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.
Post je objavljen 30.07.2014. u 05:46 sati.