JP4109580B2 - Digital watermark presentation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic watermark presentation device for presenting a digital watermark on the video displayed on the display, such as L CD, CRT or PDP.
[0002]
[Prior art]
In general, video information such as a television program and video data disclosed on the Internet can be easily edited by using a part of the video information by development of an editing device or a recording device. Therefore, for the purpose of eliminating illegal use of video information, a technique for embedding a digital watermark for displaying a copyright at a predetermined position has been developed (for example, see Patent Document 1).
[0003]
In addition, with the above-described technology for embedding a digital watermark, it is often difficult to eliminate unauthorized use of video information shot by a shooting camera because the digital watermark is often embedded when editing video information once shot. It becomes. For this reason, various devices have been proposed in which a digital watermark is embedded at the same time when photographing with a photographing camera (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
JP 2002-10058 (paragraph numbers 0023 to 0055, FIGS. 1 to 3)
[Patent Document 2]
JP 2002-262060 A (paragraph numbers 0009 to 0022, FIGS. 1 to 3)
[0005]
[Problems to be solved by the invention]
However, the conventional means for embedding digital watermarks have the following problems.
In the conventional means for embedding a digital watermark, a digital watermark indicating copyright is embedded in the video information data. For example, the video information displayed on the display screen is again photographed by an imaging means such as a CCD camera (hereinafter referred to as “image information”). In this case, it is impossible to detect a digital watermark. For this reason, it is difficult to clearly present the copyright when, for example, a video for one minute after a predetermined time has elapsed from the beginning of the program in the recaptured video information.
[0006]
In particular, in the video information in the program produced in the broadcast station, if the shooting site is in the back of a dense forest, or a solitary island in the sea, etc., it takes a lot of trouble and costs at the time of shooting, Even if a digital watermark is embedded in the video information at the time of shooting, it is difficult to prove the copyright for the video information when the re-captured video is partially used.
[0007]
Furthermore, when the recaptured video information is released on the Internet or resold on a recording medium such as a magnetic tape, CD, or DVD, it can be mechanically retrieved as identifiable data such as a digital watermark. If it is not in a state, there is only a method for manually checking a huge number of video information, and even if such a new video is found, if not all of the original video information is diverted, It was difficult to prove the right, and in effect allowed unauthorized use.
[0008]
The present invention has been made in view of the above-described problems, and even video information that has been retaken can be embedded by presenting a copyright and capable of being mechanically searched. and to provide a can be Ru electronic watermark presentation device can be.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an electronic watermark presenting apparatus according to the present invention displays the video on a display screen for displaying the video obtained from the video signal and presents a digital watermark indicating the copyright of the video. A digital watermark presenting apparatus, wherein a reception unit that receives a radio wave on which the video signal and an irradiation signal to be output as the digital watermark are superimposed, and the video signal and the irradiation signal are received from the radio wave received by the reception unit. Detection means for detecting the color signal, color synchronization means for performing color synchronization of the color signal included in the video signal detected by the detection means, and demodulating the color signal synchronized by the color synchronization means to obtain three primary colors. Color demodulating means for RGB pixels, color signal output means for outputting the RGB pixels demodulated by the color demodulating means, and colors for displaying the RGB pixels output by the color signal outputting means And示素Ko were an irradiation signal output means for outputting an irradiation signal detected by said detecting means, and emitting element that outputs an illumination signal outputted by the irradiation signal output means as said electronic watermark, the arrangement comprising a.
[0010]
With this configuration, the digital watermark presenting apparatus first receives the video signal (video / audio signal) by the receiving unit, detects the color signal and the irradiation signal from the video signal by the detecting unit, and the color signal is Synchronization is achieved by the color synchronization means, the color signal is demodulated by the color demodulation means, and the demodulated color signal is output to the color display element by the output means, thereby displaying an image. At the same time, the digital watermark presenting apparatus is in a state where the irradiation signal detected by the detection means is output to the output element by the irradiation signal output means, and the digital watermark is presented by infrared rays or ultraviolet rays that are not visible on the screen.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an electronic watermark Hisage shows apparatus according to the present invention will be described with reference to the drawings. 1 and 2 are reference examples, FIG. 1 is a perspective view schematically showing a digital watermark embedding method, and FIG. 2 is a cross-sectional view schematically showing a light beam irradiation apparatus.
As shown in FIG. 1, in the digital watermark embedding method, a video projection device 1 that projects and displays a video A on a screen 2 that is a display surface, and a video A that is displayed by the video projection device 1 are overlapped. The electronic watermark a1 is projected and presented from the light irradiation device 3 by infrared rays or ultraviolet rays and embedded.
[0016]
As shown in FIG. 2, the light irradiation device 3 presents an identification mark such as a company logo on the screen 2 as digital watermark a1 as data indicating the copyright of the video A by infrared rays.
[0017]
This light irradiation device 3 includes an infrared light emitting unit (infrared light bulb) 3a for irradiating infrared rays installed in a cylindrical body 3g, and a drive circuit (flip-flop circuit) 3b for driving the infrared light emitting unit 3a by turning on a power switch. A condensing lens 3c that converts the infrared light emitted from the infrared light emitting unit 3a into a plane wave and imparts directivity to the infrared light, a liquid crystal shutter 3d that blocks or transmits the infrared light from the condensing lens 3c, and the liquid crystal A movable convex lens 3e and a concave lens 3f for projecting the infrared rays transmitted from the shutter 3d on the screen 2 in focus, a liquid crystal shutter driving means 3h for driving the liquid crystal of the liquid crystal shutter 3d, and the liquid crystal shutter driving means 3h. The input means 3j for inputting the pattern (digital watermark) to be presented, and the input means 3j The input image display means 3k for displaying the actually presented pattern as an image image in the color contrast or color, and the lenses 3c, 3e, 3f and the liquid crystal shutter 3d are moved back and forth along the cylindrical body 3g. Moving means 3m.
[0018]
The light beam irradiation device 3 inputs a pattern such as a character to be presented as the digital watermark a1 by the input unit 3j, and sets which position on the screen and how much range to display. For example, when a pattern (for example, N, H, and K, see FIG. 1) to be presented is input by the input means 3j of the light irradiation device 3, a state formed by infrared rays that are blocked and transmitted by the liquid crystal shutter 3d is schematically input. It can be displayed and confirmed on the image display means 3k. The pattern displayed on the input image display means 3k is a digital watermark a1 (see FIG. 1) that cannot be recognized on the screen, and can be recognized when detected via the detection device 20 (see FIG. 4). It is.
[0019]
Next, in the light irradiation device 3, numerical values inputted from the input means 3j to the lenses 3c, 3e, 3f and the liquid crystal shutter 3d so that the digital watermark (pattern) a1 formed by the liquid crystal shutter 3d is focused on the screen 2. It is moved and adjusted via the moving means 3m according to the data. In the light irradiation device 3, since it cannot actually be confirmed on the screen 2, the pattern (digital watermark) schematically displayed on the input image display screen 3k sets the focal length of the screen 2 to an appropriate position. Is set on the screen in a state of being in focus, and is set in advance so as to be indicated as a state of out of focus when the focal length is not appropriate.
[0020]
As shown in FIG. 1, when the setting of the light irradiation device 3 is completed, when the movie is actually shown in a movie theater or the like, the liquid crystal shutter 3d is placed on the screen 2 from the light irradiation device 3. Then, the electronic watermark a1 may be projected and presented at a predetermined position of the video A by infrared rays.
[0021]
Therefore, the video A presenting the digital watermark a1 by the light irradiation device 3 is illegally shot by a third party with a CCD camera, a video camera, etc., and an appropriate video is edited to create an illegal video video. Even if the image is sold on a recording medium or on the Internet, the image with the digital watermark a1 is displayed when the image is taken with the video camera. Further, for example, when the electronic watermark a1 using infrared rays is mechanically detected by the detection device 20 as shown in FIG. 4, it can be detected through a pattern matching technique using a reference pattern prepared in advance. It is.
[0022]
Note that the detection device 20 outputs a video image as a result of detection by the detection means 21 such as pattern matching, which is detected by inputting a video signal from the Internet 40 via the playback device 30 or the terminal 41, and the like. Means 22 is provided, and the video data output from the output means 22 is displayed on the display device 31 and can be confirmed. Even when the position of the digital watermark a1 cannot be specified, the detection device 20 can detect the digital watermark a1 by pattern matching if the screen is scanned with the reference pattern.
[0023]
Next, the digital watermark presenting apparatus will be described with reference to FIG. FIG. 3 is a schematic diagram schematically showing a digital watermark presenting apparatus. Note that the audio / video signal received and displayed by the digital watermark presenting apparatus 10 is an irradiation signal that can be presented by emitting an electronic watermark a2 by infrared rays or ultraviolet rays by an emission element 11b arranged in the display unit 11 to be described later. It is what is superimposed.
[0024]
As shown in FIG. 3, the digital watermark presenting apparatus 10 includes a display unit 11 and a control unit 12. The display unit 11 includes an RGB element 11a displayed by RGB pixels demodulated from the video signal, and an output element 11b arranged adjacent to the RGB element 11a for presenting the digital watermark a2 by infrared rays or ultraviolet rays. It has. Here, the emitting element 11b emits infrared rays. When mechanically photographing with a CCD camera or the like, the emitting elements 11b can emit infrared rays so that the digital watermark a2 is displayed in the recaptured video. Is.
[0025]
The control unit 12 includes a receiving unit 12a that receives a video / audio signal received by an antenna, a detection unit 12b that detects the video / audio signal received by the receiving unit 12a, and a detection unit 12b that detects the video / audio signal. The color synchronization unit 12c for synchronizing the color of the color signal thus generated, the color demodulation unit 12d for demodulating the color signal color-synchronized by the color synchronization unit 12c as an RGB pixel, and the RGB pixel demodulated by the color demodulation unit 12d The color signal output means 12e for output, the irradiation signal output means 12f for outputting the irradiation signal detected from the video / audio signal by the detection means 12b, and the synchronization for synchronizing the irradiation signal output means 12f and the color signal output means 12e. Means 12g.
[0026]
The detection unit 12b of the control unit 12 detects and extracts a video signal, an audio signal, and an irradiation signal from a video / audio signal amplified by a video intermediate frequency amplifier circuit (not shown). As an example, the detection means 12 can be configured by forming a detection circuit with a diode or the like.
[0027]
The irradiation signal output means 12f outputs a signal indicating which position of the emission element 11b is to be turned on by the irradiation signal detected by the detection means 12b. For example, the irradiation signal output unit 12f presents the electronic watermark a2 on the screen by the emission element 11b that is turned on based on the detected irradiation signal. The presented digital watermark a2 is set in advance by the transmission side so as to have a different pattern for each video.
[0028]
The synchronizing unit 12g synchronizes the RGB pixel output from the color signal output unit 12e and the irradiation signal output from the irradiation signal output unit 12f. The synchronization unit 12g is configured to be able to present the digital watermark a2 at an appropriate position in any image frame, and is particularly effective when the digital watermark a2 is changed in position with respect to each frame of the video. Become. Further, when the position of the digital watermark a2 is always presented at a certain position such as the center of the frame, the synchronization unit 12g is not necessary. If there is no synchronization means 12g, the irradiation signal output means 12f outputs an irradiation signal to the emission element 11b, and the color signal output means 12e outputs RGB pixels to the RGB element 11a.
[0029]
The control unit 12 is the same as that for displaying a video from a general video / audio signal in the configuration other than the irradiation signal output unit 12f for presenting the digital watermark a2, and therefore the details will be described. Omitted.
[0030]
Next, the operation of the digital watermark presenting apparatus 10 will be described.
First, the video / audio signal to be transmitted to the digital watermark presenting apparatus 10 is set in advance in a state where a pattern indicating copyright is superimposed on the video as an irradiation signal on the transmission side.
[0031]
When the digital watermark presenting apparatus 10 receives the video / audio signal by the receiving means 12a, the video signal and the audio signal are detected by the detection means 12b and output through the respective means, and are respectively displayed as images on the display unit 11 by the RGB element 11a. While being displayed as a video, audio corresponding to the video is output from a speaker (not shown). At the same time, in the digital watermark presenting apparatus 10, the irradiation signal is output from the irradiation signal output means 12f based on the irradiation signal detected from the video / audio signal by the detection means 12b, and the digital watermark a2 is displayed on the display unit 11 via the output element 11b. The state presented above.
In the digital watermark presenting apparatus 10, the video displayed on the display unit 11 is visible, but the digital watermark a <b> 2 is displayed on the video when mechanical imaging such as a CCD camera is performed. It will be in a state to be.
[0032]
Therefore, when a third party retakes a video with a photographing device such as a video camera for the purpose of malicious editing, the digital watermark a2 is displayed regardless of the scene of the video, and the detection device 20 Thus, the rightful copyright holder can claim the infringement of the right to the video.
[0033]
As described above, in the digital watermark embedding method and the digital watermark presenting apparatus according to the present invention, it has been described that a pattern indicating copyright by infrared rays is emitted from the screen as a digital watermark and presented. On the other hand, it is possible to present with ultraviolet light or invisible light as long as it is a light beam that has little influence and is not visible and can be detected by a detection device.
[0034]
In the digital watermark presenting apparatus, the irradiation signal is superimposed on the video / audio signal sent from the transmission side, and infrared rays are emitted from the emission element to form the digital watermark. However, as another configuration, for example, video is distributed. A digital watermark indicating a copyright corresponding to the broadcasting station of the channel may be presented in conjunction with the channel device.
[0035]
【The invention's effect】
As described above, in that electronic watermark presentation device written in the present invention is excellent effects described below.
[0037]
In the digital watermark presenting apparatus, based on the irradiation signal superimposed on the video / audio signal sent by the transmission side, the digital watermark can be presented by infrared rays or the like from the emitting element installed on the display screen. Even if a third party re-photographs and edits, a digital watermark is embedded in the scenes for all the videos, and it is possible to claim copyrights for the videos based on legitimate rights.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing a digital watermark embedding method as a reference example .
FIG. 2 is a cross-sectional view schematically showing a light beam irradiation apparatus used for a digital watermark embedding method as a reference example .
FIG. 3 is a schematic diagram schematically showing a digital watermark presenting apparatus according to the present invention.
FIG. 4 is a schematic diagram schematically showing a detection apparatus for detecting a digital watermark presented by the digital watermark embedding method or the digital watermark presenting apparatus according to the present invention.

Claims (1)

An electronic watermark presenting apparatus for displaying the video on a display screen for displaying a video obtained from a video signal and presenting a digital watermark indicating a copyright of the video,
Receiving means for receiving a radio wave on which the video signal and an irradiation signal to be output as the digital watermark are superimposed; a detecting means for detecting the video signal and the irradiation signal from the radio wave received by the receiving means; and Color synchronization means for performing color synchronization of the color signals included in the video signal detected by the detection means, and color demodulation means for demodulating the color signals synchronized by the color synchronization means to obtain RGB pixels which are the three primary colors. A color signal output means for outputting the RGB pixels demodulated by the color demodulation means; a color display element for displaying the RGB pixels output by the color signal output means; and an irradiation signal detected by the detection means. An electronic watermark presenting apparatus comprising: an irradiation signal output unit that outputs the irradiation signal output by the irradiation signal output unit as the digital watermark.

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