CN101064840A - Snake-shaped matrix coder/decoder and visual sign coding and presenting system - Google Patents

Snake-shaped matrix coder/decoder and visual sign coding and presenting system Download PDF

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CN101064840A
CN101064840A CN 200610077040 CN200610077040A CN101064840A CN 101064840 A CN101064840 A CN 101064840A CN 200610077040 CN200610077040 CN 200610077040 CN 200610077040 A CN200610077040 A CN 200610077040A CN 101064840 A CN101064840 A CN 101064840A
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snake
visual sign
shaped matrix
sign
bit
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CN101064840B (en
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魏育成
赵军辉
薛敏宇
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NEC China Co Ltd
Renesas Electronics China Co Ltd
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NEC China Co Ltd
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Abstract

The invention discloses a snake-type matrix coder and coding method, a kind of decoder and decoding method. Said snake-type matrix coder includes: snake-type matrix generating device which is used to generate snake-type matrix whose bit capacity is 2NX2N of N2 based on bit sequence {b0, b1, b2, ...bN2-1}, said snake-type matrix generating device includes center origination unit which is used to four blocks to express bit b0, and four blocks are originated to a center ring of snake-type matrix, thereinto b0 is calibration bit, and center four blocks are calibration blocks; The second to N ring form unit, every four center symmetry blocks are used to express a bit and from the second to N ring are circumgyrated along counter-clockwise, thereinto the second ring is around center ring and the bit number of the second to the N ring are separately 3, 5, 7, ...2N-1. Said snake-type matrix possesses advantages of ring circumrotating inflexibility, so when it is used in identification code watermark technique to improve robustness. The invention also discloses a visible mark coding and presenting system which includes said coder and a system which uses said identification video segment to provide content and includes said decoder.

Description

Snake-shaped matrix coder/decoder and visual sign coding and present system
Technical field
The present invention relates to a kind of coding/decoding handles and multimedia signal dispose, more specifically, relate to a kind of encoder and its coding method, a kind of decoder and its coding/decoding method, a kind of visual sign coding and present system and method and a kind of system and method thereof that content is provided by the identification video fragment.
Background technology
Mobile phone of today not only provides function of voice communication, but also the access function to mass data on the internet and service is provided.Integrated along with camera, mobile phone has become the personal images capture device of networking.Along with the raising of image resolution ratio and the enhancing of technical capability, mobile phone can also be carried out how interesting function except taking pictures and photo sent as media information by mobile telephone network.
The theory of " bridge joint physics and digital space " makes user and physical object and the actual object that shows near the electronic curtain the user carry out local interaction.The user of mobile phone carries its mobile phone the most of the time, therefore can use mobile phone in multiple daily life state.So mobile phone is article in the real world and the desirable bridge-set between the related entities in the virtual world.A kind of natural interactive mode is provided thus and under a large amount of situations about using, has strengthened the function of mobile phone.For example, but in the camera mobile phone time spent, anywhere, any time, anyone can be at an easy rate from the street corner the display or the screen picture on the TV of advertisement come retrieval service information.
Consider camera as the mutual existing a large amount of business opportunities of input media of request, adopted by the mutual technology of camera phones support media from the multidigit researcher of company and scientific research institution.Basically, in different media link patterns, exist some that the mutual correlation technique of medium is discussed, for example, to World Wide Web (WWW) TV server, snap into the personal electric calendar to online ticket booking center and from business card from printing placard from the TV program.Existing technology can be divided into two classes: 1) but perceptual model and 2) can not perceptual model.
But perceptual model refers to the form of ID (sign) sign indicating number according to visual bar code is embedded in the media piece.One is exemplified as U.S. Patent No. 6,542, and 933B1 (people such as Durst) wherein discloses a kind of system that id information is encoded to bar code symbol or the readable alphanumeric text strings of people.Another name that is exemplified as the Sony suggestion is called CyberCode, 2D bar code shape symbol (J.Rekimoto and Y.Ayatsuka, " CyberCode:Designing AugmentedReality Environments with Visual Tags ", in Proceedings of DARE2000, pp:1-10, Elsinore, Denmark, in April, 2000).Bar code is a kind of mature technology, and its coding/decoding process is quick and apparent.Yet the enforcement of the bar code of relevant media piece may cause the problem that aesthetic property reduces, and can make the user feel dislike especially, because the user can not obtain any desired information in appearance from bar code.
Can not refer to sign indicating number by perceptual model, hide Info,, still can be detected by machine though this modification almost is that the people is not visible by digital content is carried out trickle modification by digital watermark technology embedding ID.One is exemplified as the United States Patent (USP) of authorizing Rhoads 6,311,214 B1 that proposed by Digimarc.This patent disclosure object that utilize to print embed a plurality of embodiment of many bit ID data, for example clause of mail, books, business card card, packing of product or the like.Yet current digital watermark can not be shifted to video-camera media link pattern.There are some specific reasons known to those of skill in the art.For example, the factor of multiple camera record, for example, and the shake of hand, the affine or misalignment screen of camera, lens aberration and other ambient noise or the like all can cause the serious distortion of the viewdata of video segment.Image to TV screen snap can be subjected to photometry variation (screen reflection, luminous, temporary transient fuzzy, contrast and change in color, mistake focusing or the like), geometric distortion (displacement, convergent-divergent, rotation is sheared, the variation of perspective and block etc.) influence, how to address the above problem for current watermaking system is a kind of stern challenge always.
Above discussed and some relevant technology of video segment identification.Compare with the bar code method, digital watermark is a feasible method of realizing the video segment identification in video-camera or the video-miniature phone.But some characteristics of medium connection mode have constituted challenge to existing digital watermark.Therefore, need a kind of system and method to come by having the handheld computing device identification video fragment of optical pickup.Described method should satisfy following condition: 1) the ID code is embedded in the visual or Audiotex of video segment and stand lossy compression method; 2) concerning common disagreeableness attack video clipping operation, has robustness; 3) be not subjected to the flash ranging in video-camera or video-microphone media link pattern to change geometric distortion and influence of environmental noise; And 4) cause less aesthetic problem and legal issue.
Summary of the invention
Therefore, consider that the problems referred to above propose the present invention.The purpose of this invention is to provide a kind of snake-shaped matrix coder device and its coding method, be used for Bit data is encoded to the snake-shaped matrix with rotational invariance feature.
Another object of the present invention provide a kind of snake-shaped matrix decoder with and coding/decoding method.
Another object of the present invention provides a kind of visual sign coding that comprises the snake-shaped matrix coder device and presents system and method thereof, and a kind ofly content is provided and comprises the system and the method thereof of snake-shaped matrix decoder by the identification video fragment.
According to first aspect present invention, a kind of snake-shaped matrix coder device is provided, comprising: the snake-shaped matrix generating apparatus is used for according to bit sequence { b 0, b 1, b 2... b N2-1The generation bit capacity is N 2The snake-shaped matrix of 2N * 2N, described snake-shaped matrix generating apparatus comprises the centralized positioning unit, is used to utilize four pieces to represent bit b 0, and with four centering rings of orientating snake-shaped matrix as, wherein b 0Be check bit, and four at center is a check block; Form the unit with the 2nd to N ring, utilize per four center symmetry blocks represent a bit and according to the bit-order of bit sequence from the 2nd ring to the N ring along counterclockwise by the ring rotation, wherein the 2nd ring is that centering ring ring and the 2nd to the N bit number that encircles on every side is respectively 3,5,7 ... 2N-1.
According to second aspect present invention, a kind of snake-shaped matrix coder method is provided, comprise that snake-shaped matrix generates step, is used for according to bit sequence { b 0, b 1, b 2... b N2-1The generation bit capacity is N 2The snake-shaped matrix of 2N * 2N, described snake-shaped matrix generates step and comprises: the centralized positioning step, utilize four expression b 0, and with four centering rings of orientating snake-shaped matrix as, wherein b 0Be check bit, and four at center is a check block; Form the unit with the 2nd to N ring, utilize per four center symmetry blocks represent a bit and according to the bit-order of bit sequence from the 2nd ring to the N ring along counterclockwise by the ring rotation, wherein the 2nd ring is that centering ring ring and the 2nd to the N bit number that encircles on every side is respectively 3,5,7 ... 2N-1.
According to third aspect present invention, a kind of snake-shaped matrix decoder is provided, be used for bit sequence { b 0, b 1, b 2... b N2-1Decode, comprising:
First computing unit is used for according to equation (1) calculated threshold θ:
M1＝abs(B1 0+B3 0-B2 0-B4 0)
M2＝abs(B1 0+B2 0-B3 0-B4 0)，(1)
θ = M 1 + M 2 2
Wherein, B1 0, B2 0, B3 0And B4 0Be to be positioned at the snake-shaped matrix center to be used to represent b 0Four, and B1 0, B2 0, B3 0And B4 0It is check block;
Second computing unit is used for calculating M according to equation (2) i:
M i＝abs(B1 i+B3 i-B2 i-B4 i)，(2)
Wherein, B1 i, B2 i, B3 iAnd B4 iBe expression b i(1≤i≤N 2-1) four; And
Comparing unit is with M iCompare with threshold value θ, to obtain b iIf, M wherein iGreater than threshold value θ, then b iEqual 1, if M iSmaller or equal to threshold value θ, then b iEqual 0;
Wherein said second computing unit and comparing unit double counting M iWith with M iθ compares with threshold value, all bits in obtaining bit sequence.
According to fourth aspect present invention, a kind of snake-shaped matrix coding/decoding method is provided, be used for bit sequence { b 0, b 1, b 2... b N2-1Decode, comprising:
First calculation procedure is used for according to equation (1) calculated threshold θ:
M1＝abs(B1 0+B3 0-B2 0-B4 0)
M2＝abs(B1 0+B2 0-B3 0-B4 0)，(1)
θ = M 1 + M 2 2
Wherein, B1 0, B2 0, B3 0And B4 0Be to be positioned at the snake-shaped matrix center to be used to represent b 0Four, and B1 0, B2 0, B3 0And B4 0It is check block;
Second calculation procedure is used for calculating M according to equation (2) i:
M i＝abs(B1 i+B3 i-B2 i-B4 i)，(2)
Wherein, B1 i, B2 i, B3 iAnd B4 iBe expression b i(1≤i≤N 2-1) four; And
Comparison step is used for M iCompare with threshold value θ, to obtain b iIf, M wherein iGreater than threshold value θ, then b iEqual 1, if M iSmaller or equal to threshold value θ, then b iEqual 0;
Repeat second calculation procedure and comparison step, all bits in obtaining bit sequence.
According to fifth aspect present invention, a kind of visual sign coding is provided and has presented system, comprise: present device, with the visual sign coding device, be used for by media channel with present device and be connected, comprise pretreatment unit, the identification code digital coding that is used for the code data of tagging in the future storehouse is bit sequence { b 0, b 1, b 2... b N2-1; The snake-shaped matrix coder device is used for pretreated bit sequence is encoded to snake-shaped matrix; Embed the unit, be used for sequences of code bits is embedded into corresponding visual sign from the flag data storehouse; Sign inserts the unit, is used for visual sign is inserted into each frame of relevant video segments; Communication unit, the video segment that is used for having visual sign send to and present device so that show.
According to sixth aspect present invention, a kind of visual sign coding and rendering method are provided.
According to seventh aspect present invention, a kind of system that is used for providing by the identification video fragment content is provided, comprise: portable terminal, be used for being connected with service centre by network, comprise capturing unit, be used for catching the image of the visual sign with video segment from presenting device, described visual sign has been embedded into the identification code data of having encoded; The sign positioning unit is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching; The snake-shaped matrix decoder is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1; Recovery unit is used for recovering the identification code data from the bit sequence of decoding; Communication unit is used for the identification code data of decoding are sent to service centre; And service centre, be used for identification code data search content data base, so that discern corresponding video segment and provide the content relevant with described video segment to portable terminal according to decoding.
According to eighth aspect present invention, provide a kind of method that is used for providing content by the identification video fragment.
According to ninth aspect present invention, a kind of system that is used for providing by the identification video fragment content is provided, comprise: portable terminal, comprise capturing unit, be used for catching the image of the visual sign with video segment from presenting device, described visual sign has been embedded into the identification code data of having encoded; Communication unit is used to send the captured image to and presents device; Present device, comprise communication unit, be used to receive the image of catching; The sign positioning unit is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching; The snake-shaped matrix decoder is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1; Recovery unit is used for recovering the identification code data from the bit sequence of decoding; Communication unit, be used for will decoding the identification code data with the relevant requests for content of video segment is sent to service centre, and the content of the request that will obtain from service centre sends to portable terminal; And service centre, be used to receive from present device to requests for content, send to from the content-data library lookup content relevant and with described content according to the identification code data of decoding and to present device with the video segment of identification.
According to tenth aspect present invention, provide a kind of method that is used for providing content by the identification video fragment.
The beneficial effect that disclosed the present invention obtains is as follows:
Because the snake-shaped matrix that encoder that proposes and coding method thereof can be encoded to Bit data the characteristics with ring rotation consistency, thereby be applied in the identification code data watermark when this encoder and method thereof, will improve the robustness of watermark.
Comprise the visual sign coding of snake-shaped matrix coder device and present the visual sign that system is used for having encoded and be embedded into vision signal, thereby can come more easily the video segment that will distribute and more interactive system to link by traditional media channel, particularly, by means of the visual sign coding of snake-shaped matrix coder device with present system, the user utilizes portable terminal and its video segment of liking of for example having camera mutual, thereby can obtain more information or the service relevant with its video segment of liking.In addition, different with bar code and pure water seal technology, the present invention proposes a kind of novelty and user-friendly mutual visual sign is connected traditional media with the user.
Because the visual sign coding of snake-shaped matrix coder device and present the identification code data embedded technology that system adopts and be based on the snake-shaped matrix coder method, it for some interference of video-camera link mode (for example, photometry changes, geometric distortion) have a robustness.
In addition, based on Information Hiding Techniques, the present invention can provide the high data capacity that is used to discern a large amount of video segments of benefiting from the snake-shaped matrix coder method.And snake-shaped matrix is embedded in the visual sign, thereby can not produce inaesthetic effect by Steganography.
Description of drawings
By below in conjunction with the description of accompanying drawing to embodiment, these and/or other scheme of the present invention and advantage will become more obvious, and be more readily understood, wherein:
Fig. 1 a shows the block diagram according to snake-shaped matrix coder device of the present invention;
Fig. 1 b-1d is the schematic diagram of the snake-shaped matrix of having encoded;
Fig. 1 e-1f shows the example that 9 Bit datas is encoded to snake-shaped matrix;
Fig. 2 is the flow chart that illustrates according to description of the invention snake-shaped matrix coder method;
Fig. 3 a shows the schematic diagram according to snake-shaped matrix decoder of the present invention;
Fig. 3 b shows the schematic diagram of the process of decoding at 9 Bit datas of having encoded;
Fig. 4 is the flow chart according to description of the invention snake-shaped matrix coding/decoding method;
Fig. 5 is according to visual sign coding of the present invention and the schematic configuration diagram that presents system;
Fig. 6 is the flow chart according to description of the invention visable indicia coding and rendering method;
Fig. 7 is the schematic block diagram that the system of content is provided by the identification video fragment according to an embodiment of the invention;
Fig. 8 is the flow chart that the method for content is provided by the identification video fragment according to an embodiment of the invention;
Fig. 9 is the schematic block diagram that the system of content is provided by the identification video fragment in accordance with another embodiment of the present invention;
Figure 10 is the flow chart that the method for content is provided by the identification video fragment according to an embodiment of the invention;
Figure 11 a shows the example that identification code is inserted into visual sign;
Figure 11 b shows the example of decoding identification code from visual sign.
Embodiment
Now, embodiments of the present invention is described in detail for the general, example of the present invention shown in the drawings, and similar reference number is represented similar element in institute's drawings attached.Below, embodiment is described with reference to the accompanying drawings, so that explain the present invention.
Fig. 1 a shows the block diagram according to snake-shaped matrix coder device of the present invention.With reference to figure 1a, snake-shaped matrix coder device 1 comprises snake-shaped matrix generating apparatus and storage device 14.The Bit data that the snake-shaped matrix generating apparatus is used for having encoded is encoded to snake-shaped matrix, and it comprises that centralized positioning unit 10 and the 2nd to N ring form unit 12.
Fig. 2 is the flow chart that illustrates according to description of the invention snake-shaped matrix coder method.Describe the coding method of snake-shaped matrix in detail below with reference to Fig. 1 a-1c and Fig. 2.This snake-shaped matrix coder method is used for original Bit data is encoded to foursquare snake-shaped matrix.In the cataloged procedure of snake-shaped matrix, per four pieces are used to represent a bit information.Therefore, shown in equation (1), for the square snake-shaped matrix of 2N * 2N, the bit capacity of snake-shaped matrix is N 2:
( 2 N ) * ( 2 N ) 4 = N 2 - - - ( 1 )
Utilizing before the snake-shaped matrix coder device is encoded to snake-shaped matrix with original Bit data, at first utilize known method (for example encrypting error protection, displacement (permutation), BPSK modulation or the like) that original Bit data is encoded to bit sequence { b 0, b 1, b 2... b N2-1, so that carry out the coding of snake-shaped matrix.Bit sequence { b in above-mentioned preliminary treatment generation 0, b 1, b 2... b N2-1In, b 0Be check bit, its value equals 1.Centralized positioning unit 10 utilizes the four expression b as the center of snake-shaped matrix shown in Fig. 1 b 0(S201).Four at described center is check block (that is expression b, 0Four), be used for determining the threshold value of decode procedure Bit data.Next step, the 2nd to N ring forms unit 12 and pursues be provided with described (S202) that encircles according to the bit-order shown in Fig. 1 c according to counter clockwise direction from the center to the outside, bit information of wherein per four expressions.For example, in second ring, 12 pieces are arranged, represent b respectively for per four centrosymmetric 1, b 2, b 3, promptly., b 1, b 2, b 3, b 1, b 2, b 3, b 1, b 2, b 3Correspondingly, outer shroud is represented b (N-1) 2, b (N-1) 2+1..., b N2-2, b N2-1Storable bit number is respectively 1,3,5 in each ring, 7..., and 2N-1 has constituted arithmetic series.
Therefore, bit sequence { b 0, b 1, b 2... b N2-1The snake-shaped matrix and the storage device 14 that are encoded as 2N * 2N store (S203) to it.
The matrix of this center symmetry blocks is called for the former of snake-shaped matrix because the coiling shape of the snake shown in the set-up mode image pattern 1c of Bit data is the same.Clearly, this snake-shaped matrix has the ring rotation consistency, if the identification code data watermark adopts this coding method, then can improve robustness.
Fig. 1 d show when bit length is 9 (, the Bit data sequence shown in Fig. 1 e b0, b1, b2, b3, b4, b5, b6, b7, b8}), the schematic diagram of snake-shaped matrix.Here, N equal 3 and snake-shaped matrix be 6 * 6 block matrix.First bit of bit sequence is a check bit, so four at the center of snake-shaped matrix is a calibration block.Four at the center that has the runic border among Fig. 1 f is a calibration block.The value of snake-shaped matrix for example, is set to: if b iEqual 0, then its four all are set to 1 or 0; If b iBe 1, then four quilts are set to 1,0,1,0 or 0,1,0,1 in proper order.First bit check bit b in the bit sequence 0Be set to 1, so four at center is set to 0,1,0,1.Clearly, four at center also can be set to 1,0,1,0.
Fig. 3 a shows the schematic diagram according to snake-shaped matrix decoder of the present invention.The decode procedure of being carried out by snake-shaped matrix decoder 3 is the inverse process of coding shown in Figure 2.Snake-shaped matrix coder device 3 comprises first computing unit, 30, the second computing units 32 and comparing unit 34.First computing unit 30 is used for calculated threshold.Second computing unit 32 and comparing unit 34 are cooperated together and are used for by using described threshold value to calculate each b from the Bit data sequence i
Fig. 4 is the flow chart according to description of the invention snake-shaped matrix coding/decoding method.Coding/decoding method also is the inverse process of coding method shown in Figure 2.In order clearly to describe described coding/decoding method, be that example is described with 3 * 3 snake-shaped matrixes shown in Fig. 1 f, the length of the original bit data of wherein having encoded is 9.At S401, first computing unit 30 reads B1 0, B2 0, B3 0, B4 0Value and according to equation (2) calculated threshold θ:
M1＝abs(B1 0+B3 0-B2 0-B4 0)
M2＝abs(B1 0+B2 0-B3 0-B4 0) (2)
θ = M 1 + M 2 2
B1 wherein 0, B2 0, B3 0, B4 0Be the expression check bit b shown in Fig. 1 f 0Four pieces that are provided with counterclockwise.
At S402, second computing unit 32 calculates M according to equation (3) i:
M i＝abs(B1 i+B3 i-B2 i-B4 i) (3)
B1 wherein i, B2 i, B3 i, B4 iBe presentation graphs 1f bit b i(1≤i≤N 2-1) four that be provided with counterclockwise, centrosymmetric four.
Afterwards, at S403, computing unit 34 according to equation (4) with M iCompare with θ, to obtain b according to equation (4) i:
b i = 1 if M i > θ 0 if M i ≤ θ - - - ( 4 )
At S404, second computing unit 32 and comparing unit 34 are cooperated according to equation (3) and equation (4) jointly so that calculate each b in the Bit data sequence iTherefore, by calculating M iAnd with M iCompare all bit b that obtain in the Bit data sequence by bit with threshold value θ 0, b 1, b 2... b 8Thereby snake-shaped matrix be decoded as Bit data sequence shown in Fig. 1 e 1,0,0,0,0,0,1,1,0}.And the Bit data sequence of being obtained can be reverted to original Bit data by known method, and for example, deciphering BPSK demodulation etc.
Described above snake-shaped matrix coder device and decoder.Because the snake-shaped matrix coder device is encoded to the snake-shaped matrix of the characteristics with ring rotation consistency with bit sequence, thereby when this encoder was used in the digital watermarking field, for example the identification code data watermark will improve robustness.And the identification code data behind the coding can be embedded in visable indicia or the sign.In addition, snake-shaped matrix coder device and decoder also can be applied to be used for realizing in 2D bar code and the encryption.
Described snake-shaped matrix coder device and decoder are described in the digital watermarking Application for Field referring now to Fig. 5-10.
Fig. 5 is the schematic configuration diagram that comprises the visual sign coding of snake-shaped matrix coder device and present system according to of the present invention.With reference to figure 5, visual sign coding and present system and comprise visual sign coding device 5, media channel 56 and present device 57.Media channel for example is the TV broadcast system.Presenting device 57 for example is television set or ad distribution machine.
Visual sign coding device 5 comprises database of identifier codes 51, snake-shaped matrix coder device 1, and identification code data pretreatment unit 58, flag data storehouse 52 embeds unit 53, and sign inserts unit 54 and communication unit 55.Because the structure and the coding method thereof of snake-shaped matrix coder device 1 are described in Fig. 1 and Fig. 2, omit the description to it here.Database of identifier codes 51 stores a large amount of sign (ID) code data, and identification code is relevant with video segment, is used to help the classification of identification video fragment.Construct according to one group of visual sign in flag data storehouse 52.Visual sign is corresponding with any one significant graphic symbol, for example, and trade mark, product card mark, push button label, TV program symbol, product/company identifier, or any specific custom icon.It is new bit sequence { b with the identification code digital coding in the database of identifier codes that identification code data pretreatment unit 58 at first utilizes known method 0, b 1, b 2... b N2-1, for example encrypt error protection, displacement, BPSK modulation or the like.Afterwards, snake-shaped matrix coder device 1 is encoded to snake-shaped matrix with this bit sequence.Embedding unit 53 is embedded into the identification code data of encoding in the corresponding visual sign.The visual sign that sign will insert after will encoding in unit 54 is inserted in the corner of each frame of video segment.After this, the video segment with this visual sign sends to by media channel 56 and presents device 57 so that show.Video segment for example is that product advertising is shown, news report, a series of images of preview or TV program browsing or the like.
Fig. 6 is the flow chart according to description of the invention visable indicia coding and rendering method.With reference to figure 6, at S601, identification code data pretreatment unit 58 at first utilizes known method that the identification code digital coding in the database of identifier codes 51 is bit sequence { b 0, b 1, b 2... b N2-1.Afterwards, at S602, snake-shaped matrix coder device 1 is encoded to snake-shaped matrix with bit sequence.At S603, embed unit 53 the identification code data of encoding are embedded in the corresponding visual sign.Particularly, embed unit 53 and from flag data storehouse 52, select visual sign, for example square NEC mark (Logo), and extract channel, for example a blue color planes of logos.Then, the plane is broken down into a plurality of tile fragments (tiling blocks), by embedding unit 53 each piece (that is, the piece of the identification code data that expression has been encoded) of snake-shaped matrix is embedded into the corresponding position in the logos, shown in Figure 11 a.Though the piece of snake-shaped matrix can not be embedded into to perception in the spatial domain (for example, blue channel), for a person skilled in the art, described can not can also be embedded into to perception in the transform domain (for example Fourier or wavelet transformed domain).
At S604, sign inserts the visual sign that will encode unit 54 and is inserted in the corner of corresponding each frame of video segment, and wherein the identification code Information hiding is in the visual sign of having encoded.After this, at S605, the video segment that communication unit will have a visual sign by media channel 56 (for example, TV broadcast system) sends to and presents device 57.And present the video segment that device 57 demonstrations have visual sign, thereby the user can take pictures to its video segment of liking.
Fig. 7 is the schematic block diagram that the system of content is provided by the identification video fragment according to an embodiment of the invention.
With reference to figure 7, described system comprises portable terminal 7, network 79, service centre 78.Described system has used snake-shaped matrix decoder 3 that the identification code data that are hidden in the visual sign are decoded, and identifies video segment by the identification code of decoding.Therefore, can provide the content that comprise information or service relevant to portable terminal with video segment.Because the structure and the coding/decoding method thereof of snake-shaped matrix decoder 3 are described in Fig. 3 a and Fig. 4, omit the description to it here.
Portable terminal 7 for example comprises mobile phone, PDA (personal digital assistant), computer, hand-held amusement equipment and set-top box, and each all is equipped with optical reader.Digital camera for example, World Wide Web (WWW) CAM, CCD, or cmos imaging scanner.
Service centre 78 can comprise that various interactive systems (for example, product information platform, ecommerce worldwide website, World Wide Web (WWW) TV service provider and online ticket booking center or the like) go up with information or serve relevant content.Because the identification code data before the coding are relevant with corresponding video segment respectively, after obtaining decoded identification code data, classification that can the identification video fragment.Therefore, the content that comprises information relevant with video segment or service can be provided for portable terminal 7.
Portable terminal 7 comprises user interface 70, display unit 71, capturing unit 73, sign positioning unit 74, snake-shaped matrix decoder 3, recovery unit 72, processor 76, bus 77, memory cell and communication unit (not shown).Portable terminal 7 receives user's input by user interface 70.The operating system that cell stores is carried out on processor 76.Communication unit has adopted multiple communication means, relate to infrared, bluetooth, WLAN, GSM, even 3G.When having shown different video segments on presenting device 57, the user can use the capturing unit 73 (for example, camera) of its portable terminal 7 to catch the visual sign of the video segment that he likes.Afterwards, 74 pairs of signs of sign positioning unit are located, and extract bit sequence { b by decoder 3 0, b 1, b 2... b N2-1.Recovery unit 72 is carried out the operation (for example, deciphering, BPSK rectification or the like) opposite with identification code data pretreatment unit 58 so that acquisition identification code data.Portable terminal through network 79 (for example communication network or internet) by communication unit with the identification code data of decoding send to service centre 78.Therefore, the identification code data of decoding of the classification of identification video fragment have been obtained to help.
Service centre 78 comprises content data base 781 and search unit 782.Because decoded identification code data are corresponding to information relevant with video segment or service, wherein said video segment has embedded visual sign, and service centre 78 is according to identification code data search information or the service relevant with video segment that receives.Afterwards, information or service are sent to portable terminal 7.The display unit 71 of portable terminal 7 shows described information or service.For example, the video segment of demonstration shows the novel mobile telephone of NEC.After portable terminal 7 has been caught the NEC sign and the identification code data of decoding are sent to service centre 78, will on portable terminal 7, show the more detailed information of the novel mobile telephone of relevant NEC.That is to say, more useful informations of relevant specific NEC product can be provided to the user by service centre 78.
Fig. 8 shows the flow chart that the method for content is provided by the identification video fragment according to an embodiment of the invention.At S801, capturing unit 73 is caught the image of the coding maker that comprises video segment according to the user command that receives by user interface 70 from presenting device 57.Usually, the sign of catching in the image has some photometry variation and geometric distortions.Therefore, by portable terminal 7 at the S802 witness marker.The sign positioning unit 74 of portable terminal 7 at first detects and extracts the edge of image structure of catching.Had multiple edge detection method for the person of ordinary skill of the art, present embodiment also can adopt any edge detection method.These methods comprise Canny operator and Laplacian.Afterwards, the sign positioning unit 74 of portable terminal 7 uses four corner locations at the edge of catching sign that detects to come distortion (warping) parameter of calculation flag.Described deformation parameter is used for irregular quadrangle is transformed to the square of rule,, sign is carried out normalization that is, thereby can obtain the sign of regularization from the distortion of sign by pixel ground.Afterwards, at S803, the decoder 3 of portable terminal 7 decodes bit sequence { b according to the definition of snake-shaped matrix from the sign of regularization 0, b 1, b 2... b N2-1.In decode procedure, the decoder of portable terminal is according to equation (2), and decode to snake-shaped matrix (3) and (4).Fig. 3 b has provided an example of decoding at 9 Bit datas of having encoded.At S804, recovery unit 72 is by carrying out the operation (for example decode BPSK rectification or the like) opposite with identification code data pretreatment unit 58 from bit sequence { b 0, b 1, b 2... b N2-1In recover original identification code data.Figure 11 b shows the schematic diagram of normalized and decoding processing.Therefore, decoded identification code data send to service centre 78 by communication unit by network 79.Because the identification code data before the coding are relevant with corresponding video segment respectively, after the identification code data that obtain decoding, classification that can the identification video fragment, and therefore can provide information or the service relevant to portable terminal 7 with described video segment.At S806, when service centre 78 receives the identification code sequence, by search unit 782 searching for content data storehouses 781 so that find and video segment relevant service or the information corresponding with the identification code data.At S807, service centre 78 sends the information that retrieves or service so that show to portable terminal 7.
Fig. 9 is the schematic block diagram that the system of content is provided by the identification video fragment in accordance with another embodiment of the present invention.Difference between Fig. 7 and Fig. 9 is: sign positioning unit and snake-shaped matrix decoder one coexist to present on the device 57 and work.
In Fig. 9, portable terminal 7 comprises: user interface 70, display unit 71, capturing unit 73, processor 76, bus 77, memory cell and communication unit (not shown).Communication unit has adopted multiple communication means, relate to infrared, bluetooth, WLAN, GSM, even 3G.When having shown different video segments on presenting device 57, the user can use the capturing unit 73 of its portable terminal 7 to come screen is taken snapshot.Afterwards, communication unit connects snapshot image that (that is, bluetooth, 802.11 or the like) will have the sign of coding by local network and sends to and present device 57.
Present device 57 and comprise communication unit 570, display unit 572, sign positioning unit 74, snake-shaped matrix decoder 3, recovery unit 575, bus 573 and memory cell (not shown).Because the structure and the coding/decoding method thereof of snake-shaped matrix decoder 3 are described in Fig. 3 a and Fig. 4, omit the description to it here.When presenting device 57 and receive the snapshot image of the sign with coding, thereby the sign that presents the positioning unit 74 location decodings of device 57 recovers square snake-shaped matrix.Correspondingly, decoder decodes bit sequence { b from the sign behind the location 0, b 1, b 2... b N2-1.Recovery unit 575 is by carrying out the operation (for example decode BPSK rectification or the like) opposite with identification code data pretreatment unit 58 from bit sequence { b 0, b 1, b 2... b N2-1In recover original identification code data.Afterwards, by network 79 (that is, internet or telecommunications network) with the identification code data of decoding with the requests for content relevant with video segment sent to together in the service 78.Because the user's interest video segment is known by the identification code sequence service centre 78 according to decoding, thus search more service information and the content of request sent to and present device 57.At last, give customer mobile terminal 7 by the communication unit 570 of timer 57 with information or service feedback.A benefit of described system is not need portable terminal is carried out special change, because sign positioning unit and decoder are operated in presents on the device.Compare with the system of Fig. 7, this variation is more general, because any communication unit (that is local network port) and portable terminal of the unit of taking pictures of being equipped with may be used to described system.
Figure 10 is the flow chart that the method for content is provided by the identification video fragment according to an embodiment of the invention.
At S1001, capturing unit 73 is caught the image of the coding maker that comprises video segment according to the user command that receives by user interface 70 from presenting device 57.Afterwards, at S1002, the communication unit of image by portable terminal 7 of catching that will comprise the sign of coding sends to and presents device 57.At S1003, position by 74 pairs of signs of the sign positioning unit that presents device 57.The sign positioning unit 74 of timer 57 at first detects the edge of image structure of catching.Afterwards, establishment positioning unit 74 uses the corner location at the edge that detects to come the deformation parameter of calculation flag.Described deformation parameter is used for irregular quadrangle is transformed to the square of rule,, sign is carried out normalization that is, thereby can obtain the sign of regularization from the distortion of sign by pixel ground.Therefore, at S1004, the decoder 3 that presents device 57 decodes bit sequence { b according to the definition of snake-shaped matrix from the sign of regularization 0, b 1, b 2... b N2-1.In decode procedure, the decoder 3 that presents device 57 is according to equation (2), and decode to snake-shaped matrix (3) and (4).Figure 11 b shows normalized and decoding processing.At S1005, the recovery unit 72 that presents device 57 is from bit sequence { b 0, b 1, b 2... b N2-1In recover original identification code data.At S1006, by the communication unit 570 that presents device 57 by network 79 with the identification code data of decoding with to sending to service centre 78 with the request of the relevant information of identification code sequence of decoding.When service centre receives these identification code data and described request, according to the identification code data content data base 781 is retrieved by search unit 782.At last, at S1007, service centre 78 sends information or the service that retrieves to presenting device 57, and therefore, presenting device 57 can send to portable terminal 7 so that show with described information or service by local area network (LAN).
Although illustrated and described the present invention, what it will be appreciated by those skilled in the art that is, under the prerequisite that does not depart from principle of the present invention and spirit, can make amendment to present embodiment, and scope of the present invention is limited by claims and equivalent thereof.

Claims (40)

1. snake-shaped matrix coder device comprises:
The snake-shaped matrix generating apparatus is used for according to bit sequence { b 0, b 1, b 2... b N2-1The generation bit capacity is N 2The snake-shaped matrix of 2N * 2N, described snake-shaped matrix generating apparatus comprises
The centralized positioning unit is used to utilize four pieces to represent bit b 0, and with four centering rings of orientating snake-shaped matrix as, wherein b 0Be check bit, and four at center is a check block; With
The the 2nd to N ring forms the unit, utilize per four center symmetry blocks represent a bit and according to the bit-order of bit sequence from the 2nd ring to the N ring along counterclockwise by the ring rotation, wherein the 2nd ring is that centering ring ring and the 2nd to the N bit number that encircles on every side is respectively 3,5,7 ... 2N-1.
2. encoder as claimed in claim 1 is wherein by carrying out preliminary treatment to obtain described bit sequence { b to the original bit data that will be encoded 0, b 1, b 2... b N2-1.
3. encoder as claimed in claim 1 is wherein represented b 0Four be set to 1,0,1,0 or 0,1,0,1 respectively.
4. encoder as claimed in claim 1 is wherein worked as b iEqual at 1 o'clock, expression b iFour be expressed as 1,0,1,0 or 0,1,0,1 in order; And work as b iEqual at 0 o'clock, expression b iFour all be 0 or 1.
5. snake-shaped matrix coder method comprises:
Snake-shaped matrix generates step, is used for according to bit sequence { b 0, b 1, b 2... b N2-1The generation bit capacity is N 2The snake-shaped matrix of 2N * 2N, described snake-shaped matrix generates step and comprises
The centralized positioning step is utilized four expression b 0, and with four centering rings of orientating snake-shaped matrix as, wherein b 0Be check bit, and four at center is a check block; With
The the 2nd to N ring forms the unit, utilize per four center symmetry blocks represent a bit and according to the bit-order of bit sequence from the 2nd ring to the N ring along counterclockwise by the ring rotation, wherein the 2nd ring is that centering ring ring and the 2nd to the N bit number that encircles on every side is respectively 3,5,7 ... 2N-1.
6. coding method as claimed in claim 5 is wherein by carrying out preliminary treatment to obtain described bit sequence { b to the original bit data that will be encoded 0, b 1, b 2... b N2-1.
7. b is wherein represented in coding method as claimed in claim 5 0Four be set to 1,0,1,0 or 0,1,0,1 respectively.
8. b is wherein worked as in coding method as claimed in claim 5 iEqual at 1 o'clock, expression b iFour be expressed as 1,0,1,0 or 0,1,0,1 in order; And work as b iEqual at 0 o'clock, expression b iFour all be 0 or 1.
9. a snake-shaped matrix decoder is used for bit sequence { b 0, b 1, b 2... b N1-1) decode, comprising:
First computing unit is used for according to equation (1) calculated threshold θ:
M1＝abs(B1 0+B3 0-B2 0-B4 0)
M2＝abs(B1 0+B2 0-B3 0-B4 0)，(1)
θ = M 1 + M 2 2
Wherein, B1 0, B2 0, B3 0And B4 0Be to be positioned at the snake-shaped matrix center to be used to represent b 0Four, and B1 0, B2 0, B3 0And B4 0It is check block;
Second computing unit is used for calculating M according to equation (2) i:
M i＝abs(B1 i+B3 i-B2 i-B4 i)，(2)
Wherein, B1 i, B2 i, B3 iAnd B4 iBe expression b i(1≤i≤N 2-1) four; And
Comparing unit is with M iCompare with threshold value θ, to obtain b iIf, M wherein iGreater than threshold value θ, then b iEqual 1, if M iSmaller or equal to threshold value θ, then b iEqual 0;
Wherein said second computing unit and comparing unit double counting M iWith with M iθ compares with threshold value, all bits in obtaining bit sequence.
10. a snake-shaped matrix coding/decoding method is used for bit sequence { b 0, b 1, b 2... b N2-1) decode, comprising:
First calculation procedure is used for according to equation (1) calculated threshold θ:
M1＝abs(B1 0+B3 0-B2 0-B4 0)
M2＝abs(B1 0+B2 0-B3 0-B4 0)，(1)
θ = M 1 + M 2 2
Wherein, B1 0, B2 0, B3 0And B4 0Be to be positioned at the snake-shaped matrix center to be used to represent b 0Four, and B1 0, B2 0, B3 0And B4 0It is check block;
Second calculation procedure is used for calculating M according to equation (2) i:
M i＝abs(B1 i+B3 i-B2 i-B4 i)，(2)
Wherein, B1 i, B2 i, B3 iAnd B4 iBe expression b i(1≤i≤N 2-1) four; And
Comparison step is used for M iCompare with threshold value θ, to obtain b iIf, M wherein iGreater than threshold value θ, then b iEqual 1, if M iSmaller or equal to threshold value θ, then b iEqual 0;
Repeat second calculation procedure and comparison step, all bits in obtaining bit sequence.
11. a visual sign coding and present system comprises:
Present device and
The visual sign coding device, be used for by media channel with present device and be connected, comprise
Pretreatment unit, the identification code digital coding that is used for the code data of tagging in the future storehouse is bit sequence { b 0, b 1, b 2... b N2-1;
The snake-shaped matrix coder device is used for pretreated bit sequence is encoded to snake-shaped matrix;
Embed the unit, be used for sequences of code bits is embedded into corresponding visual sign from the flag data storehouse;
Sign inserts the unit, is used for visual sign is inserted into each frame of relevant video segments;
Communication unit, the video segment that is used for having visual sign send to and present device so that show.
12. as the system of claim 11, the bit sequence that will encode in wherein said embedding unit is embedded in the spatial domain of visual sign.
13. as the system of claim 11, the bit sequence that will encode in wherein said embedding unit is embedded in the transform domain of visual sign.
14. as the system of claim 11, wherein said visual sign is embedded in the corner location of each frame of video segment.
15. as the system of claim 11, wherein said visual sign is graphic symbol or custom icon.
16. visual sign coding and rendering method comprise step:
From database of identifier codes, read the identification code data and
With the identification code digital coding is bit sequence { b 0, b 1, b 2... b N2-1;
Bit sequence after will being encoded by the snake-shaped matrix coder device is encoded to snake-shaped matrix;
Sequences of code bits is embedded in the corresponding visual sign from the flag data storehouse;
Visual sign is inserted in each frame of relevant video segments;
The video segment that will have visual sign sends to and presents device;
Show the video segment that has visual sign.
17. as the method for claim 16, wherein said embedding step comprises that the bit sequence of having encoded is embedded into the step in the spatial domain of visual sign.
18. as the method for claim 16, wherein said embedding step comprises that the bit sequence of having encoded is embedded into the step in the transform domain of visual sign.
19. as the method for claim 16, wherein said visual sign is embedded in the corner location of each frame of video segment.
20. as the method for claim 16, wherein said visual sign is graphic symbol or custom icon.
21. a system that is used for providing by the identification video fragment content comprises:
Portable terminal is used for being connected with service centre by network, comprises
Capturing unit is used for catching the image of the visual sign with video segment from presenting device, and described visual sign has been embedded into the identification code data of having encoded;
The sign positioning unit is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching;
The snake-shaped matrix decoder is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1;
Recovery unit is used for recovering the identification code data from the bit sequence of decoding;
Communication unit is used for the identification code data of decoding are sent to service centre; With
Service centre is used for the identification code data search content data base according to decoding, so that discern corresponding video segment and provide the content relevant with described video segment to portable terminal.
22. system as claimed in claim 21, wherein said capturing unit is an optical reader.
23. the system as claimed in claim 22, wherein said optical reader is a digital camera.
24. system as claimed in claim 21, wherein said portable terminal comprises one of mobile phone, PDA, computer, hand-held amusement equipment and set-top box at least.
25. system as claimed in claim 21, thereby wherein said sign positioning unit carries out the square snake-shaped matrix that normalization is transformed to described visual sign rule by the deformation parameter that calculates visual sign to visual sign.
26. a method that is used for providing by the identification video fragment content comprises:
Catch step, be used for catching the image of the visual sign that has video segment by portable terminal from presenting device, described visual sign has been embedded into the identification code data of having encoded;
The sign positioning step is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching;
The snake-shaped matrix decoding step is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1;
Recovering step is used for recovering original identification code data from the bit sequence of decoding;
Forwarding step is used for the identification code data of decoding are sent to service centre;
Finding step is by the identification code data search content data base of described service centre according to decoding, so that discern corresponding video segment and provide the content relevant with described video segment to portable terminal.
27. method as claimed in claim 26, the wherein said step of catching is carried out by optical reader.
28. method as claimed in claim 27, wherein said optical reader is a digital camera.
29. method as claimed in claim 26, wherein said portable terminal comprise one of mobile phone, PDA, computer, hand-held amusement equipment and set-top box at least.
30. method as claimed in claim 26, thereby wherein said sign positioning step carries out the square snake-shaped matrix that normalization is transformed to described visual sign rule by the deformation parameter that calculates visual sign to visual sign.
31. a system that is used for providing by the identification video fragment content comprises: portable terminal comprises
Capturing unit is used for catching the image of the visual sign with video segment from presenting device, and described visual sign has been embedded into the identification code data of having encoded;
Communication unit is used to send the captured image to and presents device;
Present device, comprise
Communication unit is used to receive the image of catching;
The sign positioning unit is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching;
The snake-shaped matrix decoder is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1;
Recovery unit is used for recovering the identification code data from the bit sequence of decoding;
Communication unit, be used for will decoding the identification code data with the relevant requests for content of video segment is sent to service centre, and the content of the request that will obtain from service centre sends to portable terminal;
With
Service centre, be used to receive from present device to requests for content, send to from the content-data library lookup content relevant and with described content according to the identification code data of decoding and to present device with the video segment of identification.
32. system as claimed in claim 31, wherein said capturing unit is an optical reader.
33. system as claimed in claim 32, wherein said optical reader is a digital camera.
34. system as claimed in claim 31, wherein said portable terminal comprises one of mobile phone, PDA, computer, hand-held amusement equipment and set-top box at least.
35. system as claimed in claim 31, thereby wherein said sign positioning unit carries out the square snake-shaped matrix that normalization is transformed to described visual sign rule by the deformation parameter that calculates visual sign to visual sign.
36. a method that is used for providing by the identification video fragment content comprises:
Catch step, be used for catching the image of the visual sign with video segment from presenting device, described visual sign has been embedded into the identification code data of having encoded;
Send the captured image to the step that presents device;
The step of the image that reception is caught;
The sign positioning step is used for extracting the edge of visual sign and visual sign being normalized to regular square snake-shaped matrix from the image of catching;
The snake-shaped matrix decoding step is used for decoding bit sequence { b from normalized visual sign 0, b 1, b 2... b N2-1;
Recovering step is used for recovering original identification code data from the bit sequence of decoding;
Transfer step, by present device with the decoding the identification code data with the requests for content relevant with video segment sent to service centre;
Search step, by service centre according to the decoding the identification code data from the content-data library lookup content relevant with corresponding video segment;
The content of being asked is sent to the step of portable terminal.
37. method as claimed in claim 36, the wherein said step of catching is carried out by optical reader.
38. method as claimed in claim 37, wherein said optical reader is a digital camera.
39. method as claimed in claim 36, wherein said portable terminal comprise one of mobile phone, PDA, computer, hand-held amusement equipment and set-top box at least.
40. method as claimed in claim 36, thereby wherein said sign positioning unit carries out the square snake-shaped matrix that normalization is transformed to described visual sign rule by the deformation parameter that calculates visual sign to visual sign.
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