视频监控系统设计外文翻译

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1、 A TRANSLATINGboth systems to advanced, practical, mature, reliable, but also to open systems, scalability, and take into account reasonable investment, the purpose of the best efficiency. CCTV surveillance equipment on the spot on surveillance, control and management of these facilities in a safe,

2、reliable and efficient operation, and make full use of intelligent management role, to create a safe, healthy, comfortable and to be able to improve the efficiency of the fine work environment , energy conservation, and reduce maintenance personnel. According to the projects environmental needs, and

3、 demand for the establishment of joint function of the item CCTV monitoring, 1, the system has the following features: CCTV main task is an important part of the building within the developments, such as dynamic flow conditions macroeconomic surveillance, control, the various anomalies in order to c

4、onduct real-time evidence, review, to the timely processing of purpose. 1) video signal timing, location switch programming. 2) view and record images, and a distinction should be characters time (year, month, day) display. 3) receive signal superimposed elevator floor. 4) synchronized switching: Po

5、wer, synchronous or synchronous. 5) to receive security subsystems signal system, in accordance with the need to achieve joint control or system integration. 6) internal and external communications links. 7) security surveillance television system and security alarm system linked, should be able to

6、automatically switch, display, record of the image signal alarm location and alarm time. 8) Power Control Camera security control room should be unified with green power by the security control room operators-to cut off. On the security control room far away from the camera is powered reunification

7、can be difficult to resolve the nearest, if the system is a synchronous mode of power, and security must be the same for the control room of a reliable power supply. 2, the system has the following features: H.264 compression technology H.264 video coding standard is designed for the high-quality im

8、age compression campaign designed by the low bit-rate image compression standard. H.264 video coding used in the movement of the common coding method, coding and decoding process is divided into two parts interframe coding. Egypt Intra Improved DCT transformation and quantified in the inter-frame of

9、 a 1 / 2 pixel motion vector forecast compensation technology, motion compensation more precise, quantifiable improvements apply variable length coding table (VLC) and quantitative data for entropy coding, coding final coefficient. H.264 standard higher compression ratio, the entire CIF format-mode

10、single occupied bandwidth in the hundreds around the general, occupied bandwidth depending on the specific exercise how many different picture. Deficiency is relatively poor quality of some, occupied bandwidth screen with movement and the complexity of substantial change. In short, this is a closed-

11、circuit television monitor so that the item highly automated, highly efficient elegant comfortable, convenient and speedy, high-security environment of space. System mainly consists of three parts: front-end monitoring; Monitoring Centre (control center); workstation (client). The installation of vi

12、deo surveillance point: Color night vision cameras and color of high illumination cameras and other equipment installed in the designated location, providing 12 VDC power supply and video interface. Monitoring Centre According to specific requirements of schools, teaching areas (of nine school build

13、ings), by Information Centre and the Centre set up a control extensions, the clinic, teachers dormitory (a total of two dormitory) and garage, the living quarters of students (total 12 dormitory) to install a control extensions, canteens, supermarkets, sports centre, student activity centre, Trainin

14、g Center, the south gate, Simon and the North have set up a control extensions, in the host control centre set up to monitor the entire campus that in turn control the first time police information and criminals every move in the room were Baoweichu president and the establishment of a control cente

15、r. DVR control center through the control system can be arbitrary view the full image (to authority), and a monitoring point for the implementation of cloth Chefang, video playback operations (to access). Control centers are located in the Presidents Office, the leading sub-control center can ca arb

16、itrary control of pan, tilt and zoom images and action. As a management and understanding of the situation both inside and outside the hospital auxiliary means. House leadership not to the office in order to understand the key parts of the hospital situation. Through transmission from the remote vid

17、eo signals through digital hard disk video recorders to provide resource sharing connections. All the video and alarm records can be shared through the network (to access).Set up seven distribution of authority, the operators were in a different authority to operate. System of great security, all us

18、ers must provide to the user name and password to detect competence, not manipulation system. Alarm system with tips and video motion detection capabilities greatly save disk space, a police video documentary video to be stored, the system does not reach to facilitate enquiries for information after

19、 the incident, the police want to delete documents must be carried out by the system administrator . Alarm systems also have automated records and functional linkage, the system interface unit with the police, and other police equipment can be connected. Any time a system of regional security alarms

20、 were triggered, the system will automatically switch to alarm the camera screen monitor regional, state and automatically transferred to video. If two or more simultaneous alarm information, the system can simultaneously record or order of the corresponding alarm and regional image. Monitoring Cent

21、re Digital HD recorders, DVR installation of server-side software, including database system. All front-end server management and monitoring equipment, and maintenance of the client network connections at the same time, monitoring of all network workstations authorized users to manage all office LAN

22、 users can log on to a computer server system, depending on image rights surveillance enquiries, such as video playback. To configure and monitor server drives to the video information will be kept a months time.Server software installation is complete, the system automatically configures the video

23、data storage path, users may need to use the server-side management software to change configuration, the system supports distributed video storage for large-capacity storage may be provided. Monitoring center can be set up in a monitoring station, monitoring workstation as a system administrator us

24、er of the system in equipment and user management, including video data maintenance and management. Workstations can be connected with the projector system can be used to monitor or demonstration. monitoring workstation (client) Network computer users to install DVR client software, landing by the s

25、ystem administrator to provide legal status and server access rights, can become a monitoring station. Client software, including: system configuration tools, control software, and audio and video playback software enquiries. System configuration tool: video can be set to undertake the lens division

26、, video server settings, among others. Monitoring Software: 1-9 frame to provide the real-time monitoring, Haeundae or ball machine control. Enquiries playback software: According to the lens name, date / time, video and other types of enquiries, and intervals for the results. Monitoring centre is j

27、ust a computer as a server (under video server configuration corresponding amount of demand for hard disk), can be configured as a workstation monitoring systems management and settings to use, when necessary can be configured a projector and workstations connected to peacetime surveillance or syste

28、m demonstration.Implementation of the system The system of cameras and lenses, Haeundae, protective enclosures, monitors, and other traditional products can basically part of the optional, but it should be used cost-effective products. The system used in high-definition color Huamianbangeqi 16 Huami

29、anbangeqi, automatic image switch selectable switching time, a functional image freeze. Video switch matrix by the Chengdu Branch of the MJ516 video switch matrix, and the ways for its 16-way input, the output of five trade unions Road. It is Chinese characters superimposed clock system uptime enqui

30、ries, a powerful built-in functions such as Chinese Character Library. It is critical to provide the relevant agreements for secondary development. The software is to use some of the major video capture card provided by the API function and video switching matrix provided by the communication protoc

31、ol software and services produced receive software, which is one-way video signals and control signals are two-way. Through LAN control commands can be issued. Conclusion This paper illustrates how the present technological conditions, assembled into one economical and reliable, and compatible with

32、the advanced monitoring system. This system suited to the local area network (10/100 M) on the real-time transmission of digital video images. Multimedia is a simple monitoring system (including video only). Believe that with computer technology, video technology, control technology, communications

33、technology development, network monitoring will also enjoy broad prospects.An analog-to-digital converterAn analog-to-digital converter(ADC) is used to convert a continuously variable signal to a corresponding digital form which can take any one of a fixed number of possible binary values. If the ou

34、tput of the transducer does not vary continuously, no ADC is necessary. In this case the signal conditioning section must convert the incoming signal to a form which can be connected directly to the next part of the interface, the input/output section of the microcomputer itself.The I/O section conv

35、erts digital “on/off” voltage signals to a form which can be presented to the processor via the system buses. Here the state of each input line, whether it is “on” or “off”, is indicated by a corresponding “1” or “0”. In the analog inputs which have been converted to digital form, the patterns of on

36、es and zeros in the internal representation will form binary numbers corresponding to the quantity being converted. Feedback ControlThe class of control problems to be examined here is one of considerable engineering interest. We shall consider systems with several inputs, some known as controls bec

37、ause they may be manipulated and others called external disturbances, which are quite unpredictable. For example, in an industrial furnace we may consider the fuel flow, the ambient temperature, and the loading of material into the furnace to be inputs. Of these, the fuel flow is accessible and can

38、readily be controlled, while the latter two are usually unpredictable disturbances.In such situations, one aspect of the control problems is to determine how the controls should be manipulated so as to counteract the effects of the external disturbances on the state of the system. One possible appro

39、ach to the solution of this problem is to use a continuous measurement of the disturbances, and from this and the known system equations to determine what the control inputs should be as functions of time to give appropriate control of the system state.Digital Interface CircuitsThe signals used with

40、in microcomputer circuits are almost always too small to be connected directly to the “outside world” and some kind of interface must be used to translate them to a more appropriate form. The design of section of interface circuits is one of the most important tasks facing the engineer wishing to ap

41、ply microcomputers. We have seen that in microcomputers information is represented as discrete patterns of bits; this digital form is most useful when the microcomputer is to be connected to equipment which can only be switched on or off, where each bit might represent the state of a switch or actua

42、tor.Care must be taken when connecting logic circuits to ensure that their logic levels and current ratings are compatible. The output voltages produced by a logic circuit are normally specified in terms of worst case values when sourcing or sinking the maximum rated currents. Thus Voh is the guaran

43、teed minimum “high” voltage when sourcing the maximum rated “high” output current Ioh, while Vol is the guaranteed minimum “low” output voltage when sinking the maximum rated “low” output current Iol. There are corresponding specification for logic inputs which specify the minimum input voltage whic

44、h will be recognized as a logic “high” state Vih, and the maximum input voltage which will be regarded as a logic “low” state Vil.For input interface, perhaps the main problem facing the designer is that of electrical noise. Small noises signals may cause the system to malfunction, while larger amou

45、nts of noise can permanently damage it. The designer must be aware of these dangers from the outset. There are many methods to protect interface circuits and microcomputer from various kinds of noise. Following are some example:1. Input and output electrical isolation between the microcomputer syste

46、m and external devices using an opto-isolator or a transformer.2. Removing high frequency noise pulses by a low-pass filter and Schmitt-trigger.3. Protecting against excessive input voltages using a pair of diodes to power supply reversibly biased in normal direction.For output interface, parameters

47、 Voh,Vol,Ioh and Iol of a logic device are usually much to low to allow loads to be connected directly, and in practice an external circuit must be connected to amplify the current and voltage to drive a load. Although several types of semiconductor devices are now available for controlling DC and A

48、C powers up to many kilowatts, there are two basic ways in which a switch can be connected to a load to control it.With series connection, the switch allows current to flow through the load when closed, while with shunt connection closing the switch allows current to bypass the load. Both connection

49、s are useful in low-power circuits, but only the series connection can be used in high-power circuits because of the power wasted in the series resistor R.AT89C52Compatible with MCS-51 Products，8K Bytes of In-System Reprogrammable Flash Memory，Endurance: 1,000 Write/Erase Cycles， Fully Static Operat

50、ion: 0 Hz to 24 MHz，Three-level Program Memory Lock，256 x 8-bit Internal RAM，32 Programmable I/O Lines，Three 16-bit Timer/Counters， Eight Interrupt Sources， Programmable Serial ChannelLow-power Idle and Power-down Modes.DescriptionThe AT89C52 provides the following standard features: 8K bytes of Fla

51、sh, 256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full-duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89C52 is designed with static logic for operation down to zero frequency and supports two software se

52、lectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next hardware reset.AT89C52

53、Timer 2Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter. The type of operation is selected by bit C/T2 in the SFR T2CON (shown in Table 2). Timer 2 has three operating modes: capture, auto-reload (up or down counting), and baud rate generator. The modes are se

54、lected by bits in T2CON, as shown in Table 3. Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 register is incremented every machine cycle. Since a machine cycle consists of 12 oscillator periods, the count rate is 1/12 of the oscillator frequency. In the Counter

55、function, the register is incremented in response to a 1-to-0 transition at its corresponding external input pin, T2. In this function, the external input is sampled during S5P2 of every machine cycle. When the samples show a high in one cycle and a low in the next cycle, the count is incremented. T

56、he new count value appears in the register during S3P1 of the cycle following the one in which the transition was detected. Since two machine cycles (24 oscillator periods) are required to recognize a 1-to-0 transition, the maximum count rate is 1/24 of the oscillator frequency. To ensure that a giv

57、en level is sampled at least once before it changes, the level should be held for at least one full machine cycle.Capture ModeIn the capture mode, two options are selected by bit EXEN2 in T2CON. If EXEN2 = 0, Timer 2 is a 16-bit timer or counter which upon overflow sets bit TF2 in T2CON. This bit ca

58、n then be used to generate an interrupt. If EXEN2 = 1, Timer 2 performs the same operation, but a 1- to-0 transition at external input T2EX also causes the current value in TH2 and TL2 to be captured into RCAP2H and RCAP2L, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON t

59、o be set. The EXF2 bit, like TF2, can generate an interrupt. The capture mode is illustrated in Figure Auto-reload (Up or Down Counter)Timer 2 can be programmed to count up or down when configured in its 16-bit auto-reload mode. This feature is invoked by the DCEN (Down Counter Enable) bit located i

60、n the SFR T2MOD. Upon reset, the DCEN bit is set to 0 so that timer 2 will default to count up. When DCEN is set, Timer 2 can count up or down, depending on the value of the T2EX pin.Baud Rate GeneratorTimer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON. Note that the

61、 baud rates for transmit and receive can be different if Timer 2 is used for the receiver or transmitter and Timer 1 is used for the other function. Setting RCLK and/or TCLK puts Timer 2 into its baud rate generator mode. The baud rate generator mode is similar to the auto-reload mode, in that a rol

62、lover in TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. The baud rates in Modes 1 and 3 are determined by Timer 2s overflow rate according to the following equation.The Timer can be configured for either timer or co

63、unter operation. In most applications, it is configured for timer operation (CP/T2 = 0). The timer operation is different for Timer 2 when it is used as a baud rate generator. Normally, as a timer, it increments every machine cycle (at 1/12 the oscillator frequency). As a baud rate generator, howeve

64、r, it increments every state time (at 1/2 the oscillator frequency). The baud rate formula is given below.where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. Timer 2 as a baud rate generator is shown in Figure 4. This figure is valid only if RCLK or TCLK =

65、1 in T2CON. Note that a rollover in TH2 does not set TF2 and will not generate an interrupt. Note too, that if EXEN2 is set, a 1-to-0 transition in T2EX will set EXF2 but will not cause a reload from (RCAP2H, RCAP2L) to (TH2, TL2). Thus when Timer 2 is in use as a baud rate generator, T2EX can be us

66、ed as an extra external interrupt. Note that when Timer 2 is running (TR2 = 1) as a timer in the baud rate generator mode, TH2 or TL2 should not be read from or written to. Under these conditions, the Timer is incremented every state time, and the results of a read or write may not be accurate. The RCAP2 regis