority Date Filing Date
PCT/US1998/020596 WO1999050751A1 (en) 1998-04-01 1998-09-30 Routing document identifiers
PCT/US1998/020597 WO1999050787A1 (en) 1998-04-01 1998-09-30 Cross-network functions via linked hardcopy and electronic documents
PCT/US1998/020593 WO1999050736A1 (en) 1998-04-01 1998-09-30 Paper indexing of recordings

Family Applications After (2)

Application Number Title Priority Date Filing Date
PCT/US1998/020597 WO1999050787A1 (en) 1998-04-01 1998-09-30 Cross-network functions via linked hardcopy and electronic documents
PCT/US1998/020593 WO1999050736A1 (en) 1998-04-01 1998-09-30 Paper indexing of recordings

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US6958747B2 (en) 2000-08-30 2005-10-25 Anoto Ab Method for making a product
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KR100746091B1 (en) 1999-10-25 2007-08-03 실버브룩 리서치 피티와이 리미티드 Method and system for route planning
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US7710408B2 (en) 1999-08-30 2010-05-04 Anoto Ab Centralized information management based upon position information
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US6624848B1 (en) 1997-07-15 2003-09-23 Silverbrook Research Pty Ltd Cascading image modification using multiple digital cameras incorporating image processing
US6690419B1 (en) 1997-07-15 2004-02-10 Silverbrook Research Pty Ltd Utilising eye detection methods for image processing in a digital image camera
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