Abstract:
The present disclosure describes, e.g., electronic tickets, coupons and credits. In some cases these electronic objects are represented by imagery or audio. One claim recites a handheld apparatus including: an input for receiving an electronic coupon or credit, the electronic coupon or credit comprising audio; electronic memory for storing a received electronic coupon or credit; an audio output for outputting the received electronic coupon or credit, in which the electronic coupon or credit is intended to be applied to a purchase or transaction; and an electronic processor programmed for controlling output of the received electronic coupon or credit. Of course, other claims and combinations are provided too.

Description:
FIELD OF THE INVENTION 
     The present disclosure relates to digital watermarking, content identification and electronic tickets, coupons and credits, and is particularly illustrated with reference to handheld computing devices and data management systems. 
     BACKGROUND AND SUMMARY OF THE INVENTION 
     Computers continue to evolve. Time has witnessed huge, lumbering computers give way to nimble and powerful desktop, laptop, and handheld computing devices. Computational power has increased on almost an exponential curve, while size and portability of computing devices have significantly reduced. 
     People, once shackled to their computers, now experience new-found freedom as cell phones, video games, calculators, positioning systems, and personal computing devices become increasingly capable. 
     Traditional notions of computing are being challenged. Telecommuting is now common. A person can retreat to the mountains, walk along a trout-filled stream, and still remain connected to the business world. A parent can cheer on the sidelines of a soccer game and still pack along a virtual workspace on a handheld device. Advances in wireless communication and satellite systems provide increasing flexibility. 
     Life-changing advances are anticipated as computers continue to evolve. 
     The present disclosure employs digital watermarking techniques to even further increase the applications and flexibility of computers and computer-assisted activities. In some embodiments, digital watermarking techniques are combined with handheld computing devices. In other embodiments, digital watermarking techniques are employed with a document and/or data management systems. In still other embodiments, digital watermarking system and methods provide convenience and computing enhancements. 
     Digital watermarking, a form of steganography, is the science of encoding physical and electronic objects with plural-bit digital data, in such a manner that the data is essentially hidden from human perception, yet can be recovered by computer analysis. In physical objects, the data may be encoded in the form of surface texturing, or printing. Such marking can be detected from optical scan data, e.g., from a scanner, optical reader, input device, digital camera, or web cam. In electronic objects (e.g., digital audio or imagery—including video), the data may be encoded as slight variations in sample values. Or, if the object is represented in a so-called orthogonal domain (also termed “non-perceptual,” e.g., MPEG, DCT, wavelet, etc.), the data may be encoded as slight variations in quantization values or levels. The assignee&#39;s U.S. Pat. No. 6,122,403 and U.S. application Ser. No. 09/503,881 (U.S. Pat. No. 6,614,914) are illustrative of certain watermarking technologies. Artisans know many others. 
     Digital watermarking systems typically have two primary components: an encoder that embeds the watermark in a host media signal, and a decoder that detects and reads the embedded watermark from a signal suspected of containing a watermark (e.g., a suspect signal). The encoder embeds a watermark by altering the host media signal. The decoder component analyzes a suspect signal to detect whether a watermark is present. In applications where the watermark encodes information, the decoder extracts this information from the detected watermark. 
     The analysis of the detected data can be accomplished in various ways. Presently, most steganographic decoding relies on general purpose microprocessors that are programmed by suitable software instructions to perform the necessary analysis. Other arrangements, such as using dedicated hardware, reprogrammable gate arrays, or other techniques, can of course be used. 
     Determining orientation of embedded data can be discerned by reference to visual clues. For example, some objects include subliminal graticule data, or other calibration data, steganographically encoded with the embedded data to aid in determining orientation. Others objects can employ overt markings, either placed for that sole purpose (e.g. reference lines or fiducials), or serving another purpose as well (e.g. lines of text), to discern orientation. Edge-detection algorithms can also be employed to deduce the orientation of the object by reference to its edges. 
     In one example, subliminal graticule data can be sensed to identify the locations within the image data where the binary data is encoded. The nominal luminance of each patch before encoding (e.g., background shading on a document) is slightly increased or decreased to encode a binary “1” or “0.” The change is slight enough to be generally imperceptible to human observers, yet statistically detectable from the image data. Preferably, the degree of change is adapted to the character of the underlying image, with relatively greater changes being made in regions where the human eye is less likely to notice them. Each area thus encoded can convey plural bits of data (e.g., 16-256 bits). 
     One problem that arises in many watermarking applications is that of object or positioning corruption. If the object is reproduced, skewed, or distorted, in some manner such that the content presented for watermark decoding is not identical to the object as originally watermarked, then the decoding process may be unable to recognize and decode the watermark. To deal with such problems, the watermark can convey a reference signal. The reference signal is of such a character as to permit its detection even in the presence of relatively severe distortion. Once found, the attributes of the distorted reference signal can be used to quantify the content&#39;s distortion. Watermark decoding can then proceed—informed by information about the particular distortion present. 
     The assignee&#39;s U.S. application Ser. Nos. 09/503,881 (U.S. Pat. No. 6,614,914) and Ser. No. 09/452,023 (U.S. Pat. No. 6,408,082) detail certain reference signals, and processing methods, that permit such watermark decoding even in the presence of distortion. In some image watermarking embodiments, the reference signal comprises a constellation of quasi-impulse functions in the Fourier magnitude domain, each with pseudorandom phase. To detect and quantify the distortion, the watermark decoder converts the watermarked image to the Fourier magnitude domain and then performs a log polar resampling of the Fourier magnitude image. A generalized matched filter correlates the known orientation signal with the re-sampled watermarked signal to find the rotation and scale parameters providing the highest correlation. The watermark decoder performs additional correlation operations between the phase information of the known orientation signal and the watermarked signal to determine translation parameters, which identify the origin of the watermark message signal. Having determined the rotation, scale and translation of the watermark signal, the reader then adjusts the image data to compensate for this distortion, and extracts the watermark message signal as described above. 
     Such watermarking techniques, and many others known to those skilled in the art, may be suitably employed with the present invention. 
     One combination includes a method of verifying a ticket stored on a handheld computing device. The handheld computing device has a display to display the ticket, the ticket includes a digital watermark having an identifier. The method includes: upon presentment of a displayed electronic ticket displayed via the handheld computing device&#39;s display, decoding the digital watermark from the displayed ticket to retrieve the identifier, the act of decoding utilizes a multi-purpose electronic processor configured for the decoding; and verifying the ticket based on the identifier. 
     Another combination includes a method to gain entry to an event or movie including: purchasing a ticket online; receiving an electronic ticket, the electronic ticket being stored in a handheld computing device, the handheld computing device comprising a display, wherein the electronic ticket includes a digital watermark embedded therein; displaying the electronic ticket on the display; and presenting the display to a watermark reading device, which captures optical scan data representing the display and decodes the watermark from the optical scan data. 
     Yet another combination includes a method including: receiving an electronic ticket or electronic coupon, the electronic ticket or coupon comprising audio, the electronic ticket or electronic coupon being stored in a handheld computing device, the handheld computing device comprising an audio output; outputting the audio through the output of the handheld computing device in proximity of a recognition device, wherein the recognition device analyzes the outputted audio to derive information there from, the information is useable to verify the electronic ticket or electronic coupon, and wherein entry to an event or movie is permissible when the electronic ticket is verified or a coupon is applied to a purchase when the electronic coupon is verified. 
     Still another combination includes a method to regulate entry to an event or secure area. The method includes: obtaining optical scan data corresponding to at least a portion of a display of a handheld computing device, wherein the display includes an image or video displayed thereon during at least capture of the optical scan data, and wherein the image or video includes machine-readable indicia, the machine-readable indicia including a plural-bit message; analyzing the optical scan data to obtain the plural-bit message, the act of analyzing utilizes a programmed multi-purpose electronic processor; and based at least in part on the plural-bit message, regulating entry to an event or secure area. 
     Another combination includes a method comprising: upon presentment of a handheld computing device including an output, capturing audio emanating from the output, wherein the audio includes at least one steganographic watermark embedded therein, the steganographic watermark including a plural-bit message; analyzing the captured audio to obtain the plural-bit message, the act of analyzing utilizes a multi-purpose electronic processor configured for the analyzing; and based at least in part on the plural-bit message, regulating entry to an event or secure area. 
     Yet another combination includes a method having: upon presentment of a handheld computing device including a display, capturing image data representing at least a portion of the display, wherein the display comprises an image displayed thereon, the image comprising a digital watermark embedded therein; decoding the digital watermark from the captured image data to recover plural-bit data, the act of decoding utilizes a multi-purpose electronic processor programmed to achieve the decoding; triggering an action based at least in part on the plural-bit data. 
     Another combination includes: upon presentment of a handheld computing device including a display, capturing image data representing at least a portion of the display, wherein the display displays machine readable indicia; decoding the machine-readable indicia to recover plural-bit data conveyed thereby, the plural-bit data being associated with a credit or coupon, the act of decoding utilizes a configured multi-purpose electronic processor; verifying the authenticity or permissible use of the credit or coupon; and triggering an action based at least in part on the plural-bit data, including applying the credit or coupon to a purchase, but only when the credit or coupon is determined to be authentic or permitted by the act of verifying. 
     Still another combination includes: upon presentment of a handheld computing device including a display, receiving image data or video data corresponding to an image or video that is displayed via the display; analyzing received image data or video data to derive information there from, the act of analyzing utilizes a multi-purpose electronic processor that is configured to carry out the act of analyzing; triggering an action based at least in part on the information, in which the action comprises at least one of: i) applying a credit or coupon to a purchase, or ii) regulating entry to an event, movie or secure area. 
     Another combination includes a method having: receiving data representing audio rendered by a handheld computing device, the handheld computing device comprising an audio output through which the audio is rendered; analyzing the data to derive information there from, the act of analyzing utilizes a multi-purpose electronic processor that is configured to carry out the analyzing; and triggering an action based at least in part on the information, in which the action comprises at least one action of: i) applying a credit or coupon to a purchase, or ii) regulating entry to an event, movie or secure area. 
     Yet another combination includes a handheld apparatus having: an input for receiving an electronic coupon or credit, the electronic coupon or credit comprising audio; electronic memory for storing a received electronic coupon or credit; and an audio output for outputting the received electronic coupon or credit, in which the electronic coupon or credit is intended to be applied to a purchase or transaction 
     Still another combination is a handheld apparatus including: an input for receiving an electronic coupon or credit, the electronic coupon or credit comprising audio; electronic memory for storing a received electronic coupon or credit; an audio output for outputting the received electronic coupon or credit, in which the electronic coupon or credit is intended to be applied to a purchase or transaction; and an electronic processor programmed for controlling output of the received electronic coupon or credit. 
     Another combination is a cell phone including: electronic memory for storing data representing audio; an audio output for rendering stored audio, in which stored audio, once rendered and analyzed, facilitates an action comprising: i) applying a credit or coupon to a purchase, or ii) regulating entry to an event, movie or secure area; and an electronic processor programmed for controlling output of stored audio. 
     And, yet another combination is a cell phone including: electronic memory for storing image data or video data; a display for displaying stored image or video data for image capture, in which captured imagery once analyzed facilitates an action comprising: i) applying a credit or coupon to a purchase, or ii) regulating entry to an event, movie or secure area; and an electronic processor programmed to control display of stored image or video. 
     The foregoing and other features and advantages of the present invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram of a handheld computing device. 
         FIGS. 2A ,  2 B and  2 C are functional diagrams illustrating various communication paths for the handheld computing device of  FIG. 1 . 
         FIG. 3  is a flow diagram of a process for inventory management. 
         FIG. 4  is a flow diagram of a process involving watermarking monetary objects. 
         FIG. 5  is a flow diagram of a process for document management. 
         FIG. 6A  is a functional diagram illustrating a handheld device communicating with a website via the internet. 
         FIG. 6B  is a functional diagram illustrating a watermark decoder capturing a watermark displayed on a handheld computing device screen. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure provides increased flexibility through digital watermarking technology. The following section describes a computing device capable of supporting watermarking software and/or functionality. (It should be appreciated that the illustrated device is only one possible computing platform. There are many others capable of supporting watermark embedding and decoding. It is also anticipated that there will be advances in the handheld computing field, and such advances may be suitably interchangeably incorporated with aspects of the present invention.). 
     Handheld Computing Device 
     A typical handheld device (also call a Personal Digital Assistant or PDA) can function as a cellular phone, fax sender, and personal organizer. Some PDAs are hand-held PC with tiny keyboards. Another device uses a touch-screen and stylus for data entry. 
     A handheld computing device  10  is now described with reference to  FIG. 1 . The device  10  preferably includes a processor  12  or other processing circuitry. One common processor is the 206 MHz Intel StrongArm, a 32-bit RISC processor. Of course, many other processors, like those made by Motorola, can alternatively be used. Indeed, as with other components discussed herein, it is anticipated that improvements will be made with respect to handheld processors. For example, the computation power and processing speed of handheld processors will surely continue to increase. Such improved components may be suitably interchanged with the present invention. 
     Memory  14  is preferably provided in the device. Memory  14  can include RAM (e.g., SDRAM), ROM, flash memory, optical, and/or magnetic memory. Device  10  can also communicate with external or expansion memory. 
     Device  10  also preferably includes sufficient bus structure (not shown) to facilitate communication between the various device components discussed herein. In one embodiment, device  10  includes an expansion slot  13 , which is a compartment or communication port to plug expansion cards or devices such as a video card, wireless or satellite modem, additional memory, GPS receiver, sound card, etc., and connect them to the system bus structure. (Of course, GPS refers to a Global Positioning System, which is satellite-based radio positioning system that provides three-dimensional position, velocity and time information to a GPS receiver, anywhere on or near the surface of the Earth.). 
     Device  10  can include a plurality of output devices. For example, device  10  can include a display area  16  (e.g., a LCD screen, thin film LCD, etc.), communication port  18 , speaker  20 , wireless transceiver  22 , and printer  24 . (Of course, not all of these components are necessary, and may be included as optional features or plug-in devices.). The communication port  18  may include a single or a plurality of ports, for example, an infrared port, serial port (e.g., RS 232 serial port), parallel port, synchronization port, Universal Serial Bus (USB), etc. Communication port  18  may be used to communicate with peripherals (e.g., web cameras, digital camera, cell phones, modems, a computer network, a stand alone computer, scanner, GPS receiver, etc.) or with a host computer. In one embodiment, communication port  18  includes an audio/video output jack or port. 
     Wireless transceiver  22  may support a variety of communication platforms, and may even include cell phone or satellite transmission capabilities. (Alternatively, a cell or satellite phone communicates with device  10  via communication port  18  or expansion slot  13 ). 
     In one embodiment, wireless transceiver  22  communicates with a computer network, using a communication protocol such as Bluetooth. As will be appreciated by those skilled in the art, Bluetooth is a wireless communication technology that allows mobile phones, personal digital assistants (PDAs), PCs and other electronic devices to talk to each other. Bluetooth is a specification for small form factor, low-cost, short-range radio links between a variety of portable and mobile computing devices. For more information, see the Bluetooth Special Interest Group web site at www.bluetooth.com. Of course, device  10  may support other communication standards, besides Bluetooth. 
     In one embodiment, wireless transceiver  22  communicates with a host computer  40  to establish an internet or other network connection ( FIG. 2A ). In another embodiment, handheld device  10  communicates directly with a dial-up or internet service provider, via a mobile phone, modem or wireless connection. In some embodiments, a peripheral device (e.g., a camera, web cam, scanner, GPS, transceiver, optical sensor, imaging sensor, mouse, keyboard, etc.) communicates with a host computer  40 , which then relays the peripheral signal to handheld device  10  ( FIG. 2B ). In still another embodiment, a peripheral device  42  communicates directly with the handheld device ( FIG. 2C ). 
     Printer  24  is an optional component, which may be integral to device  10 , or may be in communication with device  10 . Printer  24  may include a print head or thermal printing element. Alternatively, printer  24  may include an ink-jet or laser-jet based printing system. 
     Device  10  preferably includes input devices, buttons or ports as well. For example, device  10  may optionally include a pen-touch interface to receive handwritten characters. Device  10  may also optionally include a microphone  26 , through which device  10  responds to voice activated commands or to capture audio for recording. (Of course, voice recognition software may be running to help with the voice-activation.). A fold up (or on a display screen) keyboard can also be used for data entry. (Of course, communication port  18  is another source for data entry.). In another embodiment, device  10  includes or communicates with input devices such as a scanner, mouse, keyboard, modems, wireless transceivers, etc., etc.). In another embodiment, device  10  includes a touch screen. (Device  10  may optionally include various launch buttons, which when selected, launch a particular program or software routine.). 
     Device  10  may optionally include, or communicate with, a digital camera, video capture device, web cam, optical sensor, digital eye module (such as those provided by LightSurf, Inc., etc.), etc. Such digital eye modules typically include features such as a complete camera on a chip, CMOS imaging sensor, and/or miniaturized lens and imaging software. Other imaging devices include a CCD image sensor. 
     Power can be provided to device  10  in many ways. In one embodiment, device  10  includes a battery  28 , e.g., such as a lithium-polymer battery, etc. In another embodiment, device  10  includes an energy cell, which is rechargeable. (Device  10  may also include an interface or port to receive power. USB or cradle recharging is even possible.). An on/off switch can also be provided for device  10 . (In one embodiment, software automatically shuts down the device  10  after a predetermined period of inactivity. Power is conserved as a result.). 
     Various software applications can be stored and run on device  10 . Microsoft Corp. even has a Pocket PC Windows operating system. Palm and Handspring have their own operating systems. Many other software modules and applications are supported on handheld devices, such as word processing, device drivers, internet surfing or exploring, database management, communications, personal organization software, and many, many others. 
     As will be appreciated by one of ordinary skill in the art, suitable software programming instructions executing via processor  12  can be used to affect various types of watermark embedding and detection. To increase performance, software-programming instructions can be optionally written as fixed-point based code, instead of floating-point based code. In another embodiment, only watermark embedding or detecting software-programming instructions are stored on device  10 , and executed when needed. 
     There are many other handheld devices offered by a gaggle of manufactures, which may suitably support watermarking software or watermarking functionality a few such manufacturer and products are: HP (e.g., the Jornada 520/540 series), Compaq (e.g., the iPac Pocket PC), Handspring, Inc., and Palm, Inc. Some of these handheld devices combine computing, telephone/fax and networking features. Of course, it is expected that these devices, and others, will continue to improve. Such improvement may be readily incorporated with the present invention. 
     User Applications 
     The following sections disclose various inventive methods and systems, in which device  10  executing watermarking software (decoding and/or embedding) is employed. In some cases, a networked computer, instead of a handheld device is used. (Although some of the following applications are described with reference to a handheld computing device, it will be understood that a compliant desktop or laptop computer could alternatively be employed. The term “compliant” in this disclosure implies that the device is able to embed and/or decode digital watermarks.). 
     Inventory Control 
     A compliant handheld device  10  is ideal for helping to track and manage inventory. Consider a warehouse or store with inventory (e.g., 100 widgets and 50 wobits.). The handheld device  10 , via printer  24 , prints a watermark onto each of the inventory items (see  FIG. 3 , step S 1 ). Preferably, the watermark is directly printed or impressed onto an inventory item. Alternatively, a watermark is printed on a sticker or adhesive tag that is applied to the inventory item. An inventory watermark preferably includes a unique identifier, which identifies the type of inventory item (e.g., a widget or wobit), and optionally, an item number identifier (e.g., widget number  26 ). In another identifying scheme, each inventory item is uniquely identified. Unique identifiers, representing inventory items, can be maintained in an inventory list (step S 2 ). Of course, database management software can be used to help manage and update the inventory list. 
     The printing of the watermark can encompass artwork or printing on the inventory item or tag, the printed background, numbering, lines on the item or tag, a laminate layer applied to the item or tag, surface texture, etc. If a photograph, line design, or drawing is present, it too can be encoded. A variety of watermark encoding techniques are detailed in the patent documents discussed herein; artisans in the field know many more. 
     Device  10  can maintain an inventory listing for each printed tag. Of course, device  10  can maintain a subset of inventory information as well. Alternatively, device  10  can communicate with a central computer  40 , which maintains the inventory listing. Checkout stations, roving cashiers, and inventory controllers can carry or be equipped with compliant computing devices. These devices track inventory (e.g., by reading the embedded watermark, extracting the identifier(s), and recording or communicating activity) as it is shelved, shipped, returned and/or sold (step S 3 ). For example, a cashier with a compliant device reads a watermark as an inventory item is purchased. The unique identifier and, optionally, a unit number, is extracted from the watermark. The inventory listing can be updated accordingly to reflect the purchase (or shipment, or shelving). In one embodiment, a plurality of handheld devices is in communication with a host computer. Changes in inventory can be updated in real-time. In another embodiment, compliant devices periodically communicate with the central computer. In still another embodiment, a handheld computing device maintains the central database. Inventory can be tracked efficiently as such. 
     Verification Aids for the Seeing Impaired 
     Another method and system that is particularly well suited for practice with a compliant handheld device involves watermarking monetary objects (e.g., currency, bills, coins, treasury bonds, cashier&#39;s checks, traveler&#39;s checks, notes, food stamps, etc.). Monetary objects are watermarked to indicate denomination, such as the amount of the object. In one embodiment, a watermark payload indicates that a five-dollar bill, is in fact, a five-dollar bill. Alternatively, in another embodiment, the watermark itself identifies the respective type of monetary object. Optionally, a monetary object is digitally watermarked to include the source of the object, e.g., U.S., Euro, France, Mexico, etc. 
     A monetary object is present to a compliant reading device, such as a handheld device  10  (see  FIG. 4 , step S 10 ). The compliant device reads a digitally watermarked monetary object, and extracts the denomination information (step S 11 ). The denomination information is handled by the compliant reading device (or a device in communication with the compliant device), which provides feedback to a user (step S 12 ). 
     In one embodiment, the compliant reading device includes audio or voice synthesis, which announces the monetary denomination (e.g., announces “ten dollars,” when a ten dollar bill is decoded). In another embodiment, the compliant reading device communicates with a Braille output device, which signals the monetary object&#39;s size. (Other textile-based feedback can alternatively be provided.). A seeing impaired individual is no longer dependent upon a potentially unscrupulous cashier when making payments or receiving change. Instead, the individual digitally reads the embedded watermark to determine currency size and/or type and receives an audible (or other) indication of bill or currency size. 
     To implement such, watermark payload bits are set to identify corresponding currency. When decoded by a compliant device, the payload bits are used by a device to index a predetermined wave (or audio) file. The file can be rendered or played to announce the corresponding bill (or other monetary object) size. The payload bits can be feed directly to an audio-synthesis chip. The audio-synthesis chip can be alternatively preprogrammed to respond to various payloads. For example, the payload bits of a five dollar bill trigger an audio synthesis of “five” or “five dollars,” etc. Alternatively, the payload bits can be handled by software, which activates a feedback device to provide predetermined feedback based on the payload bits. The feedback can be changed from time to time, but is still triggered based on the payload. In another embodiment, the type of watermark, and not the payload, triggers like functionality. 
     (Although this embodiment is particularly well suited for handheld devices, the present invention is not so limited. Indeed, a cashier station or checkout stand could be equipped with a compliant reading device, which is available to seeing impaired individuals. The compliant device can be periodically inspected to ensure that it is providing accurate results. The complaint device could decode the watermark and respond accordingly, e.g., announce bill size based on the type of watermark, or on a watermark&#39;s payload. A compliant device could also be internet-based, for example, using Digimarc MediaBridge technology. The monetary object identifier is decoded and provided to a Digimarc server (e.g., an online server). The watermark identifier is associated with a URL or other information. The URL or other information includes the corresponding correct feedback to be provided to the user. In this case, an audio signal or file can be provided to announce the denomination. In still another embodiment, a signal from the corresponding URL server activates a Braille or other output device.). 
     Street signs, restaurant menus, grocery store isles (and goods) can be watermarked to provide similar feedback. In this case, a sign, menu or item can be embedded with a unique identifier. A compliant device can extract an identifier, which it relays (e.g., via a wireless or other communications channel) to a central database. The central database retrieves related information (audio files, Braille enabling commands, etc.) and communicates such to the querying device. In one embodiment, the database is accessed via the internet. In another embodiment, a handheld device includes a library or database of identifies and related information. In this case, the handheld device need not query an online database, but may look to its stored database. 
     Document Management System 
     Digital watermarks may also be used to help manage documents and provide quality assurance. As will be appreciated, there are several document-management and quality assurance standards in place. ISO 9000 is one example. There are many others. Some such standards mandate that only the most recent version of a printed document be retained, a document history be maintained, and/or security be implemented. 
     Consider the following embodiment. Each time a document is printed, an identifier is steganographically embedded therein in the form of a digital watermark. The identifier identifies document data, e.g., such as a document file name, document version number, creation and/or print time, author, edited by, printer location, etc. (Once obtained, this document data can either be contained in the embedded watermark itself, or contained in a database to which the watermark represents a pointer, or both.). A database can be used to track documents and revisions to such, based on unique identifiers assigned per print, or edit, or session, or etc. 
     A printed, watermarked document then becomes a portal to related information, or a gatekeeper to help track document history. Consider a typically office situation, in which documents are printed and then edited/updated, and where several people have access to an electronic copy of the document. A user presents a printed document to a compliant device. An image of the document is captured by an input device, e.g., via digital camera, optical sensor, laser scanner, web cam, digital eye, CCD or CMOS imaging sensor, or scanner. The embedded watermark is decoded from the captured image. Related information can then be determined from the database. For example, the extracted watermark information uniquely identifies the document, e.g., via the document data. If the document is in an electronic form, it to can be digitally watermarked. The watermark can be used to track and identify the document. 
     In one embodiment, the document data is compared with the database information to determine whether the printed copy is the most recent copy. Additional information can be determined as well. For example, the author of the latest revisions can be identified, upcoming deadlines, or sensitive conditions (e.g., contract terms or confidentiality agreements) can be presented to the user. (Preferably the compliant computing device includes a user interface, through which such information is relayed. In another embodiment, such information is communicated to a user&#39;s designated handheld device.). 
     Now consider an embodiment implemented in a business or home-office environment. Say a business team is meeting in conference room B, on the first floor of a building. In the meeting, it becomes apparent that not everyone in the group has the same documentation. Luckily, the needed documents are watermarked with document identifiers. The watermarked documents are presented to a compliant device, which extracts and decodes the respective document identifier (see  FIG. 5 , step S 20 ). A user interface allows the meeting participants to select a printing option and printing location. (In the case of a handheld device, the device communicates, perhaps wirelessly, with a network communication port. The user interface may reside on the handheld device itself.). The identifiers are associated in a network-accessible database according to corresponding electronic documents. An extracted, watermark identifier is used to interrogate the database to find an associated, or corresponding, electronic document (e.g., a Word file, Excel spreadsheet, PDF file, etc.). Network routing software determines a printer nearest (or convenient) to the compliant device and renders the electronic document to the printer for printing. Optionally, a message is communicated to the compliant device, indicating the printing location. 
     So-called fragile watermarks can be embedded within a document. A fragile watermark can be designed to be lost, or to degrade predictably, when the data set into which it is embedded is processed in some manner. Thus, for example, a fragile watermark may be designed so that if an image is JPEG compressed and then decompressed, the watermark is lost. Or if the image is printed, and subsequently scanned back into digital form, the watermark is corrupted in a foreseeable way. (Fragile watermark technology is disclosed, e.g., in commonly assigned applications Ser. Nos. 09/234,780, 09/433,104 (U.S. Pat. No. 6,636,615), Ser. No. 09/498,223 (U.S. Pat. No. 6,574,350), 60/198,138, Ser. Nos. 09/562,516, 09/567,405, 09/625,577 (U.S. Pat. No. 6,788,800), Ser. No. 09/645,779(U.S. Pat. No. 6,714,683), and 60/232,163.). By such arrangements it is possible to infer how a data set has been processed by the attributes of a fragile watermark embedded in the original data set. 
     In one embodiment, a second watermark is embedded along with a fragile watermark in a document. The second watermark can include information pertaining author, printer, document version, user, etc. In this embodiment, when a compliant device decodes a document, and the fragile watermark is not detected, the document is determined to be a copy or duplicate. Information from the second watermark can be used to identify the source of the document. (The printer or user can be identified to determine a potential security breach.). 
     Event Tickets 
     Movie and other event tickets may be purchased on-line from various sources. A ticket may comprise many forms, including an authorization code, digital image, audio signal, text file, and digital signal. The ticket preferably includes a unique identifier or purchase code embedded therein. In one embodiment, the ticket is transferred to a purchaser&#39;s handheld device. Alternatively, the online movie ticket retailer transmits a ticket in the form of a payload, authentication code, or digital file to the user&#39;s computer. A plug-in on the user&#39;s computer is launched, which incorporates the ticket information when creating a watermarked image. (A handheld device can directly communicate with an online website, as shown in  FIG. 6A , to retrieve a ticket. Or the handheld device can communicate with the website via a host computer, as shown in  FIG. 2A .). 
     As noted in Assignee&#39;s U.S. Patent Application 60/257,822, filed Dec. 21, 2000, a watermarked image can be presented on the LCD display, and captured by a web cam for various purposes. Accordingly, in a preferred embodiment, a watermarked ticket image is displayed on a handheld device. 
     At the movie theater, the ticket purchaser presents the handheld device, showing the watermarked image on the display screen, to a compliant watermark decoder  50 , as shown in  FIG. 6B . The decoder verifies authentic tickets by opening a gate or enabling a visual confirmation, e.g., a green light, or via a graphical user interface and/or with human intervention. The movie theater decoder can download a list of authentic payloads or identifiers prior to each movie showing or session, may query an online database to verify each ticket. The extracted identifier can be compared to the authentic identifiers to confirm a valid ticket. When the ticket identifier matches one of the authorized identifiers, the ticket is verified, and entry is permitted. 
     (Fragile watermarks are alternatively embedded in the electronic ticket to help avoid counterfeiting.) 
     Credit at a concession stand (or coupons for such) can be obtained by techniques like those above. 
     In still another embodiment, a movie or event poster (or flyer, advertisement, etc.) is digitally watermarked to include related event information, or a pointer to such information. A compliant handheld device extracts the embedded watermark information. In a first embodiment, an extracted watermark pointer (or index) is used to interrogate a database point to a web address (e.g., via a URL). The database (or web site) may include data records, including related event information. For example, for a movie poster, the related information may include ticket purchase information, trailers or clips, movie reviews, behind the scenes information, and much, much more. The database can be accessed via the internet, or via a network system. Alternatively, a database can be downloaded onto the handheld device. 
     Unique Device Identifiers 
     A handheld device can be configured to have a unique device identifier, presented via its display. Typically, a handheld device display comprises a plurality of pixels. In one embodiment, a microlens is added for each pixel, or a subset of the plurality of pixels. (Some so-called “camera-on-a-chip” devices are currently equipped with microlenses. These camera-on-a-chip devices use an all-CMOS process to build both a sensor array and additional on-chip signal-processing logic. In one example, the sensor array is organized as a 1,280×1,024 array, which corresponds to the higher resolution SXGA standard. A microlens for each pixel is added to enhance sensitivity, and provided for special color filter arrays.). 
     For handheld devices, the microlenses can be used to vary luminance of pixel elements. Indeed, the microlens can polarize light, e.g., in a horizontal and/or vertical direction. Microlenses can be arranged to create a pattern of horizontal and/or vertical polarizations. A unique device identifier can be determined from the pattern. (In a first embodiment, a pattern can be constructed to steganographically hide data, e.g., a device identifier. In another embodiment, the pattern mathematically corresponds with a device identifier. In still another embodiment, the pattern reveals a series of binary signals, which are used to determine the device identifier. In yet another embodiment, a Fourier analysis of the pattern reveals information used to determine the identifier. Artisans in the field know other ways to correlate a pattern with an identifier. Such may be suitably employed with the present invention.). 
     To an unfiltered eye (or camera), the polarized display appears normal. The various horizontal and/or vertical polarizations are typically undetected. 
     Adding a polarized filter, however, reveals the polarized luminance pattern. In this embodiment, an input device, e.g., a camera, web cam, optical sensor, imaging sensor, etc., includes a filter (e.g., a polarized filter, a luminance filter, etc.), which exposes the polarized pattern. An input device captures an image of the handheld device display (e.g., as shown in  FIG. 6B ). The captured image includes a polarized pattern, which includes (or hides) a unique device identifier. In the preferred embodiment, software is used to analyze a pattern and discern the corresponding device identifier. 
     In another embodiment, the device identifier is dynamic, in that it can change. To accomplish such, a set of microlens includes a bus structure (or energy receptacles) to receive electricity or energy (hereafter both referred to as “energy”). Energy is applied to the set of microlens to change their respective polarizations. The polarization pattern is thereby changed. Accordingly, the unique identifier can be changed. Software, running on the handheld device can be used to provide an interface to help change the unique identifier. 
     There are many applications involving such a device identifier. For example, referring to the “Event Tickets” section above, a user could present her handheld device when purchasing tickets. A filtered image of the handheld device display is captured to determine the unique device identifier. The watermarked ticket image (or authorization code) includes the corresponding device identifier. At the event location (e.g., movie theater), the watermarked ticket image is displayed via the polarized display. An image of the display is captured. The captured image (e.g., of the watermarked ticket image) is decoded to extract both the ticket authorization identifier and the polarized device identifier. An image of the display can be captured via a polarized-filter input device, which can be used to determine the unique device identifier. (Of course, one input device can also be used with different filters or a filter that allows both polarization filtering and typical image capture.). The decoded device identifier is compared with the captured device identifier. If they match, then entry is allowed (assuming the authorization matches.). In one embodiment, the embedded ticket authorization is the corresponding device identifier. 
     As a copy control, multi-media content can be bound to a particular handheld device via the device&#39;s display identifier. 
     A device identifier can be used in a security system or network access. For example, verifying the device display identifier is one step in a security system. (Such a system may also include entry of a PIN or password, etc.). 
     Of course there are many other applications with respect to uniquely identifying a handheld device via a polarized display. 
     Handheld Devices as Scanners 
     A handheld device equipped with, or in communication with, a digital camera or web camera, can be used as an image scanner. A digital or web camera captures image patches or swatches. Assuming a watermarked document is imaged, the captured pieces can be stitched back together to form the original image. 
     The watermark is embedded to include using an orientation or grid signal. The grid signal is redundantly embedded within a document. The grid signal can be key on, and used as a template when stitching pieces together. Specifically, image pieces or swatches can be oriented according to the grid signal, and then matched with adjacent pieces. 
     Accordingly, a handheld device (and an input device, e.g., a web cam) becomes a scanner. 
     Conclusion 
     The foregoing are just exemplary implementations using digital watermarking technology. It will be recognized that there are a great number of variations on these basic themes. The foregoing illustrates but a few applications of the detailed technology. There are many others. 
     While this application discusses a handheld computing device, the present invention is not so limited. Of course, a compliant device may include a desktop or laptop computer, or even a compliant kiosk. 
     U.S. Patent Application 60/257,822, discussed above, discloses the following: “In applications Ser. Nos. 09/670,114 and 09/151,492, the present assignee detailed how watermarks can be employed on everyday objects, such as wristwatches, and serve to enable additional features. The detailed embodiments noted that a watermark pattern can be engraved into an exterior surface of such an item. But other arrangements are possible. Consider digital watches, or other devices with electronic displays. A watermark pattern can be formed by the display itself, by controlling individual pixels accordingly. Different patterns can be made to appear on the screen in order to provide different functionality. Taking the case of a digital wristwatch, it is familiar that many different features and modes can be set by manipulation of a few simply user interface controls—such as buttons. In accordance with this aspect of the invention, one mode can set the watch to display a first watermark pattern. The user can present the wristwatch display to a webcam, which senses the displayed pattern, decodes the watermark therefrom, and triggers a corresponding action. The action corresponding to the first watermark pattern can be to link an associated internet device to a personalized web site relating to the user&#39;s fitness training (e.g., as further detailed in the &#39;114 application). Similarly, by further manipulation of the device&#39;s user interface, a second watermark pattern can be made to appear on the watch display. When this pattern is sensed by a webcam, a different response can be triggered (e.g., access to a web-based email account associated with the user). While the responses just-detailed are tailored to the particular user, other patterns can trigger responses that are the same for a class of users, or for all users. Examples include linking to CNN headlines, weather information, etc., etc. To trigger custom responses, custom watermark payloads—unique to that user—can be employed. This can be achieved by device serialization, e.g., assigning each wristwatch a different ID number, and deriving unique watermark payloads from such ID. (Suitable measures must be taken to assure that user privacy is respected.) Another way of triggering user-customized responses does not rely on serialization of the wristwatch. Instead, the responding- or linking-system (e.g., a PC, camera-equipped cell phone, etc.) can include data specific to the user. Thus, all wristwatches may display the same watermark pattern when put in the “link-to-personal-training-website” mode. John&#39;s computer can respond to this payload by linking to www.address.com/john_fitness, whereas Jane&#39;s computer can respond to this same payload by linking to www.address.com/jane_fitness.html - based on customization data resident in the associated device. One advantage to such an arrangement is that the wristwatch housing does not need to be custom fabricated. Another is that the watermark can be controlled to present a number of different payloads, rather than a single, unchanging, payload.” 
     To provide a comprehensive disclosure without unduly lengthening this specification, the above-mentioned patents and patent applications (excluding application Ser. Nos. 09/670,114 and 09/151,492) are hereby incorporated by reference. The particular combinations of elements and features in the above-detailed embodiments are exemplary only; the interchanging and substitution of these teachings with other teachings in this application and the incorporated-by-reference patents/applications are also contemplated. 
     The above-described methods and functionality can be facilitated with computer executable software stored on computer readable mediums, such as electronic memory circuits, RAM, ROM, magnetic media, optical media, removable media, etc. Such software may be stored on a handheld reading device. Instead of software, the watermarking functionality may be hardwired. 
     The section headings in this application (e.g., “Handheld Computing Device”) are provided merely for the reader&#39;s convenience, and provide no substantive limitations. Of course, the disclosure under one section heading may be readily combined with the disclosure under another heading. 
     In view of the wide variety of embodiments to which the principles and features discussed above can be applied, it should be apparent that the detailed embodiments are illustrative only and should not be taken as limiting the scope of the invention. Rather, we claim as our invention all such modifications as may come within the scope and spirit of the following claims and equivalents thereof.