KR102012037B1 - Transcoding and encryption transmission device of video and audio data of IP based CCTV camera - Google Patents

Abstract

The present invention relates to a transcoding and encrypted transmission processing device of image and voice data of an IP-based CCTV camera, which comprises: a camera unit having at least one IP camera; at least one compression/encryption device (TECT device) equipped with a compression and encryption module; a TECT management server equipped with a decoding module; and a TECT management SW managing a plurality of TECT devices. According to the present invention, the data capacity can be reduced by increasing the compression efficiency.

Description

IP based CCTV camera Transcoding and encryption transmission device of video and audio data of IP based CCTV camera

The present invention relates to transcoding and encryption of IP camera video and audio data in a CCTV system. More particularly, the present invention relates to IP camera video and audio data in a CCTV system. The video data of the IP camera is HEVC transcoded and HEVC compressed by a compression / encryption device (TECT device, transcoding box) connected to the IP camera of the AES symmetric key algorithm (AES 128, 192, 256 bit). IP-based CCTV camera video, which encrypts the voice data and transmits the HEVC stream / voice data to a remote video storage and distribution server (NVR server or VMS server) through a decryption module of a decryption server on a TCP / RTSP channel. And a transcoding and encryption transmission processing apparatus (TECT) of voice data.

Recently, CCTV installations are increasing for video surveillance and security such as government, public institutions, and national and public institutions, and CCTV systems including IP cameras and NVR servers or VMS servers are increasing, and more than 4 million CCTVs nationwide. Is installed and running.

CCTV (Closed Circuit Television) system is a DVR (Digital Video Recorder) or NVR (Network Video Recorder) that compresses and stores the video data of each camera by connecting at least one camera and at least one camera and a UTP cable. ), And a storage device connected to DVR or NVR. It is used as a remote monitoring system through the multi-viewer video and audio of each camera channel to a PC through a network.

The camera includes a lens, a camera and a power supply, and has a dome or top cover camera housing that covers it, and is classified into a fixed camera and a rotating camera.

CCTV cameras include fixed cameras, dome cameras that can rotate up, down, left and right inside small cameras, pan tilt zoom (PTZ) cameras, and dome infrared (IR) cameras equipped with infrared LEDs suitable for night shots. Used.

PTZ (Pan, Tilt, Zoom) camera has PTZ control function, Pan fixes the camera position and moves the camera left and right, Tilt (tilt up, tilt down) moves the camera up and down, Zoom In / out provides a function to reduce / enlarge the video screen by focusing the focal length of the camera at a near or far distance.

DVR (Digital Video Recorder) is used as analog video control solution, and it needs a device to convert analog camera video signal to digital camera video signal, and it is hard to encode video recorded by multiple cameras connected by cable within 1.8km. It is a digital image storage device that compresses and stores on a disk and distributes and displays an image for each camera channel. It is a system that integrates a screen changeover switch, a screen splitter, a VCR (video player) sensor and an alarm controller separately included in an analog system.

1 is a CCTV system configuration having an IP camera and an NVR server or a VMS server and storage.

CCTV systems use either ONVIF or RTSP protocol.

CCTV systems using IP cameras use NVR servers or VMS servers as digital video control solutions for control centers, with RAID storage, and full HD up to 64 channel IP cameras (1/4/9/16/32/64). Real-time recorded video can be saved and distributed.

NVR (Network Video Recorder) is a dedicated PC server for video recording, monitoring, event management, and monitoring of IP cameras installed on the network. Used.

The VMS (Video Management System) server is used as a digital video control solution for monitoring and managing digital video data from multiple IP cameras in IP video security, with RAID storage, and full HD up to 64 channel IP cameras (1/4). / 9/16/32/64) can store and distribute real-time recorded video.

2 is a view showing a video data processing process (session management and control, compression, network transmission, restoration and playback) of a general video surveillance system.

CCTV cameras provide encoding and session management control of video data captured by the camera, and the server in the control center connected to the communication interface provides camera channel through session management and control, video storage and video data decoding and video playback by camera channel. Provides video monitoring service for each star.

Current CCTV systems encode high-definition video data at 30 frames per second and store them on network transmissions, NVR servers, or VMS servers. SSL ciphers designed for data channel security can add burden to the CCTV and server, such as reduced processing speed and reduced bandwidth. Because it can. Therefore, it is necessary to introduce an atypical encryption / decryption solution capable of encrypting / decrypting high-resolution CCTV camera video and audio data without low-performance server.

As a related art 1, Patent Publication No. 10-2006-0033768 discloses a device for encrypting / decrypting a camera and a method of controlling the same.

An encryption / decryption apparatus for a camera and a control method thereof include: an encryption camera that photographs and encrypts an image; An encryption receiver configured to receive and decrypt encrypted image data photographed by the encryption camera through a wired or wireless network; It includes an output unit for outputting the video data decrypted by the encryption receiving unit,

The video captured by the camera is encrypted and transmitted in real time, and the receiver decrypts the encrypted video to maintain security during communication of the image data.

A CCD 102 for taking an image; A digital signal processor (DSP) 104 which digitally processes the image photographed by the CCD 102; An encryption unit (110) for encrypting the image data digitally processed by the DSP (104); And a transmitter 106 for transmitting the image data encrypted by the encryption unit 110 to the wired / wireless network 200.

An encryption apparatus of a camera according to an embodiment includes a CCD (102) for capturing an image, as shown in FIG. A DSP (104) for digital signal processing the image captured by the CCD (102); An encryption unit (110) for encrypting the image data digitally processed by the DSP (104); And a transmitter 106 for transmitting the image data encrypted by the encryption unit 110 to the wired / wireless network 200.

The encryption apparatus of the camera comprises: an encryption unit including an FPGA 130 to encrypt image data photographed by the CCD 102; A signal modulator connected to the FPGA 130 and including a decoder 120 and a DAC 150 to perform signal modulation of image data; The peripheral part is connected to the FPGA 130 or the signal modulator and includes a memory 140 for a buffer and a microprocessor 160.

The encryption unit includes: a decoder 120 for decoding an input analog signal and converting the input analog signal into a digital signal; A Field Programmable Gate Array (FPGA) 130 for receiving a digital signal or receiving and encrypting the digital signal converted by the decoder 120; A memory 140 connected to the FPGA 140 to store data; A digital-to-analog converter (DAC) 150 for converting the encrypted digital signal output from the FPGA 130 into an analog signal and outputting the analog signal to the transmitter 106; A microprocessor (160) for controlling operations of the decoder (120), the FPGA (130), and the memory (140); It is configured to include an initialization unit 170 for controlling the initialization operation of the FPGA (130).

The FPGA 130 includes: a Receive Interface (Rx I / F) 131 which receives a digital signal or receives and decodes the digital signal decoded by the decoder 120; An encryption unit 132 for encrypting image data received through the reception interface unit 131; A communication processor 133 which performs a communication process for transmission of image data encrypted by the encryption unit 132; A transmission interface (Tx I / F) 134 for interfacing to transmit the encrypted image data in the encryption unit 132 according to the processing in the communication processing unit 133; A memory unit 135 for storing data necessary for encryption in the encryption unit 132; A key processing unit (136) for performing key processing for encryption in the encryption unit (132); And an Inter Integrated Circuit (I2C) 137 that communicates with the microprocessor 160.

The encryption unit 132 performs blowfish encryption.

The communication processor 133 may include one or more of a synchronization (Sync) generation function, a synchronization recognition function, an ECC function of key related control data, a packet configuration function, and an image frame configuration function.

The communication processor 133 may include a packetizer configured to packetize data encrypted by the encryption unit 132; The packetization unit includes an ECC unit that provides an ECC (Error Correcting Code) function when configuring a header.

The packetizer includes a packet including one or more of a sync pattern, a module ID, a sequence ID, a sequence number, a line number, a field, and a split number. Configures the header of the.

The packetizing unit configures the control data with one or more of a module ID, a sequence ID, a line number, a field, and a split number except for a sync pattern among the control data, and the control data is an ECC (Error Correcting Code). Process.

Currently, CCTV systems use most resources to encode high-definition video data at 30 frames per second, store them on network transmissions, NVR servers or VMS servers, and SSL ciphers designed for data channel security reduce processing speed and bandwidth to CCTV and servers. This is because the burden can be increased. Therefore, it is necessary to introduce an atypical encryption solution capable of encrypting / decrypting high resolution CCTV camera video and audio data without low performance of the server, and to control the compression encryption device at the control center.

In recent years, video cameras and VoIP-based voice data of IP cameras have become larger in CCTV systems, and high-cost infrastructure is needed to protect such laws and regulations when the security and encryption of camera images become mandatory. It is not easy to apply it because of the high cost of maintaining expensive leased lines.

It is necessary to apply encryption of high resolution large-capacity video and audio data to encrypt / decrypt transmission of video and audio data of a camera in a CCTV system, and network transmission traffic increases according to the increase of large-capacity video and audio data. The reality is that the encryption / decryption itself is often reluctant to be overloaded by network overload.

 In addition, security equipment such as VoIP emergency bell (VoIP emergency bell) is being installed along with CCTV system installation. Audio packet transmission used in Voice over IP (VoIP) communication uses a real-time transport protocol (RTP) protocol. However, for encrypted VoIP communication, SRTP (Secured RTP) protocol should be used. International standard for security of VoIP communication mainly uses AES 128bit Key method.

Most CCTV systems using IP cameras are equipped with SSL (Socket Secure Layer) modules for encrypted video transmission, but they are rarely used in practice.

Patent Publication No. 10-2006-0033768 (published April 19, 2006), "Encryption / decryption apparatus and control method of the camera", B & B Solutions

An object of the present invention for solving the above problems is a compression / encryption device (TECT equipment, which is connected to a plurality of IP cameras to reduce the capacity of the data to increase the compression efficiency of IP camera video and audio data in a CCTV system with a highly efficient codec, HEVC transcoding and HEVC compressed video data from the IP camera by AES symmetric key algorithm (AES 128, 192, 256 bit), and audio data to encrypt HEVC stream / audio data. Transcoding and encryption transmission processing apparatus (TECT) of IP based CCTV camera video and audio data transmitted to a remote video storage and distribution server (NVR server or VMS server) through a decryption module of a decryption server on a TCP / RTSP channel. To provide.

In order to achieve the object of the present invention, IP-based CCTV camera image and audio data transcoding and encryption transmission processing apparatus, in the CCTV system, at least one or more IP camera camera unit; At least one compression / encryption device (TECT device) equipped with a compression encryption module for compressing image data of the IP camera by HEVC transcoding, encrypting by symmetric key algorithm, and encrypting voice data; And a decryption module for decrypting the video and audio data encrypted by the compression encryption module, receiving HEVC video stream packets, decoding video and / or audio data, decoding HEVC decoding / audio data of video data, A TECT management server for reproducing to a monitoring client of a PC; And a processing device connected to the TECT management server for transcoding and encrypting an IP-based CCTV camera video and audio data including a TECT management SW managing a plurality of TECT devices.
At least one compression / encryption device (TECT device) equipped with a compression encryption module is HEVC transcoding the image data of the IP camera and the HEVC compressed image by the AES symmetric key algorithm (AES 128, 192, 256 bit) Encrypting and encrypting voice data to transmit the encrypted HEVC stream / voice data to the TECT management server on a UDP or TCP / RTSP channel,
The compression / encryption device (TECT device) when transmitting encrypted data in units of blocks by UDP or TCP / RTSP,
[1] The TECT Management S / W transmits a streaming request through the network to the compression / encryption device (TECT device) through the TECT management server, and the compression / encryption device (TECT device) is at least one. Receives the above IP camera video data, additionally receives voice data of the VoIP emergency bell with a microphone,
[2] The compression / encryption device (TECT device) receives a streaming request from the TECT management server, and in response to the response, the response message (Response) from the compression / encryption device (TECT device) to the TECT management server. / ACK),
[3] In response to a streaming request from the TECT management server, the compression / encryption device (TECT device) generates a transcoding process from the AVC codec to the HEVC codec, outputs the HEVC stream to a given RTSP session (rtsp: / /adc.def:1234),
[4] If the compression / encryption device (TECT device) encrypts image data, the compression / encryption device (TECT device) encrypts the image data and then converts the HEVC stream into a UDP or TCP / RTSP channel. Sent over the air,
If the compression / encryption device (TECT device) has a video and / or voice encryption option set, the compression / encryption device (TECT device) encrypts the video and / or audio data, and then the HEVC stream and / or the audio data. Send on a UDP or TCP / RTSP channel.

IP-based CCTV camera image and audio data transcoding and encryption transmission processing device (TECT) according to the present invention a number of high-performance codec to reduce the capacity of the data to increase the compression efficiency of the IP camera image and audio data in a CCTV system The video data of the IP camera is HEVC transcoded and HEVC compressed by a compression / encryption device (TECT device, transcoding box) connected to the IP camera of the AES symmetric key algorithm (AES 128, 192, 256 bit). And encrypts the voice data and transmits the HEVC stream / voice data to a remote video storage and distribution server (NVR server or VMS server) through a decryption module of the decryption server on a UDP or TCP / RTSP channel.

1 is a CCTV system configuration having an IP camera and an NVR server or a VMS server and storage.
2 is a view showing a video data processing process (session management and control, compression, network transmission, restoration and playback) of a general video surveillance system.
3A is a configuration diagram of a compression / encryption server, a decryption module, an image storage and distribution server (NVR server or VMS server), and a monitoring client for IP camera image data encryption / decryption in a CCTV system according to a first embodiment of the present invention; to be.
3B is a compression / encryption server, decryption module, image storage and distribution server (NVR server or VMS server) for encrypting / decrypting video and audio data applied to CCTV camera and VoIP emergency bell according to a second embodiment of the present invention. And configuration diagram of the monitoring client.
3C is a block diagram of CCTV data compression / encryption.
4A and 4B illustrate HEVC transcoding and AES symmetric key algorithms (AES 128, 192,) of image data of an IP camera by n compression / encryption devices (TECT, transcoding boxes) connected to n IP cameras in a CCTV system. This is a service flow showing the step of transmitting encrypted data by encrypting by block using 256 bits).
5 and 6 are diagrams illustrating a process in which a compression / encryption device (TECT, transcoding box) delivers an encrypted video / audio packet to a TECT management server through a network when an encryption option is selected in a CCTV system. to be.
7A is a login screen of a TECT management SW (TECT management SW) connected to a TECT management server, and FIG. 7B is a user management screen for registering a login and an Admin account of the TECT management SW.
8 is a screen illustrating a device management screen UI / UX configuration and function of the TECT management SW.
9 is a screen illustrating the configuration and function of the environment setting screen UI / UX of the TECT management SW.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail the configuration and operation of the invention.

The IP-based CCTV camera image and audio data transcoding and encryption transmission processing device (TECT equipment, Transcoding and Encryption Composite Tool, transcoding box) is compressed in the CCTV system IP camera image and audio data with a highly efficient codec AES symmetric key algorithm converts HEVC transcoding and HEVC compressed video data from IP cameras by compression / encryption devices (TECT equipment, transcoding boxes) that are connected to multiple IP cameras to increase efficiency and reduce data capacity. Encrypted by (AES 128, 192, 256 bit), encrypted voice data, and encrypted HEVC stream / voice data over UDP or TCP / RTSP channel by TECT management server [decoding module for remote video storage and distribution server (NVR) Server or VMS server)].

IP-based CCTV cameras Compression / encryption devices (TECT equipment, transcoding boxes) for transcoding and encrypting video and audio data are connected to multiple cameras and / or VoIP emergency bells in CCTV systems. A processing device for transcoding and encrypting transmission of camera video and audio data.

 Compression / Encryption Device (TECT Device) is a compression / encryption device (TECT device, transcoding) that is connected with multiple IP cameras to reduce the data capacity by increasing IP camera image and audio data with high efficiency codec in CCTV system. Box) HEVC transcodes the video data of the IP camera by the HEVC conversion module, encrypts the video compressed with HEVC by the encryption module using AES symmetric key algorithm (AES 128, 192, 256 bit) and Encrypts and transmits the HEVC stream / voice data to a TECT management server (including a decryption module and a remote NVR server or VMS server) on a UDP or TCP / RTSP channel.

Only for video transcoding / encryption transmission, the TECT (Trancoding and Encryption Composite Tool) creates and converts the process of transcoding IP-based CCTV video data from a common video codec (AVC codec) to the HEVC codec. The HEVC stream is output to a given RTSP session, and the video data is encrypted to transmit the HEVC stream to a TECT management server (including a decoding module and a remote NVR server or a VMS server) on a UDP or TCP / RTSP channel.

The TECT Management Server includes a decryption module of a decryption server, and may further include an NVR server or a VMS server, and is connected to n compression / encryption devices (n TECT devices) through a communication network. Provide TECT equipment management.

The TECT management server receives (1) HEVC video stream packets, (2) decoding video and / or audio data, HEVC decoding of audio data / decoding of audio data, and (3) playback with a monitoring client of a PC or smartphone. To display.

TECT management SW (TECT management SW) is connected to the TECT management server, and provides equipment management, user management, device history inquiry, environment setting screen of the compression / encryption decoding device (TECT, transcoding box).

IP-based CCTV camera video and audio data transcoding and encryption transmission processing apparatus of the present invention,

In the CCTV system, the camera unit having at least one IP camera;

An HEVC conversion module for compressing the image data of each IP camera of the camera unit by HEVC transcoding, an encryption module for encrypting the HEVC transformed video stream in block units by a symmetric key algorithm, and an additional compression for encrypting voice data At least one compression / encryption device (TECT equipment) equipped with an encryption module;

Decryption module for decoding the video and audio data encrypted by the compression encryption module is provided, receives HEVC video stream packets, decoding video and / or audio data, HEVC decoding / decoding of video data, PC Or a TECT management server to be played by the monitoring client of the smartphone; And

It is connected to the TECT management server, and includes a TECT management SW for managing a plurality of TECT equipment.

The compression / encryption apparatus (TECT device) includes an HEVC conversion module for compressing image data of the IP camera into various types of codec (AVC) image data by HEVC transcoding, and performing image processing with a minimum unit coding unit (CU); An encryption module for encrypting the HEVC transcoded stream by the HEVC conversion module in block units by a symmetric key algorithm; And a compression encryption module for encrypting voice data.

Example 1

3A is a configuration diagram of a compression / encryption server, a decryption module, an image storage and distribution server (NVR server or VMS server), and a monitoring client for IP camera image data encryption / decryption in a CCTV system according to a first embodiment of the present invention; to be.

As shown in Figs. 4A and 4B, in order to reduce the overload of the IP network, in a CCTV system, a compression / encryption apparatus (TECT, Transcoding and Encryption Composite Tool, Transcoding Box) is used for the HEVC transcoding of the image data of the IP camera. The AES symmetric key algorithm (AES 128, 192, 256 bits) is encrypted and transmitted in units of blocks and decrypted by the decryption module.

The network of CCTV system uses wired / wireless communication network, and one of wired cable (USB cable, UTP cable), Ethernet, W-LAN, Wi-Fi, NB-IoT, LTE 4G or 5G.

The block encryption and decryption system of the video and audio data of the IP camera,

In the CCTV system, each camera includes an IP camera and a microphone, the camera unit having a codec, a digital signal processor (DSP) and a communication unit;

Image data of each IP camera of the camera unit is compressed by High Efficiency Video Coding (HEVC) transcoding, encrypted by AES (Advanced Encryption Standard) symmetric key algorithm, and a compression encryption module having a compression encryption module for encrypting voice data. Encryption device (TECT #k);

A network transmitter for transmitting the video and audio data encrypted by the compression / encryption apparatus (TECT #k) to a network;

A decryption server having a decryption module for decrypting the encrypted video and audio data;

A video storage and distribution server that uses a network video recorder (NVR) server or a video management system (VMS) server, and stores and distributes decoded video and audio data; And

It includes a monitoring client that is linked with the image storage and distribution server,

Video and audio data transmitted in TCP or UDP / RTSP for the video and audio of each IP camera of the camera unit are encrypted by the compression encryption module in units of blocks and decrypted by the decryption module.

In one embodiment, an image compression encryption module may be included in one embedded system in an IP camera to which an IP address is allocated in a CCTV system.
On the other hand, in another embodiment, provided as a compression encryption module separate from the camera unit to be applied to other existing CCTV cameras installed, the video compression encryption of the newly installed CCTV camera and the existing CCTV installed Image compression encryption can be applied to IP cameras in the system.

In the CCTV system, the video storage and distribution server is an RTSP video storage and distribution server that uses an NVR server or a VMS server that supports up to 64 channels / output 128 channels for each IP camera and uses the RTSP protocol serving as an RTSP server. Full HD / HD / SD high / medium / low definition video bit streams are distributed to the monitoring center's monitoring client. The monitoring client of the control PC and the video streaming protocol of the smartphone use the RTSP protocol.

In a CCTV system, the video storage and distribution server functions as an RTSP server that transmits video stream data of a plurality of IP cameras at an output terminal.

The monitoring client of the PC of the control center performs an RTSP client function including a video decoder, requests the video bit stream of the camera on-demand to the video storage and distribution server, and sends the video of the corresponding IP camera from the video storage and distribution server. The bit stream is received and output.

Example 2

3B is a compression / encryption server, decryption module, image storage and distribution server (NVR server or VMS server) for encrypting / decrypting video and audio data applied to CCTV camera and VoIP emergency bell according to a second embodiment of the present invention. And configuration diagram of the monitoring client.

The block encryption and decryption system of the video and audio data of the IP camera,

In the CCTV system, the camera unit having at least one IP camera; A compression / encryption apparatus (TEC #k) having a compression encryption module for compressing the image data of the camera unit by HEVC transcoding, encrypting by AES algorithm, and encrypting voice data; A network transmitter for transmitting the video and audio data encrypted by the compression encryption module of the pressure / encryption apparatus to a network;

A decryption module for restoring the encrypted video and audio data;

An image storage and distribution server (NVR server or VMS server) for storing and distributing restored video and audio data in a storage device; And

And a monitoring client interworking with the video storage and distribution server and outputting restored video and audio data.

The video and audio data in the UDP payload data of the camera unit is encrypted by the compression encryption module in units of blocks and decrypted by the decryption module.

When the camera unit is embedded with an IP camera and a microphone, in a CCTV system, each camera may be embedded with an IP camera and a microphone, and may include a codec, a digital signal processor (DSP), and a communication unit.

The compression encryption module uses the AES algorithm (128,192,256 bit) for video encryption of CCTV or IP cameras, and applies encryption / decryption in units of 128,192,256 bits.

For voice encryption of microphone, it uses AES 128bit Key method or Secure RTP (SRTP) protocol, which is an international standard for security of encrypted VoIP communication.

The network uses a wired or wireless network and uses one of wired cables (USB cable, UTP cable), Ethernet, WLAN, Wi-Fi, NB-IoT, and LTE 4G / 5G.

In a CCTV system, the video storage and distribution server uses a DVR server or an NVR server.

3C is a block diagram of CCTV data compression / encryption.

For example, when the digital signal processor includes only the image signal processor when HEVC transcoding and AES encryption / decryption of the camera image,

The compression-encrypted image data is transmitted to the network through an image collection unit of a camera unit, an image data compression unit of a codec, an image encryption unit and a transmission unit.

The decryption server includes a network input port for receiving compressed encrypted image data, and an image signal processor for converting a digital signal transmitted through a network into an image signal processor; A decryption module for decrypting the compressed encrypted image data; A decoding unit of a codec for decoding the decoded video signal reconstructed by the decoding module; The video signal is transmitted through the output port of the video output unit for transmitting over the network.

The structure of packet data (Video, Voice, Text) transmitted through the network is the MAC layer, Ethernet Frame is Ethernet header, IP header, CCMP header, UDP, TCP transport protocol payload data, Ethernet trailer (Ethernet) trailer). CCMP (cryptography) is encryption protocol used in Wi-Fi.

Payload data of the UDP and TCP transport protocols includes a header, video data (User Data), and audio data (MIC), and the encryption target uses video data (User Data) and audio data (MIC audio data). Basically, in the TCP / IP protocol, TCP and UDP packets are transmitted in units of 512 bits.

The compression encryption module comprises: an image collecting unit for RTSP converting TCP or UDP packet data of an image; HEVC transcoding module for transcoding MPEG4, H.264 video by HEVC transcoding; An image encryption module for encrypting payload data (video, voice) of UDP and TCP transport protocols; And a transmission unit for transmitting the compressed encrypted image.

The HEVC conversion module converts MPEG4 and H.264 video data by HEVC transcoding. The HEVC transform module performs HEVC transcoding, sets a coding unit (CU), and performs image processing.

If the codec is not of the same type, the coding unit CU is split and the codec type is analyzed again.

If it does not have the same type of compression characteristics, it is determined whether the coding unit (CU) of the minimum unit, and if not the coding unit (CU) of the minimum unit, the coding unit (CU) is divided, and the codec compression characteristics determination process is repeated, If the coding unit (CU) of the smallest unit is set CU and image processing.

The decryption module of the decryption server

case 1) In a CCTV system, when receiving only encrypted image data of an IP camera from a compression / encryption device (TECT device), the decryption server receives a network input port for receiving compressed encrypted image data and a digital signal transmitted through a network. Image Signal Processor Image signal processor (ISP) for converting image signals; A decryption module for decrypting the compressed encrypted image data; A decoding unit of a codec for decoding the decoded video and audio data reconstructed by the decoding module; And an output port of an image output unit for transmitting video and audio data through a network.

case 2) When receiving encrypted video and audio data from a compression / encryption device (TECT device), the decryption server is a digital signal processor for receiving a digital signal transmitted through a network, a network input port for receiving compressed encrypted video and audio data. A digital signal processor (DSP) for converting the video and audio signals of the camera; A decryption module for decrypting the compressed encrypted image data; A decoding unit of a codec for decoding the decoded video and audio data reconstructed by the decoding module; And an output port of an image output unit for transmitting video and audio data through a network.

For reference, HEVC (High Efficiency Video Coding) was established as Part 2 ISO / IEC 23008-2 of the MPEG-H standard, and ITU-T Video Coding Expert Group (VCEG) and ISO / IEC MPEG JCT-VC. Next Generation for U HDTV, HDTV, and 3DTV (Joint Collaborative Team on Video Coding), established as H.265 high-efficiency video compression technology standard with twice the coding performance compared to the existing H.264 / MPEG-4 AVC compression standard Video compression technology.

It has 4 times better compression than MPEG-2, 2 times better than H.264 / MPEG-4 AVC, and 30% better performance than H.264 / MPEG-4 AVC.

HEVC is used for hierarchical coding structure by using quad tree-based coding technology, and is used for DTV, terrestrial 4K UHDTV, and HD 3DTV video coding method at 5 Mbps. For example, the conventional terrestrial HDTV broadcasting, which used to provide one channel of broadcast using MPEG-2 compression technology, can use HEVC compression technology to provide four channels of broadcast while maintaining the same picture quality.

HEVC uses variable size blocks and recursive partitioning structures from 64x64 to 8x8. In intra prediction, encoding is performed using 9 modes in the existing standard H.264 / AVC, while HEVC uses a total of 35 modes such as directional mode, DC, and plana modes. For inter-screen prediction, AMVP, Merge and other techniques are used to increase the compression performance.

HEVC encoder

Transformation, quantization: Binary representation of the image

○ Motion Prediction: Predict and transmit information on screen movements

Context-bbased Adaptive Binary Arithmetic Coding (CABAC): Experiments create a context model of each syntax element to be coded with probability and encode it

○ Merge: Reduces the amount of code transmission by sending only index information for differences between vectors

HEVC decoder

AMVP: Motion compensation using two spatial motion vectors and one temporal motion vector

○ Loop Filter: Improves image quality by removing distortion at block boundaries

The HEVC encoder generates a bitstream by compressing an image through coding tree block (CTU) unit prediction, transform, quantization, and entropy encoding.

The HEVC decoder obtains the residual signal by performing inverse quantization and inverse transformation on the non-stream received as an input using a syntax obtained through entropy decoding. The obtained residual signal forms a reconstructed image together with the prediction signal obtained in the prediction process. The reconstructed image is finally displayed on the terminal after deblocking filter and Sample Addaptive Offset (SAO).

Compared with the existing H.264 / MPEG-4 AVC compression standard, HEVC has a variable coding tree block (CTB) structure ranging from 64 × 64 to 8 × 8. For ease of use and detailed blocking, it is classified into three types of block units: a coding unit (CU), a PU (Prediction Unit), and a TU (Transform Unit). The coding unit CU is a basic compression unit, the prediction unit PU is a unit capable of performing a prediction mode, and the transformation unit TU is a unit for transformation. In order to generate prediction blocks, intra prediction and inter prediction are used similar to the existing compression standard. In order to improve the prediction performance, HEVC uses 33 directional modes and 35 modes such as DC and plane to make intra prediction.

Inter-screen prediction improves the prediction performance for complex areas. The transform part supports various transform sizes from 4 × 4 to 32 × 32, and supports DST transform for 4 × 4 intra prediction. The RDOQ technique is used to increase the quantization performance, and the RDOQ technique adjusts the value of the coefficient after quantization.

Entropy coding uses CABAC (Context-bbased Adaptive Binary Arithmetic Coding). A de-blocking filter is used to reduce an error occurring between blocks with respect to the reconstructed image, and a SAO (Sample Addaptive Offset) technique is used to generate a reconstructed image close to the original image.

The deblocking filter (DF) of HEVC checks PU and TU block boundaries in order to reduce blocking due to quantization error, and performs filtering by determining whether the filter is applied and the strength of the filter according to a predetermined condition. The deblocking filter performs horizontal filtering on all vertical edges existing in the frame, and then performs vertical filtering on all horizontal edges.

SAO of HEVC is performed on pixels in which deblocking filtering is performed in units of CTU to reduce ringing phenomenon and error between the reconstruction signal and the original signal due to quantization. SAO calculates an appropriate offset value after comparing the original video with the deblocking filter. SAO has two types of offsets: edge offset (EO) and band offset (BO). The edge offset EO selects one of four classes by determining edge directionality with surrounding pixels, and calculates and compensates respective offsets for four categories for the selected class. The band offset BO is a technique of adding an offset to a pixel value included in a corresponding band by determining an offset with respect to a band of pixel values where quantization errors occur frequently. The band offset BO divides the range of pixel values into 32 bands in total and encodes offsets for four consecutive bands.

SAO technology is an in-loop filter applied to samples with deblocking filters according to the HEVC standard. When encoding and decoding are performed on a picture basis, SAO is applied after the deblocking filter is applied to the entire picture. In this method, SAO can be applied only when the deblocking filter for the entire picture is applied.

In the current HM, a reconstructed image may be generated in picture units, and then a picture-based deblocking filter and SAO may be performed.

The HEVC decoder includes an entropy decoder, an inverse quantization, an inverse transform, a deblocking filter, and a sample add offset offset (SAO).

Conventional HEVC software usually uses a method of reconstructing an image in picture units. That is, the picture is reconstructed in picture units, the deblocking filter is applied in picture units, and SAO is applied in picture units. In addition, the image may be reconstructed in units of a CTU unit or a minimum coding unit (CU), a CTU unit or a CU deblocking filter may be applied, and an SAO may be applied in a CTU unit or a CU unit.

The block unit may use any one of a picture unit, a CTU unit, or a minimum coding unit (CU) unit.

The Advanced Encryption Standard (AES) algorithm (128,192,256 bit) is a symmetric key encryption algorithm used as the US standard adopted as a new encryption / decryption algorithm for the protection of computer data by the National Institute of Standards and Technology (NIST). . Symmetric key encryption algorithm uses the same encryption key and decryption key.

Unlike the existing DES encryption algorithm, the AES encryption algorithm does not have a Feistel Cipher, and the encryption block size uses 128, 192, or 256 bit block sizes.

Block ciphers use fixed-length ciphertext for fixed-length blocks (128bit, 192bit, 256bit). The 128-bit, 192-bit, and 256-bit block algorithms encrypt an n-bit plaintext using an encryption key to generate a ciphertext, and decrypt the ciphertext into an n-bit plain text using a decryption key.

Encryption uses cryptographic keys to convert plaintext into ciphertext.

Decryption uses cryptographic keys to convert ciphertext into plaintext.

* Advanced Encryption Standard (AES)

128-bit block size and 128-192, 256-bit public key algorithm

-AES is a non-Feitel algorithm that outputs 128-bit plain text as 128-bit cipher text.

-10, 12, 14 rounds are used, and the corresponding key size is 128, 192, 256 bits

In any case, the round key size generated from the key expansion algorithm is 128 bits of the same plaintext and ciphertext size.

<AES encryption>

DES (Data Encryption Standard) uses a basic structure called Feitel network, while Rijndael uses a Substitution-Permutation Network (SPN) structure.

Each round of the AES encryption process consists of the following operations by applying a non-linear S-box.

-SubByte () operation that performs per byte substitution,

  A ShiftRow () operation that performs a cyclic shift on a row basis,

  AddRoundKey () operation to EX-OR with a round key

-The last round of encryption does not mix MixColumns () operation.

Safe from all attack methods on AES block cipher algorithms

In an embodiment, the camera unit is basically an embedded system having a camera and a microphone and photographing and transmitting video and audio data. The camera unit is a communication unit (Wi-Fi, NB-IoT communication unit, or LTE 4G / 5G). It may be implemented as an IoT terminal having a.

In particular, in a CCTV system, a compression encryption module of a camera unit and a compression / encryption device (TECT device) includes a compression encryption module of a camera unit and a compression / encryption device (TECT device) including an IP camera and a microphone to which an IP address is assigned. Included in one embedded system, or

Separated from the camera unit, a compression encryption module of a compression / encryption device (TECT device) is used, and block compression encryption of video and audio data of an IP camera is applied.

The IP network of CCTV system uses wired / wireless communication network, and one of wired cable (USB cable, UTP cable), Ethernet, W-LAN, Wi-Fi, NB-IoT, LTE 4G and 5G.

In CCTV systems, video storage and distribution servers use NVR servers or VMS servers.

4A and 4B illustrate HEVC transcoding and AES symmetric key algorithms (AES 128, 192) of image data of an IP camera by n compression / encryption devices (TECT equipment and transcoding boxes) connected to n IP cameras in a CCTV system. , 256 bit) is a service flow showing the step of transmitting encrypted data by encrypting it.

IP-based CCTV cameras Compression / encryption decoding devices (TECT, transcoding boxes) for transcoding and encrypting video and audio data are connected to multiple cameras and / or VoIP emergency bells in CCTV systems. A processing device for HEVC transcoding and AES encrypted transmission of camera video and audio data.

Referring to FIG. 4A, a TECT Management Server (PC / Server) and a Compression / Encryption Device (TECT device) create SSL Tunnels (Open), and the TECT Management Server and the TECT device connect to a connection channel. Exchange information to create For example, after the TCP / RTSP connection of the TECT management server and the TECT device is established, the TCP / RTSP connection channel is used to exchange control messages between the TECT management server (PC / Server) and the TECT device (transcoding box). .

The TECT management server creates an RTSP client-based stream (Open). For example, an RTSP address such as rtsp: //abc.def: 1234 is used. At this time, if the TECT device (transcoding box) has a video stream encryption function selected, the corresponding TECT device (transcoding box) encrypts the HEVC transcoding stream of the video image data of the IP camera in units of blocks.

* Send encrypted data to the server in blocks by UDP or TCP / RTSP

[1] TECT Management S / W transmits streaming request (Stream Request. 1C) to compression / encryption device (TECT equipment, transcoding box) through TECT management server through network. The TECT device is connected to at least one IP camera in a CCTV system, receives at least one IP camera image data, and additionally receives voice data of a VoIP emergency bell having a microphone.

The streaming request includes (1) priority information, (2) encryption information, and (3) RTSP URL information.

[2] The compression / encryption device (TECT device) receives a streaming request (Stream Request. 1C) of the TECT management server, and in response to the response message (Response /) from the compression / encryption device (TECT device) to the TECT management server. ACK).

[3] In response to a request message from the TECT management server, the compression / encryption device (TECT device) generates a transcoding process from the video codec (AVC codec) to the HEVC codec, and outputs the HEVC stream to a given RTSP session (eg rtsp: //adc.def: 1234).

[4] If the compression / encryption device (TECT device) encrypts the image data, the compression / encryption device (TECT device) encrypts the image data, and then sends the HEVC stream on the UDP or TCP / RTSP channel. send.

If the compression / encryption device (TECT device) has a video and / or audio encryption option set, the compression / encryption device (TECT device) encrypts the video and / or audio data, and then the HEVC stream and / or the audio data. Transmit over UDP or TCP / RTSP channels.

The compression / encryption device (TECT equipment) for transcoding and encrypting IP-based CCTV camera video and audio data is designed to reduce the data capacity by increasing IP camera video and audio data with a highly efficient codec. A compression / encryption device (TECT device) connected to a plurality of IP cameras HEVC transcodes the image data of each IP camera by the HEVC conversion module, and AES symmetric key algorithm (AES) converts the image compressed by HEVC into the HEVC by the encryption module. TECT management server (decoding module and remote NVR server or VMS server) on the UDP or TCP / RTSP channel with HEVC stream / voice data encrypted by block unit by 128, 192, 256 bit) and voice data by block unit To send).

The TECT management server may include a decryption module, an NVR server, or a VMS server of the decryption server.

NVR server or VMS server, which is used as video storage and distribution server in CCTV system, stores video and audio data by camera channel in RAID storage.

In the case of video transcoding / encryption only, the TECT (Trancoding and Encryption Composite Tool) creates a process of transcoding the video data of the IP camera from the general video codec (AVC codec) to the HEVC codec, A device that outputs a HEVC stream to a given RTSP session, encrypts video data, and transmits the HEVC stream to a TECT management server (decoding module and a remote NVR server or VMS server) on a UDP or TCP / RTSP channel.

5 and 6 are diagrams illustrating a process in which a compression / encryption device (TECT, transcoding box) delivers an encrypted video / audio packet to a TECT management server through a network when an encryption option is selected in a CCTV system. to be.

IP-based CCTV camera video and audio data transcoding and encryption transmission processing device (TECT, Transcoding and Encryption Composite Tool, Transcoding Box) is a high-performance codec to improve the compression efficiency of IP camera video and audio data in CCTV system. Compression / encryption device (TECT equipment, transcoding box) connected to multiple IP cameras to HEVC transcodes the video data of each IP camera by HEVC conversion module and compresses to HEVC by encryption module. The encrypted video is encrypted in block units using AES symmetric key algorithms (AES 128, 192, 256 bits), and voice data is encrypted and transmitted.

The HEVC conversion module converts and converts various types of codec (AVC), MPEG4, and H.264 video data by HEVC transcoding, and performs image processing in a block unit, that is, a minimum unit coding unit (CU).

A compression / encryption device (TECT, transcoding box) is connected to multiple cameras and / or VoIP alarm bells in a CCTV system, and is a processing device for transcoding and encrypting IP-based CCTV camera video and audio data.

IP-based CCTV video and emergency call voice data transmitted from the remote site is compressed with high-efficiency codec to reduce the data capacity by increasing the efficiency of compression and block by block of compressed video / audio data according to HEVC transcoding It is a device that secures and transmits media data by transmission.

In the case of video transcoding / encryption transmission, the TECT equipment (Trancoding and Encryption Composite Tool) creates a process of transcoding IP-based CCTV video data from a common type of video codec (AVC codec) to the HEVC codec. The device outputs the converted HEVC stream to a given RTSP session and transmits the HEVC stream to a remote location on a UDP or TCP / RTSP channel by encrypting image data.

7A is a login screen of a TECT management SW (TECT management SW) connected to a TECT management server, and FIG. 7B is a user management screen for registering a login and an Admin account of the TECT management SW.

TECT management SW (TECT management SW) is connected to the TECT management server (TECT management server), and provides equipment management, user management, device history inquiry, configuration screen of the compression / encryption device (TECT equipment, transcoding box) .

User management works with the database of the TECT management server for account design so that users can log in and out for each user. The TECT Management SW login screen provides a screen with ID / password options, and it is an authority management, which is based on the user level, Admin (for full account registration / deletion management) and maintenance (regular n TECTs). Equipment maintenance) and monitoring (n TECT equipment monitoring if necessary).

Admin account consists of name / division / registration date / delete option.

1) User Management Department

-Acquisition of authority of CCTV system to access video management system

-The final administrator has the authority to create accounts of users by group

Management division divided into maintenance and monitoring

-The maintenance group has the authority to adjust the parameters of the TECT device, but the monitoring group can only inquire.

2) Video Management Department

-TECT equipment (transcoding box) manages at least 1 to 5 IP CAM devices.

-Calling the IP CAM set on the TECT device (transcoding box),

. Supports control tab function to select transmission image quality (up / mid / down) dynamically

. Supports control tab function to select encryption / decryption function

. Encryption supports AES 128,192,256 bit

. Supports control tap function to select bit rate

8 is a screen illustrating a device management screen UI / UX configuration and function of the TECT management SW.

TECT management SW's equipment management is applied to all installed TECT equipments, and the compression / encryption device (TECT equipment, transcoding box) installation location, multiple CAM IDs, CAM NAMEs connected to TECT equipment, transmission quality (up / mid / The total CPU usage of TECT equipment (PC), network load (usage vs network connection speed), video / audio encryption algorithm (ARIA, AES 128, AES 256), CAM IP address and port number, and Stream URL Is displayed.

The device management screen of the TECT management SW displays the location of the TECT device installation, the number of CAM IDs connected to the TECT device, CAM NAME, transmission quality (up / mid / down), and the total usage of the CPU of the TECT device (PC) The load (usage versus network connection speed) is displayed.

In the TECT management SW, the corresponding camera image pops up when the Stream URL is clicked.

TECT management SW displays original video and transcoding information, and displays all camera-specific information when multiple IP cameras are allocated to one TECT device.

On the user-specific Active / Standby / Fail page, the transcoding and encryption operations are assigned to the TECT device assigned to the active click. In case of failure of IP camera, it is changed to standby mode and the IP camera which is actually operated is allocated by management.

9 is a screen illustrating the configuration and function of the environment setting screen UI / UX of the TECT management SW.

Configuration of TECT management SW provides the function of adding / deleting compression / encryption device (TECT, transcoding box), setting column and order to be displayed on Active / Stanby / Fail page per user.

Embodiments according to the present invention can be implemented in the form of program instructions that can be executed by various computer means can be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Computer-readable recording media include storage media, magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions may include high-level language code that is generated by a compiler and may be executed by a computer using an interpreter as well as machine code. The hardware device may be configured to operate as one or more software modules to perform the operations of the present invention.

As described above, the method of the present invention is implemented as a program, which can be read using software of a computer, such as a recording medium (CD-ROM, RAM, ROM, memory card, hard disk, magneto-optical disk, storage device, etc.). ) Can be stored.

Although described with reference to a preferred embodiment of the present invention, various modifications or variations of the present invention without departing from the spirit and scope of the invention described in the claims to those skilled in the art It will be understood that it can be carried out by.

TECT: Transcoding and Encryption Composite Tool
HEVC: High Efficiency Video Coding
AES: Advanced Encryption Standard

Claims (13)

In the CCTV system, the camera unit having at least one IP camera;
At least one compression / encryption device (TECT device) equipped with a compression encryption module for compressing image data of the IP camera by HEVC transcoding, encrypting by symmetric key algorithm, and additionally encrypting voice data;
Decryption module for decoding the video and audio data encrypted by the compression encryption module is provided, receives HEVC video stream packets, decoding video and / or audio data, HEVC decoding / decoding of video data, PC A TECT management server to be played by a monitoring client of the device; And
It is connected to the TECT management server, and includes a TECT management SW for managing a plurality of TECT equipment,
At least one compression / encryption device (TECT device) equipped with a compression encryption module is HEVC transcoding the image data of the IP camera and the HEVC compressed image by the AES symmetric key algorithm (AES 128, 192, 256 bit) Encrypting and encrypting voice data to transmit the encrypted HEVC stream / voice data to the TECT management server on a UDP or TCP / RTSP channel,
When the compression / encryption device (TECT device) transmits encrypted data in units of blocks by UDP or TCP / RTSP, [1] TECT Management S / W manages the TECT through a network. The server transmits the compression / encryption device (TECT device) through a server, and the compression / encryption device (TECT device) receives at least one or more IP camera image data, and additionally receives voice data of a VoIP emergency bell including a microphone. ,
[2] The compression / encryption device (TECT device) receives a streaming request from the TECT management server, and in response to the response, the response message (Response) from the compression / encryption device (TECT device) to the TECT management server. / ACK),
[3] In response to a streaming request from the TECT management server, the compression / encryption device (TECT device) generates a transcoding process from the AVC codec to the HEVC codec, outputs the HEVC stream to a given RTSP session (rtsp: / /adc.def:1234),
[4] If the compression / encryption device (TECT device) encrypts image data, the compression / encryption device (TECT device) encrypts the image data and then converts the HEVC stream into a UDP or TCP / RTSP channel. Sent by
If the compression / encryption device (TECT device) has a video and / or voice encryption option set, the compression / encryption device (TECT device) encrypts the video and / or audio data, and then the HEVC stream and / or the audio data. A processing device for transcoding and encrypting IP-based CCTV camera video and audio data, which is transmitted over a UDP or TCP / RTSP channel. The method of claim 1,
Video and / or audio data of TCP or UDP data transmitted to RTSP with respect to the video and audio of each IP camera of the camera unit by block HEVC conversion module of the compression / encryption apparatus (TECT equipment). HEVC transcodes the video data of the camera, is encrypted and transmitted by the compression encryption module,
Processing apparatus for transcoding and encrypting transmission of IP-based CCTV camera video and audio data, which is decrypted by the decryption module. The method of claim 1,
The TECT management server includes the decoding module, and may further include an NVR server or a VMS server as an image storage and distribution server.
An IP based CCTV camera video and audio data transcoding and encryption transmission processing device connected to a communication network with n compression / encryption devices (n TECT devices) and providing TECT device management. The method of claim 1,
The TECT management server and the compression / encryption device (TECT device) generate (Open) SSL Tunnels, and after establishing a TCP / RTSP connection between the TECT management server and the TECT device to establish a connection channel, a TCP / RTSP connection The channel is used to exchange control messages between the TECT management server and the TECT devices,
The TECT management server creates an RTSP client-based stream (Open), for example, an RTSP address such as rtsp: //abc.def: 1234 is used, and the TECT device is selected by a video stream encryption function. If so, the TECT device encrypts and transmits the HEVC transcoding stream of the video data of the IP camera in units of blocks. delete The method of claim 1,
The streaming request includes (1) priority information, (2) encryption information, and (3) RTSP URL information. IP-based CCTV camera image and audio data transcoding and encryption transmission processing apparatus. The method of claim 1,
The compression encryption module of the compression / encryption device (TECT equipment) uses an 128,192,256 bit AES algorithm for video encryption of a CCTV or IP camera, and encrypts / decrypts 128, 192, and 256 bit blocks. Apparatus for transcoding and encrypting transmission of video and audio data. The method of claim 1,
The compression encryption module of the compression / encryption device (TECT equipment)
Transcoding and encryption transmission apparatus for IP-based CCTV camera video and audio data using AES 128bit Key or SRTP (Secure RTP) protocol for encrypting voice data of a microphone for encrypted VoIP communication. The method of claim 1,
The TECT management SW is connected to the TECT management server, and provides device management, user management, device history inquiry, and environment setting screen of a plurality of compression / decryption decoding devices (TECT device and transcoding box).
It is linked with the database of the TECT management server, provides a user management ID / password screen, and manages (registration / registration / deletion of entire account) and maintenance (regular access) for access control according to the user's level by authority management. IP based CCTV camera consisting of screens with n TECT device maintenance) and monitoring (n TECT device monitoring if necessary) options, and the Admin account consists of name / division / registration date / delete options. Apparatus for transcoding and encrypting transmission of video and audio data. The method of claim 9,
The device management of the TECT management SW is applied to all installed TECT devices collectively, and the installation location of compression / encryption device (TECT device, transcoding box), multiple CAM IDs, CAM NAMEs, and transmission image quality (high / medium) , Total CPU usage of TECT equipment (PC), network load (usage versus network connection speed), video / audio encryption algorithm (ARIA, AES 128, AES 256), CAM IP address and port number, Stream URL This is an IP-based CCTV camera video and audio data transcoding and encryption transmission processing device. The method of claim 1,
The camera unit
In case of embedded IP camera and microphone, in CCTV system, each camera is embedded with IP camera and microphone and is equipped with codec, digital signal processor (DSP) and communication unit. Coding and Encryption Transmission Processing Unit. The method of claim 1,
The compression / encryption device (TECT equipment)
A HEVC conversion module for compressing the image data of the IP camera into various types of codec (AVC) image data by HEVC transcoding, and performing image processing with a minimum unit coding unit (CU);
An encryption module for encrypting the HEVC transcoded stream by the HEVC conversion module in block units by a symmetric key algorithm; And
In addition, a compression encryption module for encrypting the voice data, IP-based CCTV camera image and audio data transcoding and encryption transmission processing apparatus. The method of claim 3,
The video storage and distribution server uses the NVR server or VMS server, the monitoring client of the control PC uses the RTSP protocol,
In the CCTV system, the video storage and distribution server provides a function of the RTSP server for transmitting video stream data of a plurality of IP cameras at the output end,
The monitoring client of the control PC performs an RTSP client function having a video decoder, IP-based CCTV camera transcoding and encryption transmission processing apparatus for video and audio data.

Images