JP2006295249A - Service providing method and broadcast reception terminal capable of utilizing the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a service providing method capable of providing limited services to viewers and to provide a broadcast reception terminal capable of utilizing the method. <P>SOLUTION: A reception section 10 receives a data broadcast separately from a main broadcast. A watermark image acquisition section 40 stores an advertisement image acquired from the data broadcast to a memory 50. The advertisement image is distributed over a program broadcast time zone for several number of times, and when a user views the program, a plurality of advertisement images are automatically stored in the memory 50. A watermark extract section 60 extracts a watermark from each of the advertisement images stored in the memory 50. The watermark extract section 60 carries out a chain watermark extraction using a decryption key wherein a decryption key extracted as a watermark from a preceding watermark image in the distribution order is utilized for extracting a watermark of a succeeding watermark, extracts a chain watermark using the decryption key, and extracts service identification information SID required for a particular service from the advertisement image finally distributed as a watermark. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a service providing technique using data broadcasting, and more particularly to a service providing method using digital watermark and a broadcast receiving terminal capable of using the method.

  Mobile phones and car navigation systems that have the function of receiving terrestrial digital television broadcasts have entered the practical stage. Digital terrestrial television broadcasts can provide various services to viewers using data broadcasts. . When a broadcast station provides a service such as a present to a viewer, a method is generally used in which a service receiving method is guided during a program broadcast, and the viewer applies for the service by postcard or telephone. The same applies when a program sponsor provides a specific service to viewers through advertisements broadcast before, during or after the program.

In Patent Document 1, a synthesized sound electrical signal obtained by synthesizing coupon data with an audible sound signal of an advertisement is transmitted by broadcasting, and coupon data extracted from the broadcast synthesized sound electrical signal is transmitted from a broadcast recipient via a computer network. Disclose the receiving system.
JP 2002-150102 A

  Broadcasters and advertisers want to increase the audience rating of programs and increase the advertising effectiveness of advertisements by giving privileges only to those who have seen the program or advertisement. However, when the method of guiding the application procedure for services through programs and advertisements as described above is adopted, even if a person who has not viewed the program or advertisements knows the application procedure from other information routes. You can apply for the service. For this reason, there is a problem that it is impossible to provide a service limited to program viewers.

  Another problem is that even a viewer who knows the procedure for applying for a service through a program or advertisement does not always watch the program from the beginning to the end, but only during the time period when the service is announced. May not be watching. If you can enjoy the service without viewing the entire program, you will not be able to motivate viewers to view the entire program, and providing services such as gifts will not necessarily improve the audience rating of the program or promote it through advertising. Does not lead to increased effectiveness.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a service providing method capable of providing a service limited to viewers and a broadcast receiving terminal capable of using the method.

  In order to solve the above problem, a broadcast receiving terminal according to an aspect of the present invention includes a watermark image acquisition unit that acquires a plurality of watermark images distributed using a data broadcast band during a broadcast time period of a broadcast program, and an acquisition A watermark extracting unit that extracts a watermark from each of the plurality of watermark images using a decryption key. The watermark extraction unit extracts the decryption key from one watermark image as a watermark, and uses the extracted decryption key to extract a watermark from another watermark image, thereby extracting the decryption key from the plurality of watermark images. The used chained watermark extraction is performed, and service identification information necessary for using a specific service is extracted as a watermark from the last watermark image in the chain.

  Another aspect of the present invention is also a broadcast receiving terminal. The broadcast receiving terminal uses the image capturing unit that captures a plurality of watermark images and the watermark extraction program distributed using the data broadcast band during the broadcast time zone of the broadcast program to capture the image captured by the image capturing unit. By combining a watermark extraction unit that extracts a watermark from each of a plurality of watermark images and a watermark extracted from each of the plurality of watermark images, service identification information necessary for using a specific service is generated. And a synthesis unit.

  Yet another embodiment of the present invention is also a broadcast receiving terminal. The broadcast receiving terminal includes a watermark image acquisition unit that acquires a watermark image in which identification information of the broadcast program is embedded as a watermark, and is distributed using a data broadcast band in a broadcast time zone of the broadcast program, and the broadcast reception A watermark embedding unit that further embeds the terminal identification information and the information related to the acquisition date and time of the watermark image in the watermark image as a watermark. The identification information of the broadcast program is originally embedded as a watermark in the watermark image, but the identification information of the broadcast receiving terminal and information regarding the acquisition date and time of the watermark image are further embedded as a watermark, so that the watermark image is embedded. Becomes an image with a double embedded watermark. You may further include the display part which displays this double watermarked image.

  Yet another embodiment of the present invention is a service providing method. This method acquires a plurality of watermark images that are intermittently distributed using a data broadcast band in a broadcast time zone of a broadcast program in the order of distribution, extracts a decoding key as a watermark from the previous watermark image in the distribution order, By using the extracted decryption key for the next watermark image in the distribution order, chained watermark extraction using the decryption key is performed from the plurality of watermark images in the order of distribution, and specified from the last distributed watermark image Service identification information necessary for using the service is extracted as a watermark.

  Yet another embodiment of the present invention is also a service providing method. This method uses a watermark extraction program distributed using a data broadcast band during a broadcast time of a broadcast program, extracts a watermark from each of the plurality of watermark images taken, and extracts the extracted watermark By combining, service identification information necessary for using a specific service is acquired.

  Yet another embodiment of the present invention is also a service providing method. This method obtains a watermark image in which broadcast program identification information is embedded as a watermark distributed using a data broadcast band in a broadcast time zone of the broadcast program, and identifies the broadcast reception terminal identification information and the watermark The image data necessary for using a specific service is generated by further embedding information on the acquisition date and time of the image in the watermark image as a watermark.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, and the like are also effective as an aspect of the present invention.

  According to the present invention, it is possible to provide a service limited to viewers of broadcast programs.

Embodiment 1
FIG. 1 is a configuration diagram of a broadcast receiving terminal 100 according to the first embodiment. These configurations can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a digital watermark extraction function loaded in the memory. Here, functional blocks realized by the cooperation are depicted. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  The receiving unit 10 receives and demodulates a broadcast wave transmitted from a broadcast station. The receiving unit 10 provides the demodulated image signal to the image decoding unit 20. The image decoding unit 20 decodes the image signal, reproduces the image, and gives the image to the display unit 30. The display unit 30 outputs the reproduced image on the screen.

  The receiving unit 10 receives a data broadcast that flows in the data broadcast band separately from the main broadcast. Data broadcasting is used to provide various information related to the program and information such as advertisements during the program of the main broadcast. The user can view information related to the program distributed as data broadcasting, advertisement images, and the like on the display screen during the time period when the program is being viewed.

  In this embodiment, an advertisement image in which a digital watermark is embedded and a watermark extraction program are distributed as data broadcasting. The watermark image acquisition unit 40 stores the advertisement image received by the reception unit 10 in the data broadcast band in the memory 50. The advertisement image is distributed several times during the broadcast time of the program, and a plurality of advertisement images distributed while the user is viewing the program are automatically stored in the memory 50. The watermark extraction program received by the receiving unit 10 in the data broadcast band is supplied to the watermark extracting unit 60.

The watermark extraction unit 60 extracts a watermark from each of a plurality of advertisement images P _i (i = 1, 2,..., N) stored in the memory 50 using the watermark extraction program supplied from the reception unit 10. To do. Since the watermark is embedded in the advertisement image using the encryption key, in order to extract the watermark from the advertisement image, it is necessary to provide the decryption key as an input of the watermark extraction program.

The watermark extraction unit 60 uses the i-th decryption key K _i to extract the (i + 1) -th decryption key K _{i + 1} as a watermark from the i-th advertisement image P _i . The extracted (i + 1) -th decryption key K _{i + 1} is held in the memory 50 and is used when the watermark extraction unit 60 extracts a watermark from the (i + 1) -th advertisement image P _{i + 1} . In this way, the watermark extraction unit 60 performs chained watermark extraction using a decoding key, in which the decoding key extracted as a watermark from the previous watermark image in the distribution order is used for watermark extraction from the next watermark image. .

The watermark extraction unit 60 extracts the service identification information SID necessary for using a specific service from the advertisement image P _n distributed last as a watermark, and provides the service identification information SID to the transmission unit 90. The transmission unit 90 transmits the service identification information SID to the server by wireless data communication.

  As described above, when a plurality of advertisement images distributed during the program broadcast are stored in the memory 50, the broadcast receiving terminal 100 extracts a watermark in a chain manner from the plurality of stored advertisement images using a decryption key. The service identification information SID is acquired from the advertisement image distributed last. The user can enjoy a specific service by transmitting the obtained service identification information SID to the server. For example, the user transmits service identification information SID to the server, thereby downloading a digital content such as music or video from the server, or acquiring a coupon for purchasing a product provided by a program sponsor at a discount. Will be able to receive.

FIG. 2 is a diagram for explaining the relationship between the main broadcast and the data broadcast received by the receiving unit 10. In the example of the figure, the main broadcast program is broadcast in the time zone from 20:00 to 21:00. In this example, the watermark extraction program 200 is distributed at 20:00 of the start time of the program, and still images are displayed as a plurality of advertisement images intermittently at 20:10, 20:20, 20:35, and 20:50. P ₁ , P ₂ , P ₃ , and P ₄ are distributed (reference numerals 201 to 204). Further, the decryption key K ₁ to be used for the watermark extraction from the first still image P ₁ at 21 the end time of the program is delivered (code 205).

While the user is viewing the main broadcast program, the watermark extraction program 200 distributed by the data broadcast, the still images P _{1 to} P ₄ (reference numerals 201 to 204), and the decryption key for the first still image P ₁ Each data of K ₁ (symbol 205) is stored in the memory 50. When the user stops watching the program of the main broadcast or starts watching from the middle of the program, only a part of the data distributed by the data broadcast can be acquired.

FIG. 3 is a diagram illustrating a procedure in which the watermark extraction unit 60 acquires the service identification information SID by sequentially extracting watermarks from a plurality of still images P _{1 to} P ₄ . The watermark extraction unit 60 _first uses the decryption key K ₁ (reference numeral 205) for the still picture P ₁ to watermark the decryption key K ₂ (reference numeral 206) for the still picture P ₂ from the still picture P ₁ (reference numeral 201). Extract as

Next, the watermark extraction unit 60 uses the still image P ₂ decryption key K ₂ (reference numeral 206) to use the still picture P ₂ (reference numeral 202) to the still picture P ₃ decryption key K ₃ (reference numeral 207). Is extracted as a watermark.

Similarly, the watermark extraction section 60, the decryption key _{K 3} for still image _{P 3} using (code 207), the still image _{P 3} decoding key _{K 4} for still image _{P 4} from (code 203) (reference numeral 208) Is extracted as a watermark. Finally, the watermark extraction section 60 uses the decoding of the still image _{P 4} key _{K 4} (reference numeral 208), and extracts the last still picture _{P 4} the service ID from the (code 204) (reference numeral 209) as a watermark.

  In this way, since service identification information is acquired by performing watermark extraction from a plurality of distributed advertisement images in the order of distribution, the user can stop watching the program halfway or watch only a part of the program. Users who do not have access to service identification information.

There are several possible variations in the procedure for extracting watermarks in a chain from a plurality of advertisement images. For example, in the procedure of FIG. 3, in order to extract the watermark from the first still image P _1, but requires a decryption key K _1, as from the beginning of the still image P ₁ can be extracted without decoding key watermarks The watermark embedding method may be changed. In this case, in FIG. 2, since it is not necessary to distribute the first still picture decryption key K ₁ at the end time of the program, the extraction of the watermark can be started from the time when the still picture P ₁ is received. At the time when each of the still images P ₂ , P ₃ , and P ₄ is received, the watermark can be extracted in real time using the decryption key extracted from the previous still image, and the last still image P delivered _The service identification information can be acquired immediately when ₄ is received.

  Further, the order of extracting watermarks in a chain is not necessarily the distribution order. The order of advertisement images from which watermarks are extracted may be stored in the distributed watermark extraction program, and watermarks may be extracted from a plurality of advertisement images in accordance with the order specified in the extraction program. In this embodiment, the watermark extraction program is acquired as part of the data broadcast. However, the watermark extraction program may be installed in the broadcast receiving terminal 100 in advance. In this case, the work of acquiring the watermark extraction program from the data broadcast becomes unnecessary. Also, a watermark extraction program may be acquired in advance using a memory card or the like.

  According to the present embodiment, a plurality of still images such as advertisement images with watermarks are distributed in the broadcast time zone of the program using data broadcasting linked to the program of the main broadcast. Therefore, the user cannot acquire all the still images unless the broadcast receiving terminal 100 views the main broadcast program from the beginning to the end. Service identification information for finally receiving a specific service is obtained by extracting watermarks from a plurality of still images distributed in the program, so that it is specified only for users who have watched all the programs. Can provide services. Also, by embedding the service identification information as a watermark in the advertising medium, the opportunity for the user to view the advertisement increases, and the advertising effectiveness can be enhanced.

Embodiment 2
FIG. 4 is a configuration diagram of the broadcast receiving terminal 100 according to the second embodiment. The broadcast receiving terminal 100 according to the first embodiment acquires the watermark image from the data broadcast, but the broadcast receiving terminal 100 according to the second embodiment acquires the watermark image by photographing. The components common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  The receiving unit 10 receives a watermark extraction program from the data broadcast and gives it to the watermark extraction unit 60. The image capturing unit 35 captures an image with a watermark using a CCD (Charge-Coupled Device) camera attached to the terminal and supplies the image to the watermark image acquisition unit 40. The watermark image acquisition unit 40 stores the captured watermark image in the memory 50.

The watermark extraction unit 60 uses the watermark extraction program supplied from the reception unit 10 to generate a watermark W _i from each of a plurality of watermark images P _i (i = 1, 2,..., N) stored in the memory 50. Is extracted and stored in the memory 50.

Service ID combining unit 70 combines the plurality of watermark W _i which is held in the memory 50, generates a service identification information SID, giving to the transmission unit 90. The transmission unit 90 transmits the service identification information SID to the server by wireless data communication.

  In the second embodiment, as an example, the following service is provided to the user.

(1) Stamp rally During the program broadcast, the program viewers are guided to hold the stamp rally using the data broadcasting band. In general, the stamp rally collects stamps by visiting a plurality of designated places, and presents the collected stamps to give a user some kind of privilege. In this embodiment, this stamp rally is realized electronically using a watermark image.

  The broadcast station distributes the watermark extraction program to the broadcast receiving terminal 100 by data broadcasting to the viewers of the program. The user carries the broadcast receiving terminal 100, visits a plurality of designated places, and photographs the printed matter presented at the places with a CCD camera attached to the broadcast receiving terminal 100 or the like.

  For example, the user takes a train, visits a plurality of designated stations, and photographs a poster presented on the premises of each station. In this poster, a station ID and a URL (Uniform Resource Locator) of a site connected to receive the service are embedded as a watermark. The captured image is stored in the memory 50 of the broadcast receiving terminal 100.

  The watermark extraction unit 60 extracts the station ID from each of the plurality of captured images stored in the memory 50 as a watermark. The service ID combining unit 70 generates service identification information SID by combining the station IDs extracted by the watermark extracting unit 60.

  In addition, the watermark extraction unit 60 acquires the URL of the service providing site from the captured image stored in the memory 50. The transmitting unit 90 accesses the URL of the service providing site and transmits the service identification information SID. The broadcast receiving terminal 100 can receive a predetermined service from the service providing site.

  The user may be configured not to generate valid service identification information SID unless the user visits all designated locations and shoots a watermark image. Moreover, you may comprise so that a service may be provided according to the number of the designated places which the user visited within the time limit.

  In the stamp rally by the broadcast receiving terminal 100 according to the present embodiment, the watermark extraction program can be downloaded using the data band, and the data corresponding to the stamp can be acquired simply by shooting a poster or the like at a designated place. The stamp rally can be performed electronically. The cost of creating a stamp collection sheet can be reduced, and the cost of checking whether a stamp has been collected can also be reduced.

(2) Sales promotion campaign Embodiment 2 can also be applied to a system for applying for a prize or the like by attaching an application ticket with a sticker to a product advertised in a program and photographing the application ticket.

  FIG. 5 is a diagram for explaining a procedure for applying for a prize by the broadcast receiving terminal 100. In this figure, a procedure for acquiring an application number by photographing an application ticket for a product by the broadcast receiving terminal 100 will be described.

  When a user watches a program broadcast on the broadcast receiving terminal 100, the user also views a product advertisement and a guide for a prize application as a data broadcast. Here, a beverage product 220 is assumed as an example of the product.

  An application ticket 222 is affixed in the form of a sticker to beverage products 220 sold at retail stores. When the user purchases the beverage product 220 and removes the seal, a printed image 224 with a pattern is printed on the back side of the application ticket 222. In the pattern print image 224, the product ID, the URL of the prize application site, and the one-digit application number are embedded as a watermark.

  The user acquires the captured image 226 by capturing the printed image 224 of the pattern with the capturing unit 35 of the broadcast receiving terminal 100. The watermark extraction unit 60 extracts the product ID, the URL of the prize application site, and the application number from the acquired photographed image 226 as a watermark. Here, “5” is extracted as the application number (reference numeral 228).

  The watermark extraction unit 60 stores the extracted product ID, the URL of the prize application site, and the application number in the memory 50.

  When the user purchases a plurality of beverage products 220 and photographs a pattern image on the back side of the application ticket, a plurality of application numbers are acquired and sequentially stored in the memory 50. In the example of FIG. 5, numbers for application are stored in the memory 50, and a number string “53741268” is formed (reference numeral 230).

  When a number string having a predetermined number of digits necessary for the prize application is formed in the memory 50, the transmission unit 90 accesses the URL of the prize application site and transmits the number string in the memory 50 together with the product ID as the application number. To apply for the sweepstakes.

  In the procedure shown in FIG. 5, the user can confirm on the display screen the number for application extracted as a watermark from the application ticket. Therefore, the user can rearrange the numbers acquired as watermarks in the order they like, or freely combine them and apply like a lottery. In addition, on the prize application site, the winning ratio of the lottery is changed depending on the number of different numbers included in the number string of application numbers, or if the number of different numbers is less than the predetermined number, contribution to product purchase It may be determined that the degree is low and excluded from the lottery.

  In the above description, a single digit number is embedded as a watermark in the application ticket, but a two or more digit number may be embedded, or an alphabet may be embedded instead of the number. It can be configured such that an application is made by acquiring some symbols such as numbers and letters from the photographed image of the application ticket as a watermark and combining the symbols.

  In the above description, the application ticket was affixed to the product as a sticker, and the watermark image was printed on the back of the application ticket. However, even if the watermark is embedded in an image such as a card provided as an appendix to the product, In addition, a watermark may be embedded in an image printed on the product packaging. However, it is assumed that the image in which the watermark is embedded is printed so that the user before purchase cannot easily take a picture.

  FIG. 6 is a diagram for explaining another application procedure for prizes by the broadcast receiving terminal 100. Unlike the procedure of FIG. 5, the user cannot confirm the application number 228 extracted from the captured image 226 by the watermark extraction unit 60. The application numbers 228 are stored in the memory 50 to form a number string 230, but the user cannot confirm the number string 230 as well. The application number 228 and the number string 230 are protected so that the user cannot refer to them (reference numeral 232). When all kinds of numbers are arranged in the number string 230, the application process is performed. In the example shown in the figure, the numbers 0, 1, 3, 4, 5, 7, and 8 have already been collected. However, since the other numbers 2, 6, and 9 are not prepared, the application process is not performed.

  Also in the procedure of FIG. 6, alphabets other than numbers may be embedded in the application ticket as a watermark. Since it is possible to apply for sweepstakes by collecting symbols of a predetermined type of numbers, letters, etc., it is possible to effectively promote the sale of products. In addition, in the procedure of FIG. 6, when a content such as a still image or a moving image is associated with a symbol such as a predetermined number or character, and the user extracts a digital watermark with a portable terminal, the extracted symbol is supported. It is also possible to provide the user with the content. Thereby, the effect which stirs the user's next purchase motivation can be expected.

Embodiment 3
FIGS. 7A and 7B are diagrams illustrating the configuration of a service providing system using data broadcasting according to the third embodiment.

  As shown in FIG. 7A, the broadcast receiving terminal 100 receives a program broadcast from the broadcast station 300. The broadcast receiving terminal 100 receives a data broadcast separately from the main broadcast program. The broadcast receiving terminal 100 receives images of merchandise and premium coupons through data broadcasting and displays them on the screen. The user saves the coupon image displayed on the screen in the memory.

  As shown in FIG. 7B, the user presents the saved coupon image on the screen and presents it to the merchandise retailer, and the reader 312 reads the coupon image at the store. Watermark information is embedded in this coupon image. The store terminal 310 transmits the coupon image as a watermark image to the watermark detection server 320 via the network. The watermark detection server 320 detects watermark information from the watermark image, verifies the validity of the coupon, and returns the determination result to the terminal 310. When the watermark detection server 320 determines that the coupon is valid, the retail store provides the user with a product or a gift.

  FIG. 8 is a configuration diagram of the broadcast receiving terminal 100 according to the third embodiment. About the structure which is common in Embodiment 1 and 2, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably. The watermark image acquisition unit 40 acquires a coupon image with a watermark from the data broadcast and stores it in the memory 50. The watermark embedding unit 80 further embeds the ID of the terminal and the saving time of the coupon image in the coupon image P as a watermark, generates a double watermark image Q, and stores it in the memory 50. The display unit 30 displays the double watermark image Q stored in the memory 50 on the screen.

  FIGS. 9A to 9C are diagrams illustrating a procedure in which the broadcast receiving terminal 100 acquires a coupon image from a data broadcast and receives a service.

  FIG. 9A is a diagram for explaining the display screen 240 of the broadcast receiving terminal 100. On the upper part of the display screen 240, a main broadcast program screen 242 is displayed. Two coupon images 244 and 246 received by data broadcasting are displayed at the bottom of the display screen. The first coupon image 244 is a coupon that allows the product “chocolate” to be purchased at a retail store with a 10% discount. The second coupon image 246 is a coupon that allows a mobile phone strap to be obtained as a prize at a specific store. In each coupon image 244, 246, the program ID of the main broadcast and the ID of the product or premium are embedded as a watermark.

  For example, the user gives an instruction to select and save the first coupon image 244 while viewing the main broadcast program using the broadcast receiving terminal 100. The watermark image acquisition unit 40 stores the first coupon image 244 selected by the user in the memory 50. At this time, the watermark embedding unit 80 reads the first coupon image 244 from the memory 50, and as shown in FIG. 9B, the first coupon image 244 storage time 250 and the terminal ID 252 are set to the first. Embedded in the coupon image 244 as a watermark and stored in the memory 50. The terminal ID 252 may be a mobile phone number when the broadcast receiving terminal 100 is a mobile phone.

  The user goes to the retail store to purchase the product, selects the first coupon image 244 held in the memory 50, displays it on the screen, and presents it to the retail store. The first coupon image 244 displayed on the screen is read by the reader 312 and input to the terminal 310 of the retail store. The terminal 310 transmits the first coupon image 244 to the watermark detection server 320. The watermark detection server 320 extracts the program ID 254, the image storage time 250, and the terminal ID 252 as a watermark from the first coupon image 244.

  Whether the watermark detection server 320 has acquired the first coupon image 244 while the user is watching the main broadcast by checking the program ID 254 and further checking whether the image storage time 250 is the program broadcast time zone. It is possible to confirm whether or not unauthorized acquisition by copying a coupon image or the like is possible.

  Furthermore, the watermark detection server 320 can determine whether or not the user is qualified to enjoy the service by checking the terminal ID 252. The watermark detection server 320 can limit the number of times the user uses the coupon by storing the terminal ID 252 in association with the coupon identification information.

  In the above description, the coupon image in which the storage time and the terminal are embedded as a watermark is displayed on the screen of the broadcast receiving terminal 100, and the coupon image is input to the store terminal 310 by the scanner, but is stored in the broadcast receiving terminal 100. The coupon image may be transmitted to the terminal 310 by some communication means such as wired or wireless communication. In the present embodiment, an example is shown in which a coupon image is displayed on a part of the data broadcasting screen, but the coupon image may be displayed using the entire area of the data broadcasting screen. In this case, the work of cutting out the coupon image from the data broadcast screen can be omitted. In this embodiment, the program ID is embedded as a watermark in the image on the data broadcast screen. However, the program ID may be embedded in a still image captured on the main broadcast screen. In this case, since the area in which the watermark can be embedded is extended not only to the data broadcast area but also to the digital area of the main broadcast, the number of embedded bits can be increased.

  According to the service providing system using data broadcasting of the present embodiment, a specific service is provided only for the user who has watched the program by providing the coupon image to the user who has watched the broadcasted program through the data broadcasting. Can be provided. In addition, by embedding the ID of the broadcast receiving terminal 100 in the coupon image as a watermark, it is possible to determine whether or not the service can be provided based on the terminal ID.

  The present invention has been described based on the embodiments. The embodiments are exemplifications, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. .

2 is a configuration diagram of a broadcast receiving terminal according to Embodiment 1. FIG. It is a figure explaining the relationship between the main broadcast and data broadcast which the receiving part of FIG. 1 receives. It is a figure explaining the procedure in which the watermark extraction part of FIG. 1 acquires a service identification information by extracting a watermark in cascade from several still images. 6 is a configuration diagram of a broadcast receiving terminal according to Embodiment 2. FIG. It is a figure explaining the application procedure of the sweepstakes by the broadcast receiving terminal of FIG. It is a figure explaining another application procedure of the prize by the broadcast receiving terminal of FIG. It is a figure explaining the structure of the service provision system using the data broadcasting which concerns on Embodiment 3. FIG. FIG. 6 is a configuration diagram of a broadcast receiving terminal according to Embodiment 3. It is a figure explaining the procedure in which the broadcast receiving terminal of FIG. 8 acquires a coupon image from data broadcasting, and receives provision of a service.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 receiving part, 20 image decoding part, 30 display part, 35 imaging | photography part, 40 watermark image acquisition part, 50 memory, 60 watermark extraction part, 70 service ID synthetic | combination part, 80 watermark embedding part, 90 transmission part, 100 broadcast receiving terminal .

Claims (8)

A watermark image acquisition unit for acquiring a plurality of watermark images distributed using a data broadcast band in a broadcast time zone of a broadcast program;
A watermark extraction unit that extracts a watermark using a decryption key from each of the obtained plurality of watermark images,
The watermark extraction unit extracts the decryption key from one watermark image as a watermark, and uses the extracted decryption key to extract a watermark from another watermark image, thereby extracting the decryption key from the plurality of watermark images. A broadcast receiving terminal that performs chained watermark extraction and extracts service identification information necessary for using a specific service from the last watermark image in the chain as a watermark.   The broadcast receiving terminal according to claim 1, wherein the plurality of watermark images are intermittently distributed during a broadcast time zone of the broadcast program.   The watermark extraction unit extracts the decryption key as a watermark from the previous watermark image in the distribution order, and uses the extracted decryption key for the next watermark image in the distribution order, thereby extracting the plurality of watermark images in the distribution order. The broadcast receiving terminal according to claim 1 or 2, wherein the chained watermark extraction using the decryption key is performed, and the service identification information is extracted as a watermark from the last watermark image in the distribution order. A shooting section for shooting a plurality of watermark images;
A watermark extraction unit that extracts a watermark from each of the plurality of watermark images photographed by the photographing unit using a watermark extraction program distributed using a data broadcast band during a broadcast time zone of the broadcast program;
A broadcast receiving terminal, comprising: a combining unit that generates service identification information necessary for using a specific service by combining watermarks extracted from each of the plurality of watermark images. A watermark image acquisition unit for acquiring a watermark image in which identification information of the broadcast program is embedded as a watermark distributed using a data broadcast band in a broadcast time zone of the broadcast program;
A broadcast receiving terminal, comprising: a watermark embedding unit that further embeds the identification information of the broadcast receiving terminal and information related to the acquisition date and time of the watermark image in the watermark image as a watermark.   A plurality of watermark images that are intermittently distributed using a data broadcast band during a broadcast time zone of a broadcast program are acquired in the order of distribution, the decoding key is extracted as a watermark from the previous watermark image in the distribution order, and the extracted decoding By using the key for the next watermark image in the distribution order, chained watermark extraction using the decryption key is performed from the plurality of watermark images in the distribution order, and a specific service is used from the last distributed watermark image A service providing method characterized by extracting service identification information necessary for performing as a watermark.   Using a watermark extraction program distributed using a data broadcast band during a broadcast time of a broadcast program, extracting a watermark from each of the plurality of captured watermark images and synthesizing the extracted watermarks A service providing method characterized by acquiring service identification information necessary for using a specific service.   Acquire a watermark image in which the identification information of the broadcast program is embedded as a watermark distributed using the data broadcast band during the broadcast time of the broadcast program, and acquire the identification information of the broadcast receiving terminal and the watermark image acquisition date and time A service providing method for generating image data necessary for using a specific service by further embedding information on the watermark as a watermark in the watermark image.

Images