WO2006025382A1 - Dispositif et méthode de multiplexage d’informations, dispositif et méthode d’extraction d’informations et programme informatique - Google Patents

Dispositif et méthode de multiplexage d’informations, dispositif et méthode d’extraction d’informations et programme informatique Download PDF

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Publication number
WO2006025382A1
WO2006025382A1 PCT/JP2005/015760 JP2005015760W WO2006025382A1 WO 2006025382 A1 WO2006025382 A1 WO 2006025382A1 JP 2005015760 W JP2005015760 W JP 2005015760W WO 2006025382 A1 WO2006025382 A1 WO 2006025382A1
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Prior art keywords
information
signal
video signal
unique information
unit
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PCT/JP2005/015760
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English (en)
Japanese (ja)
Inventor
Kazuo Kuroda
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Pioneer Corporation
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Priority to JP2006532718A priority Critical patent/JPWO2006025382A1/ja
Publication of WO2006025382A1 publication Critical patent/WO2006025382A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division

Definitions

  • the present invention relates to an information multiplexing device and method for multiplexing unique information such as copyright information, for example, information such as a video signal, an information extracting device and method for extracting the unique information, and
  • the present invention relates to the technical field of computer programs executed in these information multiplexing devices and information extraction devices.
  • FIG. 16 is a schematic diagram schematically showing a process of embedding a digital watermark as a general example.
  • the multiplier 50 multiplies the unique information 20 such as the copyright information embedded as the electronic permeability by the gain coefficient k.
  • the lower 2 bits of the luminance information are used to embed the unique information 20 in the 8-bit luminance information.
  • the lower 2 bits can identify four types of information: “00”, “01”, “10”, and “11”, but the information of “00” and information other than “00” By identifying, it becomes possible to embed unique information.
  • the unique information 20 is extracted from the image 53 in which the electronic transparency is embedded as described above, for example, when the unique information 20 is embedded as a digital watermark by, for example, a bit plane embedding method, It is possible to extract the unique information 20 by extracting the bit value of the bit plane value in which the digital watermark is embedded from the luminance information or the color information, and then dividing the extracted data by the gain coefficient k.
  • the present invention has been made in view of, for example, the above-described problems, and can uniquely and accurately multiplex original information such as copyright information with information such as a video signal, for example. It is an object of the present invention to provide an information multiplexing apparatus and method, and a computer program.
  • the information multiplexing apparatus of the present invention is an information multiplexing apparatus that superimposes unique information on a video signal input in a predetermined cycle unit (“second Z frame” or “second Z field”).
  • a video signal, unique information such as copyright information and power are input to the information multiplexing apparatus.
  • the video signal input to the information multiplexing device may be an analog video signal or a digital video signal.
  • the generation means generates an information signal carrying unique information.
  • the superimposing means converts the information signal into a predetermined DC component value (DC component value, average DC value) indicating an average value of luminance signals for each predetermined cycle unit included in the video signal.
  • predetermined cycle unit is an example of the display method of the display It may be a period unit based on 1Z60 seconds, which is the NTSC field period, or may be a period unit based on 1Z30 seconds, which is a frame period. It may be.
  • the superimposing means may be configured to superimpose one data unit of the information signal in a unit time larger than 10 times a predetermined cycle unit (“second Z frame” or “second Z field”). Alternatively, the superimposing means superimposes one data unit of the information signal in a unit time larger than 10 times the least common multiple of the cycle time of the original video signal and the cycle time of the video signal expected to be copied. You may comprise as follows.
  • unique information is embedded as electronic transparency in a pixel at a predetermined position of one original image.
  • the original image is enlarged, reduced, rotated, Or, if processing such as recompression is performed, the original information may not be extracted.
  • digital watermarking original information is lost when illegal copying is performed by a camcorder in a so-called cinematographic attack.
  • unique information embedded in one original image is extracted, so basically it is necessary to extract the luminance information of all pixels constituting the original image. Therefore, the processing is overloaded.
  • the direct current component value (DC component value, average DC value) indicating the average value of the luminance signal for each predetermined cycle unit included in the video signal is, for example, a predetermined value. Since information signals such as the amount of change are superimposed, original information may be lost even when processing such as enlargement, reduction, rotation, or recompression of the screen included in the video signal is performed. It can be said that there is little or no sex. In addition, since it is sufficient to extract the DC component value of the screen, calculation is particularly difficult in a compression method in which each reference pixel block such as DCT described later is configured based on the DC component value. Also, the load on the software processing on the computer is reduced. Furthermore, it is possible to detect superimposed data even when copying with a camcorder at the screening hall.
  • unique information such as copyright information can be easily and accurately multiplexed with information such as a video signal.
  • the predetermined cycle unit is a frame or field cycle unit of the video signal.
  • the generation unit generates an offset value for giving a predetermined change amount to the DC component value as the information signal by being superimposed, and the superimposition The means superimposes the offset value on the DC component value based on the predetermined period unit.
  • the image information included in the video signal that is, the offset value for carrying the unique information is made variable according to a predetermined position on one screen so that the average DC value (DC component value, DC component value) is equal.
  • the screen area the pixel brightness information or the bit value of the color value changes in a short time, so that the offset value for carrying unique information is increased.
  • V may be configured to reduce the offset value for carrying unique information in a screen area where the luminance information of the pixel or the bit value of the color value has not changed for a long time! .
  • the generating means generates spread spectrum data obtained by performing spread spectrum on the unique information as the information signal.
  • the generating means generates a single sine wave signal based on the predetermined cycle unit as the information signal (“1”) or Not generated (“ ⁇ ”).
  • the generation unit generates a sine wave signal that is phase-modulated with reference to the predetermined cycle unit as the information signal.
  • the generating unit generates a sine wave signal that is frequency-modulated with reference to the predetermined cycle unit as the information signal.
  • the generating means generates a first sine wave signal and a second sine wave signal based on the predetermined cycle unit as the information signal.
  • the unique information is indicated based on a phase difference between the first sine wave signal and the second sine wave signal.
  • the frequency of the second sine wave signal may be configured to be, for example, twice or 10 times the frequency of the first sine wave signal.
  • the copy control information described later is Copy Free, that is, when the unique information is “00”, a predetermined phase difference is used. If the first and second sine wave signals are superimposed with a filter, the removal process by the filter etc. becomes difficult. Therefore, it is very effective for copyright protection of video signals.
  • Another aspect of the information multiplexing device of the present invention is included in a group of video signal frames defined by a first sequence (odd number) among a plurality of video signal frames input in a predetermined cycle unit.
  • detecting means for detecting a first average value of DC component values, wherein the generating means outputs the first average value by a predetermined amount (“0”: ⁇ 2, “1”: +2) as the information signal.
  • the first information is added to or subtracted from, and the superimposing means calculates a DC component value included in another group of video signal frames defined by a second sequence (even number) of the plurality of video signal frames.
  • the information signal is superimposed by substituting the first information.
  • various processes by the generation unit and the superimposition unit can be performed more accurately and easily.
  • the average value of the DC component values of the luminance signals of two odd frames is used as the reference value of the DC component value of the luminance signal of the even frame existing between the two odd frames, and a predetermined offset amount is added to the reference value.
  • the original information may be superposed by adding or subtracting.
  • DCT digital method described later You may employ
  • the superimposing means divides the information signal by discretely substituting the first component for the DC component value included in the video signal frame of the other group. Configure it like this.
  • the generation means is configured to generate the information signal while changing the attribute of the information signal at a fixed-length time interval or a variable-length time interval. May be.
  • the unique information carried in the information signal is copyright information.
  • the unique information carried in the information signal is copy control information (CCI: Copy Control Information: 2 bits).
  • the unique information carried in the information signal is a region code (8 bits) indicating regional information.
  • the present invention can be applied to a recording medium such as a DVD.
  • the information multiplexing method of the present invention provides information in an information multiplexing apparatus that superimposes unique information on a video signal input in a predetermined cycle unit (“second Z frame” or “second Z field”). It is a multiplexing method, a generating step for generating an information signal carrying the unique information, and the generated information signal for the predetermined frequency included in the video signal. And a superimposing step of superimposing the direct current component value indicating the average value of the luminance signal for each period on the basis of the predetermined period unit.
  • the information multiplexing method according to the present invention can also adopt various aspects.
  • the information extraction apparatus of the present invention obtains the unique information from the video signal in which the unique information is multiplexed by the information multiplexing apparatus of the present invention described above (including various aspects thereof).
  • An information extraction device that extracts in units of the predetermined period (“second Z frame” or “second Z field”), a detection means for detecting the information signal carrying the unique information, and the detected information Extraction means for extracting the unique information from the signal based on the predetermined period unit.
  • the detection means decompresses and decodes the encoded video signal recorded in the bit stream or file, for example. To detect.
  • the superimposed unique information is extracted from, for example, the decoded and detected video signal by the superimposing means. Then, for example, it is displayed on a monitor together with a video signal or recorded on a recording medium. Therefore, various kinds of processing by the detection means and the extraction means can be performed more accurately and easily.
  • the information extraction apparatus of the present invention can also adopt various aspects.
  • the information extraction method of the present invention extracts the unique information from a video signal in which the unique information is multiplexed by the information multiplexing device of the present invention described above (including various aspects thereof).
  • An information extraction method in an information extraction apparatus that extracts in units of the predetermined period (“second Z frame” or “second Z field”), the detection step detecting an information signal carrying the unique information, and the detection An extraction step of extracting the unique information from the information signal based on the predetermined cycle unit.
  • the information extraction method according to the present invention can also adopt various aspects.
  • a first computer program according to the present invention causes a computer to function as at least a part of the above-described information multiplexing apparatus (including various forms thereof).
  • a second computer program according to the present invention causes a computer to function as at least a part of the above-described information extraction device (including various forms thereof).
  • each computer program if the computer program is read from a recording medium such as a ROM, CD-ROM, DVD-ROM, or hard disk storing the computer program and then executed by the computer.
  • a recording medium such as a ROM, CD-ROM, DVD-ROM, or hard disk storing the computer program and then executed by the computer.
  • the computer program is downloaded to a computer via communication means and then executed, the above-described information multiplexing device or information extraction device of the present invention can be realized relatively easily.
  • each computer program of the present invention can also adopt various aspects.
  • the first computer program product in the computer-readable medium clearly embodies a program instruction executable by a computer, and the computer is connected to the information multiplexing device (described above). However, it also functions as at least a part of its various forms).
  • the second computer program product in the computer-readable medium clearly embodies program instructions executable by a computer, and the computer extracts the above-described information extraction device ( However, it also functions as at least a part of its various forms).
  • the recording of the ROM, CD-ROM, DVD-ROM, hard disk or the like storing the computer program product. If the computer program product is read from a medium into a computer, or if the computer program product, which is a transmission wave, for example, is downloaded to a computer via communication means, the information multiplexing device or information extraction device of the present invention described above Can be implemented relatively easily. More specifically, the computer program product may also be configured with computer-readable code (or computer-readable instructions) that functions as the information multiplexing device or information extraction device of the present invention described above.
  • the generation unit and the process, the superimposing unit and the process are provided.
  • the detection means and the process, and the extraction means and the process are provided. Therefore, for example, original information such as copyright information can be easily and accurately multiplexed with information such as a video signal.
  • FIG. 1 is a conceptual configuration diagram of a system using an information multiplexing device and an information extraction device according to the present invention.
  • FIG. 2 is a conceptual diagram schematically showing a video signal, unique information, and a transmission time axis according to the present invention.
  • FIG. 3 is a conceptual diagram schematically showing a specific example of a period in which unique information according to the present invention is superimposed.
  • FIG. 4 A comparison between the frame period of a motion picture film, which is a reference in determining another specific example of the period in which the unique information according to the present invention is superimposed, and the frame period of, for example, NTSC video It is the schematic diagram shown.
  • FIG. 5 is a block diagram showing a basic configuration according to the first embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 6 is a flowchart (FIG. 6 (a)) showing an operation principle according to the first embodiment of the information multiplexing apparatus of the present invention and a flowchart (FIG. 6 (b)) showing a subroutine thereof. .
  • FIG. 7 is a block diagram showing a basic configuration according to the second embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 8 is a flowchart (FIG. 8 (a)) showing an operation principle according to the second embodiment of the information multiplexing apparatus of the present invention and a flowchart (FIG. 8 (b)) showing its subroutine. .
  • FIG. 9 is a block diagram showing a basic configuration according to the third embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 10 is a flowchart (FIG. 10 (a)) showing an operation principle according to the third embodiment of the information multiplexing apparatus of the present invention and a flowchart (FIG. 10 (b)) showing its subroutine. .
  • FIG. 11 is a block diagram showing a basic configuration according to the fourth embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 12 is a flow chart showing an operation principle according to the fourth embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 13 is a block diagram showing a basic configuration according to the fifth embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 14 is a schematic diagram schematically showing a pixel block in which DC component values of a DCT digital video signal according to a fifth embodiment of the information multiplexing apparatus of the present invention are arranged.
  • FIG. 15 is a flow chart showing the operation principle according to the fifth embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 16 is a schematic diagram schematically showing a process of embedding electronic permeability as a general example. Explanation of symbols
  • 10 Video signal, 20 ... Unique information, 100 ... Information multiplexing device, 101-AZD converter, 102 ... Blanking remover, 103 ... "Limiter, 104. VBI detector, 105 ... 106, spectrum spread modulator, 201 (301, 302) ... sine wave generator
  • FIG. 1 uses the information multiplexing device and the information extraction device according to the present invention. It is a notional block diagram of a system.
  • video signal 10 and unique information 20 such as copyright information are input to information multiplexing apparatus 100.
  • the information multiplexing apparatus 100 superimposes the unique information 20 on the video signal 10. More specifically, the information multiplexing apparatus 100 compresses and encodes the video signal 10 on which the unique information 20 is superimposed, for example, as a bit stream or a file, and outputs it to a network or a recording medium such as a CD or DVD. To do. Then, for example, a bit stream transmitted via a network or a file recorded on a recording medium or the like is input to the information extraction device 200.
  • the information extraction apparatus 200 decompresses and decodes the encoded video signal 10 recorded in the above-described bit stream or file, for example. Then, the superimposed unique information is extracted from the decoded video signal 10 and displayed on the monitor or recorded on the recording medium together with the video signal 10.
  • FIG. 2 is a conceptual diagram schematically showing a video signal, unique information, and a transmission time axis according to the present invention.
  • FIG. 3 is a conceptual diagram schematically showing a specific example of a period in which the unique information according to the present invention is superimposed.
  • FIG. 4 schematically shows a comparison between a frame period in a motion picture film, which is a reference in determining another specific example of a period in which unique information according to the present invention is superimposed, and a frame period in an NTSC video, for example. It is the schematic diagram shown. Note that video “A” to video “D” in FIGS. 2 to 4 show the same video frame.
  • the unique information 20 is multiplexed onto the video signal 10 on the transmission time axis in a predetermined cycle unit. More specifically, the unique information 20 is “1”, “0”, “1”, “1”, “0”,... , Image “B”, image “C”, image “D”, image “A”,..., DC component value indicating the average value of the luminance signal included in image “D”, in a predetermined cycle unit Is superimposed in synchronization with
  • the "predetermined cycle unit” may be a cycle unit based on 1Z60 seconds, which is a field cycle of the NTSC system, which is an example of the display method of the display, or 1Z30 seconds of the frame cycle. May be a periodic unit. Or PAL field The unit may be based on 1Z50 seconds, which is the cycle, or may be based on 1Z25 seconds, which is the frame cycle.
  • the total number of scanning lines in one frame is 525.
  • the frame period is 1Z30 seconds (33msec).
  • 1Z3 seconds (0.33 seconds) that is at least 10 times the frame period to 10 Z3 seconds (3.3 seconds) that is 100 times is desirable. This is because the original information is less affected by the deterioration of the video signal.
  • the amount of information in the filtering process is more accurately reduced, and the possibility of removing the unique information by the filtering process is reduced. That is, for example, 1 data (bit) unit power of original information is transmitted on the time axis in 3.3 seconds.
  • the "predetermined cycle unit” is preferably about 1.6 seconds (10Z6 seconds) to 2.0 seconds (12Z2 seconds). More specifically, as shown in FIG. 4, the frame period in motion picture film is 1Z24 seconds. On the other hand, the frame period in NTSC video is 1Z30 seconds. Therefore, the time of 4 frames of motion picture film, that is, 4Z24 seconds (1Z6 seconds) is equal to the time of 5 frames of NTSC video, that is, 5Z30 seconds (1Z6 seconds).
  • the vertical blanking interval (VBI) of movie film and the vertical blanking interval of NTSC video are beat ( In order to prevent (collision: beat), this 1Z6 seconds is the reference time, and it is desirable that the reference time is 10 times (1.6 seconds) to 12 times (2.0 seconds).
  • the predetermined cycle unit power is 2 seconds
  • one data (bit) unit of unique information is transmitted on the time axis in a time unit corresponding to 48 frames.
  • NTSC C video one data (bit) unit of unique information is transmitted on the time axis in a time unit corresponding to 60 frames.
  • FIG. 5 relates to the information multiplexing apparatus of the present invention.
  • FIG. 5 relates to the information multiplexing apparatus of the present invention.
  • 1 is a block diagram showing a basic configuration according to a first embodiment.
  • FIG. 6 is a flowchart (FIG. 6 (a)) showing an operation principle according to the first embodiment of the information multiplexing apparatus of the present invention and a flowchart (FIG. 6 (b)) showing its subroutine.
  • the first embodiment of the information multiplexing apparatus of the present invention is an A / D (Analog to Digital) transformation 101 to which an analog video signal is input 101, scanning of a video signal not including video information.
  • a / D Analog to Digital
  • the limiter 103 that suppresses the output amplitude below a predetermined value
  • the VBI Very blanking interval
  • the adder 111 A spread spectrum modulator 106 for performing spread spectrum modulation on the unique information 20 and the sync signal sync
  • a random signal table 107 for storing a randomization pattern used for the spread spectrum modulation of the sync signal sync of the unique information 20
  • the sync signal table 108 in which the sync signal sync is stored, the random information used for the spread spectrum modulation of the unique information 20 itself, and the random signal Buru 109, the specific information 20 is stored, is configured to include a Ru own information tapes Le 110,
  • the analog video signal 10a is input to the AZD converter 101 and the VBI detector 104 (step S10).
  • the AZD converter 101 performs AZD conversion of the analog video signal 10a (step S11).
  • the analog video signal 10a that has been AZD-converted by the blanking remover 102 is, for example, an S video (YZC) signal and a reference video synchronization signal (specifically, horizontal and vertical synchronization signals).
  • S video YZC
  • reference video synchronization signal specifically, horizontal and vertical synchronization signals.
  • the limiter 103 limits the amplitude of the separated S video signal.
  • dynamic range compression is performed (step SI 3). This dynamic range compression is to prevent luminance saturation due to data superposition. For example, if the maximum value of the superimposed data is “2”, the maximum value of the video data is clipped to “255-2”. To achieve higher altitude, change the input / output curve gradually from the specified range.
  • the VBI detector 104 detects 48 frame units in the movie film in the predetermined cycle unit of, for example, 2 seconds described in FIG. In NTSC video, 60 frame units are detected (step S14).
  • the adder 111 synchronizes with a predetermined cycle unit detected by the VBI detector 104, and a direct current component indicating an average value of the luminance signal of the analog video signal 10a.
  • the spread spectrum unique information 20 is superimposed on the value (step S15). More specifically, the spread spectrum unique information 20, that is, the spread spectrum data SI is synthesized and arranged after the spread spectrum synchronization information SS.
  • the average DC value is equal, and the image information included in the analog video signal 10a, that is, the amount of change for indicating the unique information 20 according to a predetermined position on one screen is made variable. May be. That is, in the screen area where the pixel brightness information or the color value bit value changes in a short time in one screen, the amount of change to carry the unique information 20 is increased. You may comprise. On the other hand, the luminance information of the pixel or the bit value of the color value may change for a long time, and the amount of change for carrying the unique information 20 may be reduced in the screen area. .
  • the randomization pattern used for the spread spectrum modulation of the synchronization signal sync of the unique information 20 is supplied from the random signal table 107 to the spread spectrum modulator 106 as the random signal RND 1 (step S16a).
  • the randomized pattern corresponds to a spreading code and is a bit string generated using a random function. More specifically, it is used for spread spectrum modulation of the sync signal sync, and a plurality of random patterns for detecting the sync signal sync, for example, 10 patterns are prepared.
  • the synchronization signal sync is supplied from the synchronization signal table 108 to the spread spectrum modulator 106 (step S 17a). More specifically, the data amount of the synchronization signal sync is, for example, 8 bits, and the synchronization signal pattern is, for example, “101010”.
  • the spread spectrum modulator 106 multiplies the synchronization signal sync by the random data RND1 to generate the spread spectrum synchronization signal SS (step S18a).
  • the spectrum spread modulator 106 can be configured by, for example, an exclusive OR circuit XOR or the like. More specifically, the spread spectrum synchronization signal SS is multiplied by, for example, the 10 randomization patterns described above to check whether the synchronization signal sync pattern can be restored or not. As a result, the sync signal sync can be detected.
  • the randomized pattern used for the spread spectrum modulation of the unique information 20 itself is supplied from the random signal table 109 to the spread spectrum modulator 106 as the random signal RND2 from the random signal table 109 simultaneously with or in succession to steps S16a to S18a. (Step S16b).
  • the unique information 20 is supplied from the unique information table 110 to the spread spectrum modulator 106 (step S 17b). More specifically, the data amount of the unique information 20 is, for example, 128 bits, and an error correction code (ECC: Error Correction Code) for error correction is added by 10 bits to be 138 bits.
  • ECC Error Correction Code
  • the spread spectrum modulator 106 multiplies the unique information 20 with the random data RND2 to generate spread spectrum data SI (step S18b).
  • the spread spectrum modulator 106 synthesizes the spread spectrum synchronization signal SS generated in step S18a and the spread spectrum data SI generated in step S18a (step S19).
  • the spread spectrum is applied to the synchronization signal sync and the unique information 20, but the spread spectrum may be applied only to the unique information 20.
  • a randomization pattern used for the spread spectrum modulation of the synchronization signal sync that is, a randomization pattern for detection of the synchronization signal sync
  • a randomization pattern used for the spread spectrum modulation of the unique information 20 For example, correspondence is made according to a predetermined rule such as a table or a function. Therefore, random to spread spectrum of unique information 20 It is possible to change the function itself or its type. In this way, by combining the information regarding the correspondence relationship of the randomized pattern with the unique information 20, the data amount of the unique information 20 can be reduced.
  • one data (bit) unit of the unique information 20 is the average value of the luminance signal of the analog video signal 10a in units of 2 seconds. Is superimposed on the DC component value indicating.
  • the unique information 20 in one logical unit having one meaning is stored in time. It takes about 292 seconds (about 5 minutes) to transmit on the axis.
  • copy control information CCI: Copy Control Information
  • a region code indicating regional information can be used. It is.
  • the data amount is composed of 2 bits. More specifically, it is possible to indicate three types of information: “11” meaning None Copy, “10” meaning Copy Once, and “00” meaning Copy Free.
  • the unique information 20 is a region code, for example, the data amount is composed of 8 bits.
  • FIG. 7 is a block diagram showing a basic configuration according to the second embodiment of the information multiplexing apparatus of the present invention.
  • the second embodiment of the information multiplexing apparatus of the present invention is similar to the first embodiment described above in AZD conversion 101, blanking remover 102, limiter 103, and VBI detector 104.
  • a sine wave generator 201 for generating a single sine wave signal carrying the unique information 20 and a controller 202 are provided.
  • FIG. 8 is a flowchart (FIG. 8 (a)) showing an operation principle according to the second embodiment of the information multiplexing apparatus of the present invention and a flowchart (FIG. 8 (b)) showing its subroutine. ). Steps similar to those in the first embodiment are denoted by the same step numbers, and description thereof will be omitted as appropriate.
  • the superimposer 105 synchronizes with a predetermined cycle unit detected by the VBI detector 104 to generate a DC component value indicating the average value of the luminance signal of the analog video signal 10a.
  • a single sine wave signal carrying unique information 20 is superimposed (step S20). Specifically, when the unique information 20 is “0”, for example, a single sine wave signal may be added to the DC component value described above.
  • the unique information 20 force S “l” it may be configured not to add, for example, a single sine wave signal to the DC component value.
  • a sine wave signal subjected to phase modulation or frequency modulation may be superposed in synchronism with a predetermined period unit.
  • the sine wave generator 201 is synchronized with a predetermined cycle unit detected by the VBI detector 104, for example, a single sine wave.
  • the signal may be generated or may not be generated.
  • step S21 it is determined whether or not the unique information 20 is “1” (step S21).
  • step S 21: Yes for example, a single sine wave signal is generated in synchronization with a predetermined period unit detected by the VBI detector 104.
  • step S22 On the other hand, when the unique information 20 is “0” (step S21: No), step S22 is omitted and a single sine wave signal is not generated.
  • FIG. 9 is a block diagram showing a basic configuration according to the third embodiment of the information multiplexing apparatus of the present invention.
  • the third embodiment of the information multiplexing apparatus of the present invention is similar to the first embodiment described above in AZD conversion 101, blanking remover 102, limiter 103, and VBI detector 104.
  • a sine wave generator 301 that generates a first sine wave signal
  • a sine wave generator 302 that generates a second sine wave signal
  • a phase shifter 303 that generates a phase shifter 303
  • an adder 304 and a controller 2 02 It is prepared for.
  • the frequency of the second sine wave signal may be configured to be, for example, twice or 10 times the frequency of the first sine wave signal.
  • the unique information 20 is carried by the phase difference between the first sine wave signal and the second sine wave signal.
  • FIG. 10 is a flowchart (FIG. 10 (a)) showing an operation principle according to the third embodiment of the information multiplexing apparatus of the present invention, and a flowchart (FIG. 10 (b)) showing its subroutine. ).
  • FIG. 10 (a) a flowchart showing an operation principle according to the third embodiment of the information multiplexing apparatus of the present invention
  • FIG. 10 (b) a flowchart showing its subroutine.
  • the superimposer 105 generates a DC component value indicating the average value of the luminance signal of the analog video signal 10a in synchronization with a predetermined cycle unit detected by the VBI detector 104.
  • a signal obtained by adding the first sine wave signal and the second sine wave signal is superimposed (step S30).
  • the direct current component value described above has a first sine wave signal and a phase difference of 0 degree from the first sine wave signal (ie, A signal obtained by adding the second sine wave signal (with no phase difference) may be superimposed.
  • the unique information 20 is “1”
  • the first sine wave signal and the second sine wave signal having a phase difference of 90 degrees from the first sine wave signal are added to the DC component value. You may comprise so that a signal may be superimposed.
  • the copy control information is Copy Free, that is, the original information is “00”, and a predetermined phase difference is obtained. Therefore, if the first and second sine wave signals are superimposed, the removal process using the filter etc. becomes difficult. The Therefore, it is very effective for protecting the copyright of the video signal.
  • the sine wave generators 301 and 302 are synchronized with a predetermined cycle unit detected by the VBI detector 104 in the first period. And the second sine wave signal is generated (step S31).
  • step S32 it is determined whether or not the unique information 20 is “1” (step S32). If the unique information 20 is “1” (step S32: Yes), the phase shifter 303 adjusts the second sine wave signal to have a phase difference of 90 degrees from the first sine wave signal. (Step S33). On the other hand, when the unique information 20 is “0” (step S32: No), step S33 is omitted and the phase difference of the second sine wave signal is not adjusted.
  • the adder 304 adds the first sine wave signal and the second sine wave signal (step S 34).
  • FIG. 11 is a block diagram showing a basic configuration according to the fourth embodiment of the information multiplexing apparatus of the present invention.
  • the fourth embodiment of the information multiplexing apparatus of the present invention is substantially the same as the first embodiment described above, and includes AZD conversion 101, blanking remover 102, limiter 103, and In addition to the VBI detector 104, a frame delay device 401a, 401b, 401c, which delays the analog video signal 10a by one frame period, indicates the average value of the luminance signal for each frame unit included in the analog video signal 10a.
  • DC detection output unit 402 for detecting and outputting component values, Calo-calculators 403a, 403b, and 403c, half-unit 404 that calculates and outputs “lZ2” times the input DC component value, and unique information 20 are recorded ROM 405, subtracter 406, counter 407 for measuring the frame unit detected by VBI detector 104, and controller 202.
  • ROM 405 for detecting and outputting component values
  • Calo-calculators 403a, 403b, and 403c half-unit 404 that calculates and outputs “lZ2” times the input DC component value
  • unique information 20 are recorded ROM 405, subtracter 406, counter 407 for measuring the frame unit detected by VBI detector 104, and controller 202.
  • FIG. 12 is a flowchart showing the operation principle according to the fourth embodiment of the information multiplexing apparatus of the present invention. Steps similar to those in the first embodiment are denoted by the same step numbers, and description thereof will be omitted as appropriate.
  • the average value of the DC component values of the luminance signals of two odd frames is calculated as the DC component value of the luminance signal of the even frames existing between the two odd frames.
  • the original information 20 is superimposed by adding or subtracting a predetermined offset amount to the reference value. This is significantly different from the first to third embodiments in which unique information is superimposed on the DC component value.
  • step S40 the analog video signal 10a is delayed by one frame period by the frame delay unit 401a (step S40). This delay process is performed based on the measurement in units of frames detected by the VBI detector 104 by the force counter 407.
  • the limiter 103 performs dynamic range compression to limit the amplitude of the analog video signal 10a delayed by one frame period (step S41).
  • the DC detection output unit 402 detects and outputs the DC component value of the luminance signal for each frame unit included in the analog video signal 10a (Step S40). S42).
  • the DC component value of the luminance signal of the analog video signal 10a delayed by two frame periods by the frame delay devices 401b and 401c, the adder 403a, and the half device 404, and the analog video signal 10a without delay The average value of the luminance signal and the DC component value is calculated and output (step S43). More specifically, for example, the DC component value of the luminance signal for each frame is set for the first frame Fl, the second frame F2, and the third frame F3 in the order in which the time advances. Assuming fl, f2, and f3 in order, this average value is "(f l + f3) Z2 ”. If “1 + £ 3) 72” is less than “0”, “0” may be set, and if “1 + £ 3) 72” is larger than “255”, “255” may be set.
  • ROM405, U controller 202, and force calculator 403b [Thus, ROM405 [This is the average value calculated to carry the unique information 20 recorded]
  • a predetermined offset amount is added or subtracted (step S44). Specifically, when the unique information 20 is “0”, for example, “2” of a predetermined offset amount may be subtracted from the above average value “(fl + f3) Z2”. . That is, “((f 1 + f 3) / 2) 2”. On the other hand, when the unique information 20 is “1”, for example, “2” of a predetermined offset amount may be added to the average value “(fl + f3) Z2” described above. That is, “((fl + f3) Z2) +2”.
  • Step S45 the difference between “((f 1 + f3) / 2) + a ⁇ added with a predetermined offset amount“ a ”and“ f 2 ”is calculated.
  • step S46 it is determined whether or not the calculated difference is greater than a predetermined threshold under the control of the controller 202 (step S46).
  • step S46: Yes when the calculated difference is larger than the predetermined threshold (step S46: Yes), the difference is added to the DC component value of the luminance signal of the analog video signal 10a delayed by one frame period (step S47).
  • step S46 the difference is added to “f2”.
  • the DC component value (“f 2”) of the luminance signal of the analog video signal 10a delayed by one frame period changes relatively small, “((f 1 + f3) / 2)
  • step S46: No the result of the determination in step S46 is that the calculated difference is not greater than the predetermined threshold (step S46: No)
  • step S4 7 the addition of the difference in step S4 7 is omitted, that is, 1
  • the DC component value (“f 2”) of the luminance signal of the analog video signal 10a delayed by the frame period is used as it is.
  • step S46 determines whether the DC component value (“f 2”) of the luminance signal of the analog video signal 10a delayed by one frame period changes relatively significantly, the DC component value (“f 2”) Adopted (so-called reset). Note that the determination process in step S46 may be omitted, and the difference may always be added in step S47.
  • FIG. 13 is a block diagram showing a basic configuration according to the fifth embodiment of the information multiplexing apparatus of the present invention.
  • FIG. 14 is a schematic diagram schematically showing a pixel block in which the DC component value of the DCT digital video signal according to the fifth embodiment of the information multiplexing apparatus of the present invention is arranged.
  • the digital video signal lOd is subjected to discrete cosine transform (DCT).
  • DCT discrete Cosine Transform
  • DCT Discrete Cosine Transform
  • image information is DCTed and quantized in units of 8 ⁇ 8 pixel blocks, This is encoded data.
  • FIG. 14 in the pixel at the left corner, the direct current component value of the luminance information of the entire block of 8 ⁇ 8 pixels is shown.
  • the encoded data is decoded by being inversely quantized and further subjected to inverse DCT conversion.
  • the average value of the DC component values of the luminance signals of the two odd frames such as the DCT digital video signal 10d force
  • the unique information 20 is superimposed by adding or subtracting a predetermined offset amount to or from the reference value of the direct current component value of the luminance signal of the even frame that exists in the middle of several frames. This is different from the first to third embodiments in which unique information is superimposed on the DC component value. to differ greatly.
  • the fifth embodiment according to the information multiplexing apparatus of the present invention includes a frame memory 501 to which a DCT digital video signal 10d is input, and a frame unit included in the DCT digital video signal 10d.
  • DC calculator 502 that calculates and stores the DC component value indicating the average value of each luminance signal
  • average calculator 503 that calculates the average value of the DC component values of odd frames included in the DCT digital video signal 10d
  • An adder 504 a frame memory 500, and a frame memory 506 are provided.
  • FIG. 15 is a flowchart showing the operation principle according to the fifth embodiment of the information multiplexing apparatus of the present invention.
  • the digital video signal 10d subjected to DCT is stored in the frame memory.
  • step S50 It is stored in 501 (step S50).
  • the average value of the DC component values of the odd frames included in the CT-converted digital video signal 10d is calculated (step S51).
  • the adder 504 adds / subtracts the predetermined information carrying the unique information 20 to the average value of the DC component values of the odd frames output from the average calculator 503, That is, they are superimposed (step S52).
  • Average power of DC component values of odd frames on which predetermined information carrying unique information 20 is superimposed is stored in frame memory 505 as DC component values of even frames (step S5).
  • odd frame force may be stored in the frame memory 506.
  • the information multiplexing apparatus and method, the information extracting apparatus and method, and the computer program according to the present invention can be used for an information multiplexing apparatus for multiplexing unique information such as MP3 files and moving picture images, and It can be used as an information extraction device for extracting unique information.
  • the present invention can also be used for information multiplexing devices and information extraction devices that are mounted on various computer devices for consumer use or business use, or that can be connected to various computer devices.

Abstract

L’invention concerne un dispositif de multiplexage d’informations pour surimposer une information unique (20) à un signal vidéo (10a) introduit selon une unité de cycle prédéterminée (“ seconde/trame ” et “ seconde/champ ”). Le dispositif de multiplexage d’informations comprend un moyen de génération (106, etc.) pour générer un signal d’informations ne transportant que l’information unique et un moyen de multiplexage (105, etc.) pour surimposer le signal d’informations généré à une valeur de composante CC (valeur de composante CC, valeur moyenne CC) indiquant la valeur moyenne du signal de luminosité d’une unité de cycle prédéterminée contenue dans le signal vidéo en fonction de l’unité de cycle prédéterminée.
PCT/JP2005/015760 2004-08-31 2005-08-30 Dispositif et méthode de multiplexage d’informations, dispositif et méthode d’extraction d’informations et programme informatique WO2006025382A1 (fr)

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US11641269B2 (en) 2020-06-30 2023-05-02 Rampart Communications, Inc. Modulation-agnostic transformations using unitary braid divisional multiplexing (UBDM)

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