KR20040098900A - Processing Method and Device for Image Encryption and Decryption - Google Patents

Abstract

PURPOSE: A method and system for encoding and decoding images are provided to allow a user to view video contents only when the video signals of the video contents are decoded, thereby preventing persons under age from watching video contents for adults. CONSTITUTION: At least one main video contents(1) and at least one supplementary video contents(2,3,4) are selected. When the main video contents and the supplementary video contents are played, the video signals corresponding to the main video contents and the supplementary video contents are simultaneously input to a composite video signal processing unit(5). Then, the composite video signal processing unit synthesizes the video signals. While the video signals are synthesized, a markup signal(6) is simultaneously added to respective fields of the main video contents, to achieve encoded composite video contents(7).

Description

Processing Method and Device for Image Encryption and Decryption

The present invention relates to a method and apparatus for processing image encryption and decryption. More specifically, when a video signal is output without performing an encryption process by encrypting a video object, the viewer may view only an image in which multiple video signals are superimposed. The present invention relates to a technology that prevents minors and others from viewing limited screening grades by making them viewable.

At present, since the video signal is simply mounted on a video tape or a video disc, anyone can conveniently view the video tape or the video disc. In other words, as soon as the video tape or the video disc is inserted into the play device and operated, the signal mounted thereon can be seen.

However, all video tapes and video discs are rated to prevent minors from viewing inappropriate images. In general, a movie or video is divided into four grades: General Screening Grade (G), Parental Guidance Needs Grade (PG), Parent Stronghold Rating (PG-13), and Restricted Screening Grade (R). Of these ratings, limited-screening videos are considered the most difficult to regulate because, despite these classifications, these ratings are available without restriction in retail or rental stores.

Therefore, in order to cope with the problems caused by the limited screening video, some video producers are applying a mosaic method to the video signal displayed on the video. The principle of mosaicing is to impart a mosaic signal to an image that is not appropriate to be seen. For example, obscene images can be pixelated. After this process, the pixels of the image become larger, and the image becomes as if it were seen through the mosaic window. The pixelation process first sums up the gray levels of all the pixels in the mask and then obtains their average. The average value is then rewritten in the gradation of each pixel in the mask. As a result, inappropriate portions (violent or highly exposed portions) of the image are blurry and cannot be seen clearly.

However, even if an image is encrypted by applying a mosaic signal to the video signal being displayed, the image resolution after the encryption is not increased, and thus the color vision effect is worsened. In addition, the manufacturing cost of the mosaic signal is very expensive and the descriptor is merely to prevent the image from being clearly seen, so that an unclear image is continuously displayed on the screen. This in turn means that the image is not completely blocked. As a result, for example, there is an opportunity for young people to be fantasized about the content of pornographic images.

A more serious problem is that mosaic signal decoding devices are commercially available that decode the images to view the images. Thus, encryption using mosaic signals is not an ideal way to prevent minors from viewing limited screening footage.

The present invention was developed to overcome the disadvantages and limitations of the above mosaic technology, in the present invention, by adding a video signal to the video object, the video image that is screened when the video is screened without performing the decoding process It is an object to make a signal invisible, that is, to be able to see a video image only when the decoding process is performed.

1 is a flowchart illustrating an image encryption processing method according to the present invention.

FIG. 2 is a schematic diagram illustrating an encryption processing method for the image field illustrated in FIG. 1.

3 is a schematic block diagram of an image decoding circuit according to the present invention.

4 is a flowchart of an image decoding process according to the present invention.

The purpose and technical configuration of the present invention will be more clearly understood through the following description which will be described with reference to the accompanying drawings.

1 is a flowchart illustrating an image encryption processing method according to the present invention. As illustrated in FIG. 1, in the image encryption and decryption processing method and apparatus according to the present invention, a markup signal, that is, a password, is assigned to a video signal of an image. Therefore, when displaying an image without decoding the markup signal, only the composite video signal overlaid with the multiple video signal is recognized by the viewer. In other words, the viewer is unable to see the actual video signal. Therefore, limited screening grades may be blocked and not visible to minors. Unauthorized leaks of business confidential information can be prevented in the same way.

The image selection method is performed as a first step for the image encryption method. Specifically, at least one main image 1 and at least one auxiliary image 2, 3, 4 are selected. When the main image 1 and the sub image 2, 3, 4 are screened, the video signal is input to the composite video signal processing unit 5.

As a second step, an image synthesizing step is performed. Specifically, when the video signals of the main video object 1 and the sub video materials 2, 3, and 4 are simultaneously input to the composite video signal processing unit 5, the synthesized video signal In the processing unit 5, the synthesis and overlapping operations of the video signals are performed. In the meantime, in the synthesizing step, the markup signal 6 is added to each field of the main image 1 at the same time, thereby completing the encrypted composite image 7.

FIG. 2 is a schematic diagram showing an encryption processing method for the image field shown in FIG. 1. As shown in FIG. 2, in the process of synthesizing the video signals of the main image 1 and the sub images 2, 3, and 4, the markup signal 6 added to each field of the main image 1 is It consists of a pattern formed by a horizontal synchronizing signal and a vertical synchronizing signal. When an image is played on the play device, if the play device (not shown) reads and recognizes the markup signal 6, the play device reads only the video signal including the markup signal 6. . In the meantime, the image seen by the play device (not shown) does not include an image having multiple overlapping signals, but includes a video signal having a markup signal 6. Conversely, if the play device (not shown) does not have a decoding device, the image shown will be a superimposition of multiple video signals.

3 is a schematic block diagram of an image decoding circuit according to the present invention, and FIG. 4 is a flowchart of an image decoding processing process according to the present invention. 3 and 4, when an encrypted composite video image is displayed, an image decoding device is used for decoding the image. The image decoding device comprises an encoding unit 8, a memory unit 9, a detection control unit 10 and a decoding unit 11. The functions of each component of the image decoding apparatus are as follows.

a) The encoding unit 8 is an analog / digital converter for converting an analog video signal of an encrypted composite image into a digital video signal output.

b) The memory unit 9 is a dual port memory that stores the digital video signal output by the encoding unit 8.

c) The detection control unit 10 detects the markup signal 6 and controls the reading and writing of the memory to determine whether the data in the memory unit 9 should be updated.

d) The decoding unit 11 is a digital / analog converter for converting the digital image data stream output from the memory unit 9 into an analog video signal output.

When the analog video signal in the encrypted composite image is converted into a digital video signal by an analog / digital converter, the digital video signal output is stored in the memory unit 9. The detection control unit 10 determines whether the data in the memory unit 9 should be updated. This decision is made through the following process.

1) First step: The horizontal sync signal and the vertical sync signal of the image set the position of the markup signal.

2) Step 2: Each sample value of the sampling signal is compared with the sample value of another sampling signal at the markup signal position.

3) Step 3: If the sample value is larger than the comparison value, 1 is increased in the internal accumulator.

4) Step 4: If the internal accumulator is larger than the preset value, the data in the memory should be updated. On the contrary, if the internal accumulator is smaller than the preset value, the data need not be updated.

On the other hand, in the present application, reading of data is not controlled. Instead, the data in the memory is sequentially output to a digital to analog converter so that the digital data stream is converted to an analog video signal output, so that the viewer can view the main picture.

In addition, the image encryption processing method according to the present invention can be applied not only to limited screening grade video, but also to commercial video such as a company advertisement. In addition, confidential information of the company can be protected from being leaked or leaked.

In addition, the image encryption and decryption processing method and apparatus according to the present invention can be installed in a monitor. Thus, in the case of broadcasting a limited screening program on a cable TV station or on a TV station other than a cable, it is possible to prevent the viewer from viewing the program without using a decoding method and a related device.

As described above, according to the present invention, it is possible to effectively prevent a minor from viewing the video of the limited screening grade.

Claims (11)

An image encryption processing method for encrypting a main video, Acquire one or more primary images and one or more auxiliary images; When the at least one main picture and the at least one sub picture are displayed, a video signal is simultaneously input to a composite video signal processing unit for video signal synthesis processing; When composite video signal processing is performed on video signals of at least one main picture and at least one sub picture, a markup signal is simultaneously applied to each field of the main picture, thereby completing an encrypted composite picture. Image encryption processing method characterized in that. The method of claim 1, And the synthesized video signal processing unit synthesizes the video signals of the at least one main picture and the at least one sub picture by overlapping the video signals. The method of claim 1, And said markup signal is a synchronization signal. The method of claim 3, And the synchronization signal comprises a horizontal synchronization signal and a vertical synchronization signal. The method of claim 4, wherein And the pattern of the markup signal is set by a horizontal synchronizing signal and a vertical synchronizing signal. An image decryption apparatus for performing a decryption process of an encrypted composite video screened through a play device, An encoding unit which performs encoding processing of the encrypted image; A memory unit for storing an encoded digital signal; A detection control unit that detects a markup signal and controls reading and writing of the memory to determine whether data in the memory unit should be updated; And And a decoding unit for converting the digital image data stream output from the memory unit into an analog video signal output. The method of claim 6, And said encoding unit is an analog to digital converter. The method of claim 6, And the memory unit is a dual port memory. The method of claim 6, And said decoding unit is a digital to analog converter. An image decryption processing method for performing a decryption process of an encrypted composite video screened through a play device, Storing the digital video signal output in a memory unit after the analog video signal of the encrypted composite image is converted into a digital video signal output through an analog / digital converter; Determining, via a detection control unit, whether to update data in the memory; And And the data in the memory is sequentially output to a digital / analog converter such that the digital data stream is converted into an analog video signal output and thereby allows the viewer to view the main picture. The method of claim 10, Determining whether to update the data in the memory, Setting the position of the markup signal according to the horizontal synchronizing signal and the vertical synchronizing signal of the image; Compare each sample value of the sampling signal with the sample value of another sampling signal at the markup signal position; If the sample value is greater than the comparison value, 1 is increased in the internal accumulator; If the internal accumulator is larger than the preset value, the data in the memory must be updated; if the internal accumulator is smaller than the preset value, the data does not need to be updated.