ip camera system
31.07.2014., četvrtak
security video surveillance systems market
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Control instruction execution layer is our command object, at some point, and we back it said support layer, completely separate collection layer is not very good, we think the object ip camera is to perform a controlled layer devices. For example: PTZ camera, decoders, balls and more. Support layer As the name suggests, the support layer is to support, protect, and support for back-end equipment acquisition layer, implementation layer device. It includes a bracket, shields, etc. auxiliary equipment. Collection layer Acquisition layer 4ch NVR Recorder is a key factor in the security monitoring system quality is good or bad, is also the largest local system cost overhead. It includes a camera, camera, alarm sensors, and so on. 11 security video surveillance systems market Editor According to "China's security industry," second five "development plan" (hereinafter referred to as the "Plan") showed that the "Eleventh Five-Year" period of rapid surveillance camera network camera expansion of the scale of China's security industry, as of 2010, the industry output value reached 23 billion yuan, an average annual growth of more than 23%; among security products to approximately 100 billion yuan output value, especially the rapid development of electronic security products, with an annual growth of around 25%, while video surveillance systems are electronic security products accounted for 55% of the proportion is much higher than the entrance control systems, burglar alarm systems and other categories. Video surveillance system output will break billion "Green City" is recognized as the most important driver of the industry. In 2004, the Ministry of Public Security, Ministry of Science in Beijing, Shanghai, Langfang, Dalian, Nanjing and other 21 cities launched the first batch of police training and technology demonstration city to create jobs. August 2005, the Ministry further proposed the construction of "3111 Pilot Project", select 22 provinces, the provincial, municipal and county levels, alarm and monitoring systems to carry out the construction of pilot projects. Strong impetus to the "Green City" in the pace of construction. With the 2008 "3111 pilot project," the success and acceptance, have launched or expanded ip camera system 16ch NVR Recorder over the "Green City" construction projects, effective demand for space to open up a video surveillance system. Case Study of Chongqing, according to city planning, its new, expanded video surveillance system integration point access capacity by not less than 500,000 video surveillance points construction projects expected to total investment of 5 billion yuan or so. In addition, industry application market is rapidly opened. "Plan" put forward, along with "peace-building" to promote the pace of some of the traditional areas such as financial, cultural, transportation, government and other security applications will be more in-depth; applications nascent group such as education, health, sports, energy, communications, industrial enterprises and other rapid security systems surveillance system growth in demand; community, residents began to heat up security applications, social applications to accelerate the process. Market applications gradually, big cities to second and third tier cities and rural areas extending from the center of the city, extending from coastal areas to central and western regions, border crossings, and the formation of a certain market demand. |
core of the security monitoring system
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The performance of the city is our most intuitive feel, it shows the quality of the security monitoring system. Such as surveillance video wall, URL=http://www.ipcctvcamera.net]ip camera[/URL] surveillance camera wireless ip camera monitors, treble alarm horn, alarm and automatic SPIDERS phone, etc. belong to this level. Control layer Control layer is the core of the security monitoring system, it is the system most clearly reflected the technological level. There are usually two of our control - analog control and digital control. Analog control is early control, its console is usually controlled by the controller or analog matrix for small local security monitoring system, this control method is low cost, the failure rate is small. But for the purposes of large-scale security monitoring systems, this approach becomes complicated to operate and no price advantage, then we should be more informed choices digital control. Digital control is to control industrial computer as the core monitoring system, it becomes network camera ip camera systemcomplex analog control operation simple mouse clicks, the huge stack reduced to an analog controller industrial computer, the huge number of complex and variable control cables as a serial telephone line. It will become a reality in the remote monitoring provides remote monitoring possible for the Internet. However, digital control is not so perfect, the price is very expensive control panels, waste modules, the system may appear crumble crisis control lags behind so the problem persists. Processing layer Perhaps the processing layer is called audio and video processing layer, transport layer will have audio and video signals sent over to distribution, amplification, processing division, etc., will be connected to the performance of the organic layer and control layer. Audio and video distributor, audio and video amplifiers, 16ch NVR Recorder security systems splitter, audio and video equipment switches, etc. belong to this level. Transport Layer Transport layer security monitoring system is equivalent to the blood. In a small security monitoring system, our most common transport layer device is a video cable, audio cable, For remote monitoring system, we often use the RF line, microwave, for remote monitoring, we usually use the Internet 4ch NVR Recorder this a low-cost carrier. It is worth mentioning that the media transport layer emerging - cable / fiber. Most people there is a misunderstanding in the digital security monitoring, they think digital control layer security monitoring system is used to control digital security monitoring system, and it is not. Pure digital transmission medium security monitoring system must be cable or optical fiber. When signals from the acquisition layer out, it has been modulated into a digital signal, and digital signal surveillance system run on a network has matured, theoretically without attenuation, which guarantees no loss of image displaynetwork camera surveillance system remote monitoring, which is unmatched by analog transmission the. Of course, high returns also require costly investment, which is not pure digital security monitoring system, one of the most important reasons for the popularity. |
30.07.2014., srijeda
White balance is used only for color cameras
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Typically backlight compensation, AGC operating point of the camera by the content of the field of view is determined by averaging, but if the field ip camera wireless ip camera contains a bright background and a dark region of a foreground object, the AGC determined this time operating point may not be enough for the right foreground objects, background light compensation likely to improve the prospects of the target display status. When the backlight compensation is turned on, the camera is only averaging a sub-region of the entire field to determine its AGC operating point, at this time if the foreground object is located in the sub-region, is expected to improve the visibility of foreground objects. (4) in the CCD camera electronic shutter is electronically controlled by an optical imaging surface charge accumulation time to manipulate the shutter. CCD camera electronic shutter control of the accumulated time when the electronic shutter is closed, an NTSC camera, the CCD accumulation time is 1/60 seconds; For PAL camera is 1/50 seconds. When the camera's electronic ip camera system 4ch NVR Recorder shutter open for NTSC video cameras, electronic shutter to cover the 261 steps from 1/60 to 1/10000 second range; For PAL camera, its electronic shutter steps covering surveillance camera network camera 311 places from 1/50 seconds to the range of 1/10000 sec. When the electronic shutter speed increases, the time in each video field allows focusing light on the CCD is reduced, the result will reduce the sensitivity of the camera, however, the observed higher shutter speed for the moving image generates a 'halt operation' effect, which will greatly increase the dynamic resolution of the camera. (5) White balance is used only for color cameras, its purpose is to achieve the camera image can accurately reflect the scene condition, a manual white balance and auto white balance in two ways. A, continuous automatic white balance mode - this time with the change of scenery surveillance camera security systems will set the white balance color temperature and continuously adjusted in the range of 2800 ~ 6000K. This way the color temperature of the scene during the shooting of changing situations is the most suitable, so the natural color performance, but when the scene is little or no white, continuous color balance can not produce the best results. Button ways - such as the first camera at a white wall, white and other white target, and then will automatically switch to the setting mode from the manual position, remains in that position for a few seconds or up to the image appears white, the white balance is performed after, it will automatically switch back to manual mode position to lock the white balance settings, white balance settings at this time the camera will remain in memory until they are changed 4ch NVR Recorder again to perform, the range of 2300 ~ 10000K, during this period, even though camera power is not lost in the setting. Button to set the white balance to the way the most accurate and reliable, suitable for most applications. B, open the manual white balance manually turn the auto white balance, then the change in status of the red or blue image up to 107 level for the regulation, such as an increase or decrease in the level of red, blue, one each to increase or decrease level. In addition to the times, some of the camera as well as the white balance fixed at 3200K (incandescent level) and 5500K (daylight levels) and other grades of command. (6) color adjustment for most applications, the camera is not required to make color adjustments, adjustments need to be adjusted carefully so as not to affect other need color, adjustable ip camera system 16ch NVR Recorder color ways: red - yellow color increases, then the red magenta to move one step. Red - yellow color reduce, then the red to yellow to move step. Blue - yellow color increases, then blue to green to network camera surveillance system blue to move step. Blue - yellow color reduce, then the blue to magenta to move step. 3, digital control method to adjust the formula The new camera to adjust security systems surveillance system the foregoing optional parameter adjustment with digital control, this time without having to manually adjust potentiometers instead of using an auxiliary control codes, and these tuning parameters are stored in digital memory unit, increasing the stability and reliability . |
various multi-camera 16ch nvr system
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Minimum illumination, also called sensitivity. CCD ip camera is sensitive to ambient light, or a CCD imaging normally required when the darkest light. The unit is the lux illuminance (LUX), the smaller the value, the less ip camera wireless ip camera expressed the need for light, the more sensitive the camera. Moon and Star-high sensitivity cameras can work in very dark conditions, 2 ~ 3lux a general illumination, there are less than 1lux ordinary cameras come out. (5) Scan System. There are PAL and NTSC points. (6) on the camcorder. Exchanges have 220V, 110V, 24V, 12V or DC 9V. (7) signal to noise ratio. Typically 46db, if it is 50db, the image has a small amount of noise, but good image quality; case of 60db, the image quality, noise does not appear. (8) video output. Mostly 1Vp-p, 75©, BNC connectors are used. (9) Lens mount. C and CS surveillance camera network camera mode, the difference between them lies in the different photographic distance. 2, CCD color camera adjustable features Select (1) synchronous mode A, for a single camera, the main synchronization mode has the following three ways: Internal Synchronization - use cameras inside the crystal oscillator circuit generates a sync signal to complete the operation. External synchronization - use an external synchronization signal sync signal generator to the camera's external synchronization input to achieve synchronization. Power Sync - also known ip camera system 4ch NVR Recorder as linear locking or row locking, is the use of the camera's AC power to complete the vertical push synchronization, namely the zero line cameras and synchronized power. B, for multi-camera system, hoping that all of the video input signal is the vertical sync, so transform the camera output, without causing picture distortion, but due to various multi-camera system camera three-phase power supply may be drawn from the different phases, or even the entire system is not synchronized with the AC power, measures can be taken at this time are: synchronization signals are used with an external sync signal generator into the outside of each camera to adjust the synchronization input sync. Adjusting the cameras' phase adjustment "potential, due to the camera at the factory, which is ip camera system 16ch NVR Recorder security systems associated with the rising edge of the vertical sync zero crossing of the AC are in phase, so the use of a phase delay circuit allows each camera has a different phase shift, thus get the right vertical sync phase adjustment range from 0 to 360 degrees. (2) all the AGC from the CCD camera has a zoom into the signal level of the video amplifier can be used, i.e. the amount of amplification gain, equivalent to a higher sensitivity, it may be sensitive in low light, but in bright light environment amplifier overload, the video signal distortion. To do this, use the camera's automatic gain control (AGC) circuit to detect the level of the video signal, timely switch AGC, enabling the camera to work in a wide network camera surveillance system range of light, namely dynamic range, ie, when the illumination automatically increase the sensitivity security systems surveillance system of the camera, thereby improving the strength of the image signal to obtain a clear image. |
surveillance systems security
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Divided by scanning standard PAL system. NTSC system. China uses interlaced scanning (PAL) format (black and white as the CCIR), the standard is 625 lines, 50 fields, only medical or other ip camera wireless ip camera professional fields just use some non-standard formats. In addition, Japan is NTSC system, 525 lines, 60 fields (black and white for the EIA). 5, according to ip camera surveillance camera the power supply division 110VAC (NTSC format mostly kind), 220VAC, 24VAC. 12VDC or 9VDC (mostly miniature cameras such). 6, according to the division Sync.system: synchronizing signal generating circuit generates a sync signal with the camera to complete the operation. External synchronization: Use an external sync signal generator, the external sync signal into the camera sync input. Power synchronization (linear lock, line lock): AC power with a camera to complete the vertical push sync. VD external sync: The VD sync pulse network camera ip camera system input signal cables to complete the camera outside the VD synchronization. Synchronize multiple cameras outside: the stationary outer synchronizing multiple cameras, each camera that can work under the same conditions, because the camera sync, so even if one switch to the other scene camera, the screen will not synchronize the camera distortion. 7, according to the degree of division, CCD is divided into: Normal work required illumination 1 ~ 3LUX Type of work ip camera system 4ch NVR Recorder required moonlight illumination around 0.1LUX Star-type work required 16ch NVR Recorder illumination 0.01LUX less Infrared lighting infrared type, in the case of no light can be imaged 8, by the appearance of: Organic plate, Pinhole, Dome. The main technical indicators CCD color camera (1) CCD size, ie the camera target surface. Most network camera surveillance system of the original 1/2 inch, 1/3 inch has popularity, 1/4 inch and 1/5 inches have been commercialized. (2) CCD pixel CCD is the key performance indicators, which determines the clarity of the display image, the higher the resolution, the better the performance of image detail. CCD is the array of photosensitive elements, each element is called a pixel, the more pixels, the sharper the image. Most of the market with 250,000 and 380,000 pixels demarcation, more than 380,000 pixels for high-definition video camera. (3) horizontal resolution. Typical resolution color camera is between 320 to 500 TV lines, there are different surveillance camera security systems grades of 330 lines, 380 lines, 420 lines, 460 lines, 500 lines. Resolution is the power of sight (referred to as line TVLINES) to represent the color camera resolution between 330 and 500 lines. Resolution of the CCD and lens, but also on the width of the band is directly related to the camera circuit channel law security systems surveillance system is generally equivalent to the bandwidth of 1MHz resolution of 80 lines. The wider the band, the sharper the image, the greater the relative line number. |
