ip camera system
30.07.2014., srijeda
various multi-camera 16ch nvr system
|
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. |
