KR101483653B1 - Null frame using image encrypting system - Google Patents

Abstract

The present invention relates to an image encrypting system using a null frame. More particularly, the present invention relates to an image encrypting system which transmits position information of an frame I using a key pad to a null frame, and decodes position information of the frame I included in a null frame in a reception side using a null frame which may be encoded if exactly knowing the position information of the frame I in real time in the null frame. The image encrypting system using a null frame according to the present invention includes: a CCTV (100) which photographs an image and converts the photographed image into an ES (Element Stream) image signal to transmit the ES image signal; a transmitter (200) which receives and encrypts an ES image signal provided from the CCTV (100) to transmit the encrypted image signal; a receiver (300) which receives and decodes the encrypted image signal provided from the transmitter (200) to transmit the decoded image signal; and a monitor (400) which receives and images the encoded image signal provided from the receiver (300). When the transmitter (200) designates a predetermined value which is randomized and output, position information of the frame I is modulated and packetized, the position information of the frame I is inserted into a null packet of the null frame so that the position information of the frame I in the null packet of the null frame is changed.

Description

[0001] The present invention relates to a NULL frame image encoding system using a null frame,

The present invention relates to a video encoding system using a null frame, and more particularly, to a video encoding system using a null frame, and more particularly, to a system and method for transmitting an I frame position information using a keypad in a null frame, The present invention relates to a video encoding system using a null frame capable of decoding only the position information of an I frame in a null frame in real time.

Generally, digital audio has been used in various fields such as communication, computer, and home electronics, and the problem of storing or transmitting a large amount of data has arisen.

In order to solve these problems, the Motion Picture Experts Group (MPEG) -1 standard of the International Organization for Standardization was established in 1991 and extended to multiple channels, and the international standard for MPEG-2 was completed in November 1994 . MPEG-2 is wide

Is capable of providing a high-quality image and a coverage area, and is attracting attention in all industrial fields such as broadcasting, home appliances and communication.

The transmission rate in the digital broadcasting transmission system based on the MPEG-2 algorithm differs from system to system, and the transmission rate is determined by the bit rate of video, audio and data broadcasting signals and null packets.

According to the international standard for MPEG-2, null packets (packets transmitted to keep the transmission rate constant without valid data) are inserted irregularly considering only the MPEG-2 decoding buffer model and transmitted. It's worthless.

It is just abandoned.

In detail, the conventional null packet was used only for the purpose of maintaining a constant data rate. That is, in multiplexing video, audio, and data broadcast signals, the bit rate sum of video, audio, and data broadcast signals is calculated, and the calculated bit rate and the data rate are compared.

Also, in the method of filling the null packet, irregular insertion is performed without consideration of the MPEG-2 decoding buffer model alone. This not only makes it difficult to locate the null packet within the received video / audio transport stream,

It was even more impossible to use such null packets as information packets.

Accordingly, there is a need for a method and apparatus for inserting a null packet into a video / audio transport stream to be transmitted regularly so as to improve performance in a digital broadcasting transmission and reception system using the same .

To solve these problems, Korean Patent No. 10-0448220 has been proposed.

The prior art includes a null packet removing unit for removing a null packet inserted irregularly in an externally applied video / audio transport stream; A null packet bit rate calculator for calculating a bit rate of the null packet; A GUI (Graphical User Interface) for determining a transmission period of a periodic null packet to be newly inserted by an external user based on the calculated bit rate; A periodic null packet generator for generating a periodic null packet according to the determined transmission period; A multiplexer for periodically inserting the generated periodic Null packets in a priority order, inserting a video / audio transport stream from which the irregular Null packets have been removed, and multiplexing the processed video / audio transport streams; An aperiodic null packet generator for generating and inserting an aperiodic null packet under the control of the multiplexer when the output rate of the multiplexed transport stream is different from the input rate of the video / audio transport stream input from the outside; And a PCR correcting unit for correcting and outputting a changed PCR (Program Clock Reference) value of the multiplexed transport stream, so that a null packet to be inserted is inserted regularly in the transport stream for the purpose of maintaining a constant data rate Thereby improving the performance of the transmission and reception system by using it as an information packet. In addition, the robust stream is inserted regularly in the video / audio transport stream and transmitted, thereby improving the DTV reception performance.

However, the prior art can improve the performance of the digital broadcasting transmission and reception system by regularly inserting null packets into the video / audio transport stream (TS) and using them as information packets, And encrypts the video signal.

1. Korean Patent No. 10-0448220 entitled " Null Packet Insertion Method and Apparatus in Digital Broadcasting Transmission System "(Registered on September 19, 2004)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for correcting positional information of an I frame by packet- It is an object of the present invention to provide a video encoding system using a null frame that can decode only the position information of an I frame in a null packet of a null frame in real time.

The present invention according to the present invention is a video encoding system using a null frame, comprising: a CCTV for capturing an image and converting the captured image into an ES (Element Stream) video signal and transmitting the video; A transmitter for receiving and encrypting the ES video signal transmitted from the CCTV and transmitting the encrypted video signal; A receiver for receiving and decoding the encrypted video signal transmitted from the transmitter and transmitting the decoded video signal; And a monitor for receiving and imaging the decoded video signal transmitted from the receiver; If a predetermined value to be randomized and outputted in the transmitter is designated, the position information of the I frame is modulated and packetized, and the position information of the I frame is inserted into the null packet of the null frame, The positional information of the positional information is changed.

As described above, since the image encoding system using the null frame according to the present invention can decode only the position information of the I frame in the null packet of the null frame, it is difficult to hack the image information.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of a video encoding system using a null frame according to the present invention; FIG.
FIG. 2 is a block diagram of the transmitter of FIG. 1; FIG.
3 is a block diagram of the configuration of the receiver of FIG.

Hereinafter, a video encoding system using a null frame according to the present invention will be described in detail with reference to the detailed description of embodiments with reference to the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and they may vary depending on the intentions or customs of the client, the operator, the user, and the like. Therefore, the definition should be based on the contents throughout this specification.

Like numbers refer to like elements throughout the drawings.

FIG. 1 is a schematic block diagram of a video encoding system using a null frame according to the present invention. FIG. 2 is a block diagram of a transmitter of FIG. 1, and FIG. 3 is a block diagram of a receiver of FIG.

1 to 3, a video encoding system using a null frame according to the present invention includes a CCTV 100 for capturing an image and converting the captured image into an ES (Element Stream) A transmission unit 200 for receiving and encrypting the ES video signal transmitted from the CCTV 100 and transmitting the encrypted video signal, and a transmission unit 200 for receiving and decoding the encrypted video signal transmitted from the transmission unit 200, And a monitor 400 for receiving and imaging the captured video signal transmitted from the receiving unit 300. [

The transmission unit 200 includes an image signal processing unit 210 for acquiring an ES image signal of the CCTV 100 and an A / D (analog-digital) image signal obtained from the image signal processing unit 210. [ An encoder 220 for converting the converted digital video signal into a digital video signal and converting the converted digital video signal to an MPEG signal, and a controller 220 for inputting the position / pattern information of the I frame to the MPEG signal converted by the encoder 200, An I frame position / pattern information input unit 230 for converting the position / pattern information of the I frame input from the I frame position / pattern information input unit 230 to an MPEG An I frame position processing unit 240 for detecting an I frame position based on a signal and changing the position of the I frame according to a constant value output from the I frame and converting the position of the I frame to an MPEG signal whose position is changed, A packetizer 250 for packetizing an MPEG signal having a changed position of an I frame converted by the position processor 240 into a TS signal by TS (Transfer Stream) format and a packetizer 250 for packet- A null packet position / pattern information input unit 260 for inputting null packet position / pattern information to the tied TS signal and converting the null packet position / pattern information into the inputted TS signal, A null frame position is detected based on the TS signal in which the position / pattern information of the null packet input from the input unit 260 is input, and the position information of the I frame is inserted into the null packet of the detected null frame to generate I A null packet inserting unit 270 for converting the position information of the frame into a TS signal into which the position information of the frame is inserted; To the receiving unit 300 For it consists of a transfer unit 280. The

The I frame position / pattern information input unit 230 includes an I frame position information input unit 231 for inputting I frame position information by an external input means (e.g., a keyboard) And an I frame pattern information input unit 232 for inputting pattern information.

The I frame position processing unit 240 includes an I frame position determination unit 241 for detecting the position of the I frame signal, a I frame position determination unit 241 for determining the position of the I frame signal detected by the I frame position determination unit 241, A memory 242 for storing a number of GOPs (group of pictures, one I frame and a plurality of B frames and P frames), and a memory 242 for storing the I And an I frame position changing unit 243 for randomly changing the position of the I frame according to a constant value output from the frame position information inputting unit 231 and the I frame pattern information inputting unit 232. [

The null packet position / pattern information input unit 260 includes a null packet position information input unit 261 for inputting null packet position information by an external input unit and a null packet position information input unit 261 for inputting null packet pattern information by an external input unit. And a packet pattern information input unit 262.

The null packet inserter 270 includes a null frame position determiner 271 for detecting the position of a null frame signal and a null value determiner 272 for determining a value designated by the null packet position information input unit 261 and the null packet pattern information input unit 262 And a null packet position / pattern information inserting unit 272 for inserting null packet position / pattern information into a null packet of a null frame.

The receiving unit 300 receives the null packet position / pattern information in the TS signal in which the position information of the I frame is inserted into the null packet of the null frame transmitted from the transmitting unit 280 of the transmitting unit 200, A null packet position / pattern information input unit 310 for converting a position / pattern information of a null packet input from the null packet position / pattern information input unit 310 to a TS A null frame information processing unit 320 for determining null packet position / pattern information based on a signal and for obtaining null frame information and converting the position / pattern information of a null frame of a null frame into a TS signal obtained; A depacketizer 330 for depacketizing a TS signal obtained by converting position / pattern information of a null packet of a null frame converted by the processor 320 and converting the TS signal into an MPEG signal; ) To the converted MPEG signal An I frame position / pattern information input unit 340 for inputting the position / pattern information of the frame and converting the position / pattern information of the I frame into the inputted MPEG signal, and an I frame position / pattern information input unit 340 for inputting the position / The I frame position is detected based on the MPEG signal into which the position / pattern information of the I frame is input, and the position of the I frame is recovered according to a constant value that is output as randomized to convert the position of the I frame into the restored MPEG signal An I frame information processing unit 350 for converting an I frame of the I frame into an analog video signal by D / A (digital-analog) the MPEG signal whose position is converted by the I frame information processing unit 350, A decoder 360 for converting a video signal into an MPEG signal and an image signal processor 370 for obtaining an ES video signal from the MPEG signal converted by the decoder 360. Here, the ES video signal obtained by the video signal processing unit 370 is transmitted to the monitor 400, and the image photographed by the CCTV 100 is reproduced.

The null packet position / pattern information input unit 310 includes a null packet position information input unit 311 for inputting null packet position information by an external input unit and a null packet position information input unit 311 for inputting null packet pattern information by an external input unit. And a packet pattern information input unit 312.

The null frame information processing unit 320 determines null packet position / pattern information based on the null packet position / pattern information input from the null packet position information input unit 311 and the null packet pattern information input unit 312 And a null packet information for obtaining null packet information based on the null packet location / pattern information determined by the determination unit 321. The null packet location / And an acquisition unit 322. [

The I frame position / pattern information input unit 340 includes an I frame position information input unit 341 for inputting I frame position information by external input means and an I frame position information input unit 341 for inputting I frame pattern information by external input means. And a frame pattern information input unit 342.

In addition, the I frame information processing unit 350 is configured to determine I frame position / pattern information based on the I frame position / pattern information input from the I frame position information input unit 341 and the I frame pattern information input unit 342 A memory unit 352 for storing a predetermined number of GOPs corresponding to the I frame position / pattern information determined by the I frame position / pattern information determination unit 351, And an I frame position restoring unit 353 for restoring the position of the I frame in a predetermined number of GOPs stored in the memory unit 352. [

Meanwhile, the position information of the I frame among the information input by the external input means is firstly inputted with a random number value of 2n, and then a certain pattern value is added to the inputted random number value to generate the position information of the final I frame do. Here, the pattern value has a value of 2n.

For example, if the pattern value changes in real time as shown in Table 1 below and the inputted random number value is 92,

29 57 38 59 17 51 ... 29 57 38

The position information of the I frame will change as shown in Table 2 below.

29 57 38 59 17 51 ... 29 57 38 92 92 92 92 92 92 ... 92 92 92 121 149 130 151 109 143 ... 121 149 130

In addition, the position information of the I frame in the null frame is also performed in the above manner.

Therefore, the position information of the I frame is an unknown structure if the pattern value and the input random number value are not known.

The image encoding system using the null frame according to the present invention can decode only the position information of the I frame in the null packet of the null frame by knowing precisely the image information, so it is difficult to hack the image information.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various changes, modifications or adjustments to the example will be possible. Therefore, the scope of protection of the present invention should be construed as including all changes, modifications, and adjustments that fall within the spirit of the technical idea of the present invention.

100: CCTV 200:
210, 370: video signal processing unit 220: encoder
230, 340: I frame position / pattern information input section
231, 341: I frame position information input unit
232, 342: I frame pattern information input unit
240: I frame position processing section 241: I frame position determining section
242, 352: memory section 243: I frame position changing section
250: Packetizer
260, 310: null packet location / pattern information input unit
261, 311: null packet position information input unit
262, 312: null packet pattern information input unit
270: Null Packet Insertion Unit 271: Null Frame Position Determination Unit
272: null packet position / pattern information inserting unit 280:
300: Receiver 320: Null frame information processor
321: null packet position / pattern information determination unit 322: null packet information acquisition unit
330: Depacketizer 350: I frame information processor
351 I frame position / pattern information determination unit 353 I frame position restoration unit
360: decoder 400: monitor

Claims (11)

A CCTV 100 for capturing an image and converting the captured image into an ES (Element Stream) video signal and transmitting the same;
A transmitter 200 for receiving and encrypting the ES video signal transmitted from the CCTV 100 and transmitting the encrypted video signal;
A receiver 300 for receiving and decoding the encrypted video signal transmitted from the transmitter 200 and transmitting the decoded video signal; And
And a monitor 400 for receiving and imaging the decoded video signal transmitted from the receiver 300;
If a certain value to be randomized and outputted in the transmitter 200 is designated, the position information of the I frame is modulated and packetized, and the position information of the I frame is inserted into the null packet of the null frame, And the position information of the I frame of the frame is changed.
The method according to claim 1,
The transmitting unit 200 transmits,
An image signal processing unit 210 for obtaining an ES video signal of the CCTV 100;
An encoder 220 for A / D (analog-digital) the ES video signal obtained by the video signal processor 210 to convert the ES video signal into a digital video signal and converting the converted digital video signal to an MPEG signal;
An I frame position / pattern information input unit 230 for inputting position / pattern information of an I frame to the MPEG signal converted by the encoder 220 and converting the position / pattern information of I frame into an MPEG signal inputted;
The I frame position / pattern information input unit 230 detects the I frame position based on the MPEG signal inputted with the position / pattern information of the I frame input from the I frame position / pattern information input unit 230 and changes the position of the I frame according to a constant value An I frame position processing unit 240 for converting an I frame to an MPEG signal whose position is changed;
A packetizer 250 for formatting an MPEG signal having a changed position of an I frame converted by the I frame position processor 240 into a TS (Transport Stream) format and packetizing the converted MPEG signal into a TS signal;
A null packet position / pattern information input unit 260 for inputting null packet position / pattern information to the packetized TS signal in the packetizer 250 and converting the null packet position / pattern information into a TS signal to which null / Wow;
The null packet position / pattern information input unit 260 detects the null frame position based on the TS signal inputted with the position / pattern information of the null packet and inserts the position information of the I frame into the null packet of the detected null frame A null packet inserting unit 270 for converting a null packet of a null frame into a TS signal in which position information of an I frame is inserted; And
And a transmitting unit (280) for transmitting the TS signal into which the position information of the I frame is inserted in the null packet of the null frame converted by the null packet inserting unit (270) to the receiving unit (300) Image Encryption System using.
The method of claim 2,
The I frame position / pattern information input unit 230 includes an I frame position information input unit 231 for inputting I frame position information by external input means; And
And an I frame pattern information input unit (232) for inputting I frame pattern information by the external input unit.
The method of claim 2,
The I frame position processor 240 includes an I frame position determiner 241 for detecting the position of an I frame signal;
A memory unit (not shown) for storing a predetermined number of GOPs (group of pictures, one I frame and a plurality of B frames and P frames) corresponding to the position of the I frame signal detected by the I frame position determination unit 241 (242); And
The I frame position information input unit 231 and the I frame pattern information input unit 232 randomly change the position of the I frame in accordance with a constant value that is randomized and output in a predetermined number of GOPs stored in the memory unit 242 And an I frame position changing unit (243) for changing the I frame position.
The method of claim 2,
The null packet position / pattern information input unit 260 includes a null packet position information input unit 261 for inputting null packet position information by external input means; And
And a null packet pattern information input unit (262) for inputting null packet pattern information by the external input unit.
The method of claim 2,
The null packet inserter 270 includes a null frame position determiner 271 for detecting the position of a null frame signal; And
A null packet position / pattern information inserting unit 272 for inserting null packet position / pattern information into a null packet of a null frame at a value specified by the null packet position information input unit 261 and the null packet pattern information input unit 262 And the image is encrypted by using the null frame.
The method according to claim 1,
The receiving unit 300,
The null packet position / pattern information is input to the TS signal in which the position information of the I frame is inserted into the null packet of the null frame transmitted from the transmitting unit 280 of the transmitting unit 200, A null packet location / pattern information input unit 310 for converting the signal into a signal;
The null packet position / pattern information input by the null packet position / pattern information input unit 310 determines null packet position / pattern information based on the TS signal into which the position / pattern information of the null packet is input, obtains null frame information, A null frame information processing unit 320 for converting the pattern information into the TS signal obtained;
A depacketizer 330 for depacketizing a TS signal obtained from the position / pattern information of a null packet of a null frame converted by the null frame information processor 320 and converting the TS signal into an MPEG signal;
An I frame position / pattern information input unit 340 for inputting the position / pattern information of the I frame to the MPEG signal converted by the depacketizer 330 and converting the position / pattern information of the I frame into the inputted MPEG signal, Wow;
The I frame position / pattern information input unit 340 detects the I frame position based on the MPEG signal inputted with the position / pattern information of the I frame inputted thereto, and restores the position of the I frame according to the constant value outputted An I frame information processing unit 350 for converting an I frame position into an MPEG signal restored;
A decoder (D / A) for converting the MPEG signal from which the position of the I frame converted by the I frame information processing unit 350 is reconstructed into an analog video signal and converting the converted analog video signal into an MPEG signal 360); And
And an image signal processing unit (370) for obtaining an ES image signal from the MPEG signal converted by the decoder (360).
The method of claim 7,
The null packet position / pattern information input unit 310 includes a null packet position information input unit 311 for inputting null packet position information by an external input unit; And
And a null packet pattern information input unit (312) for inputting null packet pattern information by the external input unit.
The method of claim 7,
The null frame information processing unit 320 determines null packet position / pattern information based on the null packet position / pattern information input from the null packet position information input unit 311 and the null packet pattern information input unit 312 A null packet location / pattern information determination unit 321; And
And a null packet information obtaining unit (322) for obtaining null packet information based on the null packet position / pattern information determined by the determining unit (321) based on the null packet position / pattern information. Image Encryption System.
The method of claim 7,
The I frame position / pattern information input unit 340 includes an I frame position information input unit 341 for inputting I frame position information by an external input means; And
And an I frame pattern information input unit (342) for inputting I frame pattern information by the external input unit.
The method of claim 7,
The I frame information processing unit 350 generates I frame information for determining I frame position / pattern information based on the I frame position / pattern information input from the I frame position information input unit 341 and the I frame pattern information input unit 342, A memory unit 352 for storing a predetermined number of GOPs corresponding to the I frame position / pattern information determined by the I frame position / pattern information determination unit 351; And
And an I frame position restoring unit (353) for restoring the position of the I frame in a predetermined number of GOPs stored in the memory unit (352).

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