KR20070077002A - Method for scramble and descramble using multiple image data and system for performing the same - Google Patents

Abstract

A scrambling and descrambling method using a plurality of image information, and a system for performing the method are provided to scramble and descramble all combined image information at one time by replacing and mixing vertical and horizontal lines of one combined frame. A scrambling unit includes a color encoding part(1), a frame synchronizing part(2) for synchronizing frames of video signals for channels encoded by the color encoding part, a frame combination part(3) for combining the frames into one frame of a matrix type, and a vertical horizontal line mixing part(4) for replacing vertical and horizontal lines of the one combined frame line by line and mixing the lines. A descrambling part includes a frame synchronizing part for synchronizing frames of scrambled channels transmitted from the vertical horizontal line mixing part, a frame combination decoding part for decoding combination of the synchronized frames, a vertical horizontal line decoding part for restoring the decoded frames, and a color decoding part for restoring colors of the channels.

Description

Scramble and descramble method using multiple image information and system for performing the same {method for scramble and descramble using multiple image data and system for performing the same}

1 is a block diagram illustrating a scramble device for preventing pay-TV broadcast tapping according to the present invention.

2 is a block diagram illustrating a descrambling apparatus for preventing pay-TV broadcasting eavesdropping according to the present invention.

3 is a diagram illustrating a frame matrix of a frame combination unit in a scrambler and a descrambler according to the present invention.

Figure 4 is an exemplary view showing a horizontal line mixing method in the scramble and descramble device according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1: color encoding unit 2, 5: frame synchronization unit

3: Frame combination part 4: Vertical and horizontal line mixing parts

6: Frame combination decoder 7: Vertical and horizontal line decoder

8: color decoding unit

The present invention relates to a scramble and descrambling method using a plurality of pieces of image information, and a system for performing the same. In particular, a plurality of frames representing a plurality of pieces of image information (FRAME) can be prevented from illegally tapping pay TV broadcasts. Are combined into one frame in a matrix form, and the frames combined into one frame replace and mix vertical and horizontal lines with line-to-line, respectively, so that a plurality of images can be scrambled and descrambled at once. It relates to a scramble and descramble method using information and a system for performing the same.

In general, a cable TV broadcasting system is used by connecting a cable TV broadcasting line to a TV public broadcasting line of an apartment or a building. In the case of such cable TV broadcasting, other free channels other than the scrambled broadcasting channel can be watched, so that wiretapping is performed to watch general programs of cable TV broadcasting without paying a subscription fee. It will interfere with the operation of a comprehensive cable broadcasting station, which is operated by the income of the TV subscribers, and it will cause frequent breakdowns of the tracks by intercepting prayers who are connected to the cable TV line laid underground or underground. There was a problem such as being.

Conventional broadcast signal scramble and descrambling methods for preventing eavesdropping set an arbitrary point on a horizontal line to cut a video signal based on this point, and the video signal section at an earlier timing centering on the cutting point. It is common to use a line rotation scheme in which a video signal section having a backward timing is replaced with a scrambled video signal, and a receiver receives information about a cutting point from a broadcasting station and restores a scrambled signal to an original signal.

However, such a line rotation method is difficult to maintain a high level of security because the technique is too well known, and also a method of scramble and descramble an arbitrary cutting point on a horizontal line. The deterioration in image quality due to signal modulation is inevitably caused, and it is not easy to solve the fundamental problems caused by eavesdropping because it cannot cope with a sufficient amount for illegal eavesdropping.

In order to prevent eavesdropping as described above, all channels of cable TV broadcasting must be scrambled and transmitted.However, due to a cost relationship, a general cable TV broadcasting channel is usually 20 or more unscrambled channels and two or three scrambled pay channels. Since the channel is being broadcast, it is more difficult to operate pay-TV broadcasting. When scrambled all the channels by the line rotation method, image quality is deteriorated, which makes it difficult to provide high-definition video.

The present invention has been invented to solve the above problems, and scrambles for n TV broadcasting channels transmitted through a cable TV broadcasting line, and n frames generated in n channels are converted into one frame in a matrix form. Combination of vertical and horizontal lines by line-to-line by pixel unit can be combined to scramble and descramble all n channels to maintain a high level of security, thereby preventing pay TV broadcast eavesdropping. A first object of the present invention is to provide a scramble and descramble method capable of preventing image degradation.

A second object of the present invention is to provide a system capable of performing the first object described above.

The present invention for achieving the first object

Scramble that randomly mixes and transmits the video signals of the n broadcast channels by combining the n frames of the n broadcast channels into one frame and replacing the vertical lines and the horizontal lines of the combined frames with pixel units, respectively. step; And

The scrambled signal is received to reconstruct and rearrange video signals of the arbitrarily mixed channels, recombine them in units of frames, decode pixels in horizontal lines and vertical lines of the recombined frames, and rearrange them in the original order. Includes a descrambling step.

In addition, the present invention for performing the above second object,

a color encoding unit 1 for color encoding video signals of n channels CH1-CHn; A frame synchronizer (2) for timing matching (synchronizing) the frames of the video signals for each channel with the n video signals for each of the channels (CH1-CHn) encoded by the color encoder (1); A frame combiner (3) connected to an output side of the frame synchronizer (2) for outputting a plurality of frames, which are video signals for each channel in a synchronized form, as video signals combined into one frame in a matrix form; Scramble means including a vertical / horizontal line mixing section (4) connected to the output side of said frame combining section (3) to replace and mix the vertical and horizontal lines of the frame combined into one frame by line to line;

A frame synchronizer (5) for matching (synchronizing) the frame timing of the scrambled channels (CH1'-CHn ') transmitted by the vertical / horizontal line mixing section (4) of the scramble means; A frame combination decoding unit (6) connected to an output side of the frame synchronization unit (5) for restoring and rearranging (decoding) the combination of frames for each channel synchronized; Connected to the output side of the frame combination decoding unit 6 and connected to the output side of the vertical / horizontal line decoding unit 7 and the vertical / horizontal line decoding unit 7 to restore the frames of the decoded broadcast channels. And descramble means comprising a color decoding section 8 to recover the color of the &lt; RTI ID = 0.0 &gt;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a pay TV broadcast eavesdropping prevention scramble device according to the present invention, Figure 2 is a block diagram showing a pay TV broadcast eavesdropping prevention descrambling device according to the present invention. In addition, Figure 3 is a view showing a frame matrix of the frame combination in the scrambler and the descrambler according to the present invention, Figure 4 is an illustration for showing a horizontal line mixing method in the scrambler and descrambler according to the present invention It is also.

The scramble and descramble method for preventing pay-TV broadcasting eavesdropping according to the present invention combines n frames, which are image information of n broadcast channels, into one frame in a matrix form, and combines the combined frames into vertical and horizontal lines in pixel units. Each of the combined image information can be scrambled at once by substituting and mixing each line-to-line, and descrambled all the image information at once by decoding the mixed image information into vertical and horizontal lines.

That is, in the present invention, in the scramble of n broadcast channels, the combined frames are combined by combining the order of combining the n frames generated in each channel into one frame in a matrix form. Each is replaced by line-to-line mixing.

As shown in FIG. 1, the scramble system for preventing pay TV broadcast eavesdropping according to the present invention is provided at the output terminal of the color encoding unit 1 for color encoding video signals for each of the n channels CH1-CHn. The frame synchronizer 2 is connected to timing-synchronize (synchronize) the frames of the video signals for each channel with the video signals for each of the n channels CH1-CHn encoded by the color encoder 1. On the output side of the frame synchronization unit 2, a frame combination unit 3 for outputting a plurality of frames, which are video signals for each channel in a synchronized form, as a video signal combined into one frame in a matrix form is connected. On the output side of the section 3, a vertical and horizontal line mixing section 4 for connecting and mixing the vertical lines and the horizontal lines of the frames combined into one frame by line to line is connected.

In addition, the descrambling system for preventing pay-TV broadcasting eavesdropping according to the present invention, the frame timing of the scrambled channel (CH1 '-CHn') transmitted from the vertical and horizontal line mixing section 4 of the scramble system of FIG. And a frame combination decoding section 6 for restoring and rearranging (decoding) the combination of the frames for each channel synchronized on the output side of the frame synchronization section 5, which includes a frame synchronization section 5 for matching (synchronization). do. On the output side of the frame combination decoding unit 6, a vertical and horizontal line decoding unit 7 for restoring the frames of each decoded broadcast channel is formed, and on the output side of the vertical and horizontal line decoding unit 7, the color of each channel is shown. And a color decoding section 8 for reconstructing.

The scrambling and descrambling method of the video signal according to the present invention configured as described above will be described below.

First, in the scramble operation of the video signal illustrated in FIG. 1, first, the color encoding unit 1 receives video signals of n channels CH1-CHn, respectively, and modulates the colors of the respective channel frames so that the frame synchronization unit ( Supply to 2). The frame synchronization unit 2 supplies the frame combination unit 3 with timings of the frames of the input video signals for each channel. The frame combination unit 3 combines the video signals of each channel in units of frames to form one frame.

As shown in FIG. 3, the frame combination unit 3 combines n frames generated in n channels into one frame in a matrix form. The position of each frame of the n channels combined into one frame in the matrix form is not fixed, and the combination sequence is mixed and rearranged into one frame. The vertical / horizontal line mixing unit 4 connected to the output side of the frame combining unit 3 mixes the frame formed by the frame combining unit 3 by replacing the horizontal line and the vertical line with lines to lines, respectively, in units of pixels. Scramble with.

That is, as shown in FIG. 4, in the vertical / horizontal line mixing unit 4, the horizontal line is mixed by replacing the horizontal lines with line-to-line, and the vertical line mixing method is the same as the horizontal line mixing method.

According to the present invention, the scrambled video signal is in a state in which video information of the first channel CH1 to the nth channel CHn is mixed in each channel from the first channel CH1 to the nth channel CHn. This is modulated into a scrambled form that makes viewing impossible.

Since the scrambled video signal is modulated by a combination of n-channel frames and vertical / horizontal line mixing, it is necessary for a third party to recognize the video signal even if the channel is tuned and viewed. It becomes a sufficiently scrambled form, thus maintaining a high level of security, and because all channels CH1-CHn are scrambled, unregistered illegal eavesdroppers cannot watch pay-TV broadcasts.

A method of descrambling to watch a scrambled video signal is as follows.

The frame synchronizing means 5 of the descrambler of FIG. 2 supplies the frame combination decoder 6 by timing matching the frames of the video signals CH1'-CHn for each channel transmitted by the scrambler of FIG. . The frame combination decoding unit 6 reconstructs and rearranges the video signals of each arbitrarily combined channel and recombines them in units of frames to form one frame. The vertical and horizontal line decoding unit 7 decodes the frame constituted by the frame combination decoding unit 6 into horizontal and vertical lines of the frame. The color decoding 8 receives the decoded video signals of the n channels CH1-CHn, respectively, and restores the color of each channel frame.

Here, in the scramble and descrambling method of the video signal according to the present invention, S (Substitution) -BOX, which is a non-linear random number table, is used in the step of combining n frames into one frame in a matrix form. The generation process for generating the random number S-BOX generates a Galois Field (aka Finite Field) and GF (2 ⁿ ) using a minimum polynomial. Galoache GF (2 ⁿ ) generated at this time is a number system having 2 ⁿ elements, and is very useful for implementing algorithms in information theory, sign theory, and cryptography. This feature of galloache is not calculated mathematically by using any basis in addition of galloche GF (2 ⁿ ), but is treated as a logical sum of each bit (XOR), and the element is represented by a regular basis. , Squared is easily implemented by just shift operation. Therefore, in the encryption scheme, the efficiency depends on the computational speed, so galloise performs fast computations. Therefore, the present invention uses galloace in the S-BOX design. Then, a random number table S-BOX is generated through an affine transformation of the transformed value on the generated GF (2 ⁿ ). The matrix used for the affine transformation is a symmetric matrix. Also, the generated S-BOX values do not overlap with each other.

In the step of combining n frames in a matrix form into one frame in the scramble of the video signal according to the present invention, the size of the random number table S-BOX is determined according to the number of channels to be combined. Recombine the frame matrix using.

In the scramble of the video signal according to the present invention, the frame-to-line replacement method combines the frames by substituting the line-to-line using S-BOX, which is a random number table, in the same manner as the matrix combination method. The size of the random number table depends on the number of lines in the combined frame.

Also, the descramble method decodes a frame replaced with a line-to-line using an inverse S-BOX.

In this manner, the subscriber converts the video information transmitted through the scrambler into the original signal through the descrambler, thereby enabling normal broadcasting viewing.

The present invention enables to achieve the effect of preventing illegal eavesdropping at a lower cost than the line rotation method by scrambling and transmitting a plurality of TV broadcast channels at once, and at a cutting point generated when performing modulation of a conventional horizontal one line. It is possible to provide a high quality image by preventing the degradation of the image quality.

In addition, in the scramble of the TV broadcast signal, the present invention combines a plurality of frames generated by each channel into a single frame in a matrix form, and combines one frame into a vertical line and a horizontal line in pixel units. By substituting and mixing lines, scrambles are performed on all channels, and the receivers of illegally connected wired broadcasting lines cannot watch TV broadcasts, thereby maintaining high security and incompatibility.

As described above, the scramble and descramble method using the image information according to the present invention and a system for performing the same, the vertical line and the horizontal line of the combined frame by combining a plurality of frames generated in a plurality of channels into one frame Since scramble is performed by mixing lines by line and replacing lines by line, each channel of pay broadcasting can be scrambled. Therefore, high security can be maintained and illegal eavesdropping can be prevented. Since the video signal is scrambled by replacing the pixel with the line and the line in the vertical line and the horizontal line, the original frame image can be preserved intact, and thus the deterioration of the image quality can be minimized when descrambled. It is possible to provide high definition image quality.

In addition, since illegal eavesdropping is prevented, anxiety about illegal eavesdropping can be solved at a paid broadcasting station, and an operation such as preventing an eavesdropping operation of a broadcasting station can be prevented.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited thereto and may be improved or modified by those skilled in the art within the scope of the technical idea of the present invention.

Claims (4)

Scramble that randomly mixes and transmits the video signals of the n broadcast channels by combining the n frames of the n broadcast channels into one frame and substituting the vertical and horizontal lines of the combined frames for each pixel line by line. step; And The scrambled signal is received to reconstruct and rearrange video signals of the randomly mixed channels in a frame unit, decode the pixels in horizontal and vertical lines of the recombined frame, and rearrange them in the original order. The scramble and descramble method using the image information comprising a descrambling step. The method of claim 1, wherein the scrambling comprises: receiving image signals of the n channels, respectively, and modulating a color of each channel frame; Synchronizing and synchronizing the frame of the video signal for each channel input by color modulation in the step; Combining the frames of the n video signals generated in the n channels synchronized in the step into one frame in a matrix form; In the step, the scrambling and descramble using the image information comprising the step of mixing the frame of the video signal consisting of one frame in a matrix form by replacing the horizontal line and the vertical line by line to line, respectively Way. The method of claim 1, wherein the descrambling step comprises: timing matching a frame of a video signal for each channel scrambled and transmitted; Reconstructing and rearranging video signals of each channel arbitrarily combined after the step and recomposing them into frames to form one frame; Reconverting the horizontal line and the vertical line of the frame of the video signal composed of one frame by line to line, respectively, in pixels, and receiving the decoded video signals of the n channels, respectively, and receiving the color of each channel frame. The scramble and descramble method using the image information comprising the step of restoring the received. a color encoding unit 1 for color encoding video signals of n channels CH1-CHn; A frame synchronizer (2) for timing matching (synchronizing) the frames of the video signals for each channel with the n video signals for each of the channels (CH1-CHn) encoded by the color encoder (1); A frame combiner (3) connected to an output side of the frame synchronizer (2) for outputting a plurality of frames, which are video signals for each channel in a synchronized form, as video signals combined into one frame in a matrix form; Scramble means including a vertical / horizontal line mixing section (4) connected to the output side of said frame combining section (3) to replace and mix the vertical and horizontal lines of the frame combined into one frame by line to line; A frame synchronizer (5) for matching (synchronizing) the frame timing of the scrambled channels (CH1'-CHn ') transmitted by the vertical / horizontal line mixing section (4) of the scramble means; A frame combination decoding unit (6) connected to an output side of the frame synchronization unit (5) for restoring and rearranging (decoding) the combination of frames for each channel synchronized; Connected to the output side of the frame combination decoding unit 6 and connected to the output side of the vertical and horizontal line decoding unit 7 and the vertical and horizontal line decoding unit 7 for restoring the frames of the decoded broadcast channels. A scramble and descramble system using image information including a descramble means including a color decoder (8) for restoring the color of the channel.

Images