CN106303452A - The method that monitor video multichannel strange land uses is solved based on encrypted wireless transmission mode - Google Patents

Abstract

A kind of method solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode, comprise the steps: one, data acquisition: be connected to the hard disk of DVR/NVR by interface, analyze the file system of hard disk, corresponding file support system is loaded, to identify and reading video data file according to the result analyzed；Two, data process: the video data read is carried out AES method encryption and Base-Band Processing, then video data is carried out radio frequency processing；Three, data transmission: the video data processed through data transfers to encrypted wireless signal and launches, floor manager portion carries out A/D conversion, ASE deciphering, is converted into IP traffic after receiving wireless signal；Four, data convert and choosing: analyze the coded format of the video data of output, selects corresponding decoding algorithm, reduction video content, and plays out video flowing, and the part choosing needs is recorded or editing with originally carrying out.

Description

A method to solve the multi-channel remote use of surveillance video based on encrypted wireless transmission

technical field

The invention belongs to the video investigation technology in the field of public security, and relates to a method for accessing a case-related video to a conference site for retrieval and reference, and in particular to a method for solving monitoring video multi-channel remote use based on an encrypted wireless transmission method.

Background technique

With the extensive application of investigation practice and the in-depth development of theoretical research, using surveillance video to investigate and solve crimes has become an important way of investigation. Video images are more and more important to provide support in clue collection, case research and judgment, fact finding, suspect determination, evidence acquisition, and suspect arrest. At present, after the image investigator receives the task, the first step is to determine the relevant video monitoring range based on the information provided by other police types, and then download these videos to the image detection equipment or bring them back to the police station for analysis. Obtaining video is the basis for investigators to carry out their work. The video resources of the image investigation come from the government networking platform and the monitoring equipment built by enterprises, units and individuals in the society. Moreover, social resources play a huge role. In order to facilitate access to social resources, a variety of video download devices have emerged on the market. However, these equipment manufacturers are all committed to the improvement of download speed, the comprehensive types of data transmission interfaces, and the research on the rich aspects of identifying video formats. They ignore the feature of ease of use. In practice, our investigators often encounter the following problems:

1. At present, the video download devices on the market are all based on the DVR or NVR login user name and password known, and there is nothing to do with the DVR/NVR whose user name and password are unknown;

2. The conditions of the video storage computer room cannot satisfy the investigators to stay for a long time to download videos, such as narrow space or severe electromagnetic radiation;

3. Multi-person research is required to determine the download content;

4. A headquarters was set up at the scene of the crime, and there was not enough time to download it, so it was urgent to play the video to the leaders on the spot.

Contents of the invention

A method based on an encrypted wireless transmission method to solve the multi-channel remote use of surveillance video. Using the present invention, the multi-channel remote DVR/NVR video data can be encrypted and sent to the on-site headquarters immediately for multiple people to jointly study and determine the download content. There is no need for investigators to stay in the video storage room for a long time, where DVR is the abbreviation of Digital Video Recorder (Digital Video Recorder), and NVR is the abbreviation of Network Video Recorder (Network Video Recorder).

The present invention is achieved through the following technical solutions:

A method for solving surveillance video multi-channel off-site use based on an encrypted wireless transmission method, comprising the following steps:

(1) Data collection

Connect to the hard disk of DVR/NVR through IDE, SATA, USB and other interfaces, analyze the file system of the hard disk, and load the corresponding file support system according to the analysis results to identify and read video data files.

(2) Data processing

Perform baseband processing and radio frequency processing on the read data.

(3) Data transmission

Convert the processed video data into encrypted wireless signals for transmission. After receiving the wireless signals, the on-site headquarters performs A/D conversion, ASE decryption, and converts them into IP data streams.

(4) Data restoration and selection

Analyze the encoding format of the output video data, select the corresponding decoding algorithm, restore the video content, and play the video stream, select the required parts for local recording or editing.

Further, the file system of the hard disk described in the step (1) includes: RTOS compatible file system, pSOS compatible file system, embedded Linux compatible file system, vxWorks compatible, MS-DOS compatible file system, UNIX compatible file system, Windows compatible file system, etc.

Further, the baseband processing flow described in the step (2) is as follows: the read video data is encrypted by AES method, and the encrypted data is subjected to LDPC encoding, channel interleaving, and COFDM modulation.

Further, the video processing in the step (2) includes: D/A conversion, up-conversion, power amplifier+filtering, and transmission.

Beneficial effect

1. A method based on encrypted wireless transmission to solve the multi-channel and remote use of surveillance video, which solves the problem of needing to know the user name and password of DVR or NVR.

2. A method based on an encrypted wireless transmission method to solve the multi-channel and remote use of surveillance video, which solves the problem that the video download equipment currently on the market needs to stay in the video storage room for a long time for operation, and effectively reduces the video download work of investigators The degree of difficulty and fatigue keeps investigators away from electromagnetic radiation and noise damage in the computer room.

3. A method based on encrypted wireless transmission to solve the multi-channel and remote use of surveillance video, which can connect multi-site multi-channel video to the headquarters of the crime scene in real time, and successfully overcomes the problem that investigators do not have enough time to download videos but urgently need to report to the command Ministry leaders broadcast the video on the spot.

4. A method based on an encrypted wireless transmission method to solve the multi-channel and remote use of surveillance video, successfully solving the problem of requiring multiple people on site to jointly study and determine the download content.

Description of drawings

Fig. 1 is a work flowchart of the present invention.

Fig. 2 is an architecture diagram of the application mode of the present invention.

Fig. 3 is a flow chart of data collection in the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 2 is the application frame diagram of the present invention, as can be seen, the present invention can simultaneously send the video data encryption of multi-channel off-site DVR/NVR to the on-site headquarters immediately, then decipher and play by the on-site headquarters, and select required The video is recorded and edited locally.

Fig. 1 is a kind of working flow chart of the method for solving monitoring video multi-channel off-site use based on encrypted wireless transmission mode, Fig. 3 is the data acquisition flow chart of the present invention, can find out according to Fig. 3, according to whether finding file system identifier, The general system analysis method or the special system analysis method were used to collect the data respectively.

Embodiment 1 general system analysis method carries out data collection

1. Data collection

Connect to the hard disk of DVR/NVR through IDE, SATA, USB and other interfaces, and analyze the file system of the hard disk, such as RTOS compatible file system, pSOS compatible file system, embedded Linux compatible file system, vxWorks compatible, MS-DOS compatible file system, UNIX compatible file system, Windows compatible file system, etc. Load the corresponding file support system according to the analysis results to identify and read video data files.

Find the file system identifier and use the general system analysis method. The specific workflow is as follows:

(1) Check physical media devices, analyze disk physical sectors, and scan common file system identifiers.

(2) Load the corresponding file system driver after finding the common file system identifier.

(3) Analyze the disk to determine whether the medium contains the file system corresponding to the identifier.

(4) The file system driver "assembles" the corresponding file system.

(5) Read the disk video data file.

(6) Store the video data in the "data sending buffer area".

2. Data processing

(1) Baseband processing

The video data and file system information in the data transmission buffer area are encrypted by AES method, and the encrypted data is subjected to LDPC encoding, channel interleaving, and COFDM modulation.

(2) RF processing

Perform radio frequency processing on the baseband processed data, including: D/A conversion, up-conversion, power amplifier + filtering, and transmission.

3. Data transmission

Convert the processed data into encrypted wireless signals for transmission. After receiving the wireless signals, the on-site headquarters performs A/D conversion, ASE decryption, and stores them in the "data receiving buffer area". At this time, the state of the data packet is the same as the "data sending buffer area". The data.

4. Data restoration and selection

(1) Video data is written into the local file system.

(2) Analyzing the encoding format of the output video data, and selecting a corresponding decoding algorithm.

(3) Restore the video content, and play the video stream, and select the required parts to record or edit.

Embodiment 2 special system analysis method carries out data collection

1. Data collection

Connect to the hard disk of DVR/NVR through IDE, SATA, USB and other interfaces, and analyze the file system of the hard disk, such as RTOS compatible file system, pSOS compatible file system, embedded Linux compatible file system, vxWorks compatible, MS-DOS compatible file system, UNIX compatible file system, Windows compatible file system, etc. Load the corresponding file support system according to the analysis results to identify and read video data files.

The file system identifier cannot be found, and the special system analysis method is used for analysis. The specific process is as follows:

(1) Check the physical media device, analyze the physical sectors of the disk, scan the low-end sectors to find the disk information area, and obtain the current disk information and basic file system information from the disk information area, including the following information:

Format flag, total number of data blocks, size of data block, start address of currently available data block, currently used partition, start sector of reserved information area, size of reserved information area, start sector of file information block, size of file information area, Index information block start sector, index information area size;

(2) Read the file information area to obtain the file information of the video file, specifically including the following information:

File number, recording start time, recording end time, file start, file end, index information start address, index information end address;

(3) read the index information area, to obtain the index information of the used data block of the video file, specifically include the following information:

The time offset from the previous data block, the physical offset from the previous data block, the starting data block address of this index block, the time offset between this index block and the previous index block;

(4) Read the data block to obtain the video data

(5) Store the video data in the "data sending buffer area".

2. Data processing

(1) Baseband processing

The video data and file system information in the data transmission buffer area are encrypted by AES method, and the encrypted data is subjected to LDPC encoding, channel interleaving, and COFDM modulation.

(2) RF processing

Perform radio frequency processing on the baseband processed data, including: D/A conversion, up-conversion, power amplifier + filtering, and transmission.

3. Data transmission

Convert the processed data into encrypted wireless signals for transmission. After receiving the wireless signals, the on-site headquarters performs A/D conversion, ASE decryption, and stores them in the "data receiving buffer area". At this time, the state of the data packet is the same as the "data sending buffer area". The data.

4. Data restoration and selection

(1) Video data is written into the local file system.

(2) Analyzing the encoding format of the output video data, and selecting a corresponding decoding algorithm.

(3) Restore the video content, and play the video stream, and select the required parts to record or edit.

Claims (7)

1. solve, based on encrypted wireless transmission mode, the method that monitor video multichannel strange land uses, it is characterised in that include as follows Step:

(1) data acquisition

It is connected to the hard disk of DVR/NVR by interfaces such as IDE, SATA, USB, analyzes the file system of hard disk, according to the knot analyzed Fruit loads corresponding file support system, to identify and reading video data file.

(2) data process

The data read are carried out Base-Band Processing and radio frequency processing.

(3) data transmission

The video data processed through data transferring to encrypted wireless signal launch, floor manager portion is carried out after receiving wireless signal A/D conversion, ASE decipher, are converted into IP traffic.

(4) data convert and choosing

Analyze the coded format of the video data of output, select corresponding decoding algorithm, reduction video content, and video flowing is carried out Playing, the part choosing needs is recorded or editing with originally carrying out.

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that the file system of the hard disk described in step () includes: RTOS compatible filesystems, pSOS compatibility literary composition Part system, built-in Linux compatible filesystems, vxWorks are compatible, MS-DOS compatible filesystems, UNIX compatible files system System, Windows compatible filesystems etc..

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that the Base-Band Processing flow process described in step (two) is: the video data read is carried out AES method encryption, Data after encryption carry out LDPC coding, channel interleaving and COFDM modulation.

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that the Video processing described in step (two) includes: D/A conversion, up-conversion, power amplifier+filter, launch.

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that described step () according to whether find file system identifier, be respectively adopted general-purpose system analytic process or Dedicated system analytic process carries out the collection of data.

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that described general-purpose system analytic process concrete operations flow process is as follows:

(1) check physical medium equipment, analyze disk physical sector, scan universal document system identifier；

(2) corresponding file system driver is loaded after finding universal document system identifier；

(3) analyze disk, determine and on medium, whether contain the file system that identifier is corresponding；

(4) file system driver " assembles " respective file system；

(5) reading disk video data file；

(6) video data is stored in " data transmission buffer area ".

A kind of side solving the use of monitor video multichannel strange land based on encrypted wireless transmission mode Method, it is characterised in that described dedicated system analytic process concrete operations flow process is as follows:

(1) check physical medium equipment, analyze disk physical sector, scan low side sector, to find disk information area, from disk The information area obtains current disc information and file system essential information, specifically includes following information:

Format mark, total data block number, the size of data block, currently available data block start address, currently used subregion, Retain the information area to start sector, retain information area size, fileinfo BOB(beginning of block) sector, fileinfo district size, index information BOB(beginning of block) sector, index information district size；

(2) read fileinfo district, to obtain the fileinfo of video file, specifically include following information:

File sequence number, video recording time started, video recording end time, file start, the end of file, index information start address, rope Fuse breath end address；

(3) read index information district, to obtain the index information of the used data block of video file, specifically include following information:

Time migration with a upper data block and the physical deflection of a upper data block, the initial data block ground of this index block The time migration of location, this index block and a upper index block；

(4) read block, it is thus achieved that video data；

(5) video data is stored in " data transmission buffer area ".