JPH053562A - Copy guard system and system for guardying its copy - Google Patents

Abstract

PURPOSE:To provide the copy guard system and the copy guarding system having the high degree of privacy at a video theater system using a VTR. CONSTITUTION:At the video theater system composed of a telecine device 2 to execute the photoelectric conversion of a movie film and to execute color correction, VTR unit 3 to prepare a master tape from the telecine device 2, VTR unit 6 to execute dubbing from the master tape to a tape 7 for distribution, VTR 8 to reproduce the tape 7 for distribution, controller unit 8 and projector, the copy guard system execute a copy guard processing between the VTR for reproduction from the time point of dubbing from the master tape 4 to the tape 7 for distribution and as the copy guard processing method, the copy guarding system scrambles pictures with scan line transition or polarity inversion while maintaining synchronizing signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a video signal copy guard system and a copy guard system in a video theater system which telecines a motion picture film and screens it on a VTR tape.

[0002]

2. Description of the Related Art In the 1955's, the movie industry, which had about 7,500 movie theaters and dominated the Japanese image industry,
After that, he gave up his position on TV and was greatly affected by video rentals in recent years, and the number of buildings decreased to 1912 in 1989.

On the other hand, in the situation in the United States, movie theater facilities have been rationalized and new establishments of cinema complex type have been prosperous. In recent years, the number of movie theaters has increased from about 20,000 to 24,000, and Box office income is also increasing.

The Japanese movie industry has taken various measures such as rationalization of movie theater facilities, deluxe seating and the establishment of a new mini theater in order to stop the above-mentioned decline, but the effect is still rising. Absent.

In such a situation of the movie world, video theaters for projecting video instead of film have come to be seen in various places. These video theaters are installed in supermarkets and department stores in collaboration with distribution companies rather than as independent movie theaters. 10 seats
It consists of around 0, and the operation is completely automated. The VTR tape for distribution used in this video theater is made up of blocks as shown in FIG. 5 and reproduced.

In FIG. 5, 1 is a motion picture film,
Reference numeral 2 is a telecine device for converting the motion picture film 1 into a VTR tape. Usually, the telecine device 2 performs color correction after photoelectric conversion to improve color reproducibility. Reference numeral 3 is a digital VTR for recording a telecine signal, and the master tape 4 is made up here. Next, from the digital VTR tape 4 to the M2 format VTR (AU-650: manufactured by Matsushita Electric Industrial Co., Ltd.) 6
Are used to make a large number of distribution tapes 7. Each theater uses the distribution tape 7 for screening. In the theater, the M2 format VTR 8 is used and several VTRs are input to the selector 9 to select an output image. The selected video signal is the ED / WD digital scan converter 1
After inputting 0 and making it dense, the image is projected from the projector 11.

[0007]

The distribution tape used in the above video theater is a VTR for distribution after telecine a movie film to make a master tape.
Dubbed on tape and supplied to theaters around the world.

However, since the management of the distribution tape supplied to each theater is entrusted to the theater, it is likely to be dubbed, which may affect the rental video industry. There are also video tapes that have a copy guard, but most of them are horizontal sync signals in the video signal that have undergone a slight copy guard process, and the video part itself remains on the tape. Was relatively easy.

In view of the above problems, the present invention provides a copy guard system and a copy guard system with high confidentiality in a video theater system.

[0010]

A copy guard system of the present invention for solving the above problems comprises a telecine device for photoelectrically converting a motion picture film for color correction, and a VTR device for producing a master tape from the telecine device. , VTR dubbing from the master tape to distribution tape
In a video theater system including a device, a VTR for reproducing the distribution tape, a controller device, and a projection device, a reproduction VTR from the time of dubbing from the master tape after the telecine to the distribution tape.
In the copy guard system, the copy guard process is performed while maintaining at least the synchronizing signal of the video signal, and the copy guard is released by the device and circuit after the VTR for reproduction.

In the copy guard system of the present invention, a telecine device for photoelectrically converting a motion picture film for color correction, a VTR device for producing a master tape from the telecine device, and a VTR device for dubbing from the master tape to a distribution tape. And a VTR that reproduces the distribution tape
In a video theater system consisting of a controller device and a projecting device, the video guard system is a copy guard system in which at least the video signal is scrambled by scanning line transition or polarity inversion while maintaining the sync signal of the video signal.

[0012]

In the copy guard system of the present invention, copy guard processing is performed at the time of dubbing on the distribution tape, and the output of the reproducing VTR is reproduced in a scrambled state while maintaining at least the synchronizing signal of the video signal. Since the system for descrambling and canceling the copy guard by the devices and circuits after the VTR for reproduction, the distribution tape does not have a normal screen image recorded, and can have an extremely high degree of confidentiality.

Further, in the copy guard system of the present invention, the video signal is scrambled by scanning line transition or polarity inversion while maintaining the sync signal, so that the sync signal is maintained and the VTR can reproduce even in the scrambled state. Therefore, it is very efficient because it can be operated simply by adding a descrambling device and a circuit to the conventional theater system. Furthermore, scanning line transition and polarity reversal are used in combination as necessary, but both systems use a transmission system, VTR,
It has a feature that deterioration of restored image quality due to incomplete characteristics of a projector or the like is unlikely to occur.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A copy guard system and a copy guard system thereof according to the present invention will be described below with reference to the drawings. (Example 1) (Fig. 1) is a movie film showing an example of the present invention.
It is a block diagram until it is converted into a tape for TR and is shown in a video theater. Although the entire configuration is almost the same as the conventional system, a polarity reversing circuit 2C is added to the output portion of the telecine device 2, and a circuit 12a for reversing the polarity is added inside the projector. In this system configuration, after performing telecine from the motion picture film 1, polarity inversion was performed. This copy guard processing is preferably performed after color correction, but may be performed before color correction. This polarity reversal is the reversal of the waveform of the video signal excluding the sync signal, and the screen becomes a screen corresponding to the negative of a photograph with respect to the regular screen. Although the copy guard release processing is performed in the projector 11 which is considered to be the most preferable, when it is performed in the selector 9 or the ED / WD digital scan converter 10, the confidentiality is slightly lowered, but a monitor can be installed on the contrary. Had the advantage.

As described above, from the time of copying from the master tape 4 to the distribution tape 7, copy guard processing is performed while maintaining at least the video signal synchronizing signal between the reproducing VTRs 8 and copying is performed by a device and a circuit after the reproducing VTR 8. By releasing the guard, a highly confidential copy guard system and copy guard system were realized. (Embodiment 2) In the system configuration of (FIG. 2), the copy guard process was performed at the stage of copying from the master tape 4 to the distribution tape 7, and the copy guard release process was performed at the controller output portion. As the copy guard processing here, scrambling was applied by the scanning line transfer method. Reference numeral 30 is a scrambler for applying this scramble, and 31 is a descrambler.

In this method, as shown in (FIG. 3), the effective screen of each field is set to 240 scanning lines, and the effective screen of each field is set to 3 lines.
Divide into blocks of 0 line or 60 lines. The generation of these two types of blocks is randomized, and the scanning lines within each block are also randomized. This can make it difficult to decipher the block boundaries. In this case, the scramble key is added during the vertical blanking period, and the descrambler side restores based on this key. Also, since scrambling is performed while maintaining the synchronization signal, D / A conversion is performed after scrambling.
It can be recorded on the M2VTR as it is. Furthermore, the transmission of the video signal in this part is performed by Y (luminance signal) and P _B , P _R.
The component signal (color difference signal) is used. On the other hand, the video signal transmitted to the projector in the theater is also composed of component signals of Y (luminance signal) and P _B and P _R (color difference signals).

The distribution tape copied in the scrambled state was reproduced on the VTR of the theater and selected, and then descrambled. FIG. 3 shows a configuration of the scanning line transferred image restoration device. The replacement of the scanning lines is performed by digitizing an image and then writing it in the memory 21 by designating an address by a random number controlled by a scramble key. Therefore, when performing scrambling, the reverse order has been taken so that the order of the scanning lines is restored when such processing is performed on the receiving side.
In the copy guard system as described above, the scramble can be applied, the VTR can be recorded and reproduced as it is, and the extremely high copy guard can be realized.

[0018]

As is apparent from the above description, in the copy guard system of the present invention, copy guard processing is performed at the time of dubbing on the distribution tape, and the VTR for reproduction is used.
Is a system that reproduces in a scrambled state while maintaining at least the synchronizing signal of the video signal and descrambles it with a device and a circuit after the VTR for reproduction to release the copy guard. Since the image on the screen is not recorded, it can have an extremely high degree of confidentiality.

Further, in the copy guard system of the present invention, the video signal is scrambled by scanning line transition or polarity inversion while maintaining the sync signal. Therefore, the sync signal is maintained and the VTR can be reproduced even in the scrambled state. Therefore, it is very efficient because it can be operated simply by adding a descrambling device and a circuit to the conventional theater system. Furthermore, scanning line transition and polarity reversal are used in combination as necessary, but both systems use a transmission system, VTR,
It is a copy guard capable of coping with the image quality of a theater system because it has a feature that deterioration of restored image quality due to incompleteness of characteristics of a projector or the like is unlikely to occur, and the industrial value of the present invention is extremely great.

[Brief description of drawings]

FIG. 1 is a block diagram of polarity reversal from a motion picture film in the first embodiment of the present invention, conversion to a VTR tape, and display at a video theater.

FIG. 2 is a block diagram of scanning line transfer from a motion picture film in the second embodiment of the present invention, conversion to a VTR tape, and display in a video theater.

FIG. 3 is a diagram showing image scrambling of scan line transition in the second embodiment of the present invention.

FIG. 4 is a block diagram of a descrambler in the second embodiment of the present invention.

FIG. 5 is a block diagram of converting a conventional motion picture film to a VTR tape and showing it in a video theater.

[Explanation of symbols]

1 movie film 2 Telecine equipment 2a photoelectric converter 2b color corrector 2c polarity reversing circuit 3,5 VTR for master 4 master tape 6 Dubbing VTR 7 Distribution tape VTR for playback 9 AV controller 10 ED / WD Digital Scan Converter 11 Video projector 11a polarity reversing circuit 20 A / D converter 21 Video memory 22 D / A converter 23a, 23b random number generator 30 scrambler 31 descrambler

Claims (7)

[Claims] 1. A telecine device for photoelectrically converting a motion picture film to perform color correction, a VTR device for producing a master tape from the telecine device, a VTR device for dubbing the master tape onto a distribution tape, and the distribution tape. In a video theater system consisting of a VTR for reproducing video, a controller device, and a projecting device, at least a video signal synchronization signal is maintained between the reproducing VTRs from the time of dubbing from the master tape after the telecine to the distribution tape. As it is, the copy guard processing is given,
A copy guard system characterized in that the copy guard is released by a device and a circuit after the VTR for reproduction. 2. The copy guard system according to claim 1, wherein the copy guard processing is performed before or after color correction during telecine. 3. The copy guard system according to claim 1, wherein the copy guard release processing is performed within a projector or a display that displays a final normal image. 4. The copy guard canceling process is a reproduction VT.
2. The copy guard system according to claim 1, wherein the output of R is released in a selector or a controller. 5. The copy guard system according to claim 1, wherein the video signal from the master tape after telecine to the VTR for reproduction is transmitted as a component signal. 6. A telecine device for photoelectrically converting a motion picture film to perform color correction, a VTR device for producing a master tape from the telecine device, a VTR device for dubbing from the master tape to a distribution tape, and the distribution tape. In a video theater system including a VTR for reproducing a video, a controller device, and a projecting device, at least scanning line transfer or video scrambling by polarity inversion is performed while maintaining a video signal synchronization signal. Copy guard method. 7. The copy guard system according to claim 6, wherein the scramble information of the scan line transition is transmitted during the blanking period of the vertical synchronizing signal.