Purchasing a CCTV camera under the condition of no images to show, what will help when you can not clear wherher the Visual Effects is eligible or not ?
Ok, it will tell that the anwser is technology parameters.
For the above metioned, there are some we should pay more attention to.
1. CCD or Cmos
CCD means Charge Coupled Device,it is the essential element of a CCTV camera and also affect the picture showed. Mostly,Sony and Sharp will be chosen. Talk about CCD, DSP can not be neglected, only cooperate they two can take effect.
Cmos is short for Complementary Metal-Oxide-Semiconductor Transistor and cheap than CCD, more important is that the effect is not worse than the former.
2. Horizontal resolution
The bigger mumber is, the clearer the camera is.
3. Pixels
It used to describe the Image definition.
4. Usable illumination
the capacity of camera can grasp pictures in the darkness
5.TV system
PAL and NTSC should meet the requirent of local TV system,or it will not work .
However, sometimes, maybe you can not believe ,the numbers also lie.
For example,according to the mentioned information,you can easily draw conclusion that sony 600TVL is better than Sony 540TVL,but is it a truth? After comparison, you can redefine what you have already known.
Ok, it will tell that the anwser is technology parameters.
For the above metioned, there are some we should pay more attention to.
1. CCD or Cmos
CCD means Charge Coupled Device,it is the essential element of a CCTV camera and also affect the picture showed. Mostly,Sony and Sharp will be chosen. Talk about CCD, DSP can not be neglected, only cooperate they two can take effect.
Cmos is short for Complementary Metal-Oxide-Semiconductor Transistor and cheap than CCD, more important is that the effect is not worse than the former.
2. Horizontal resolution
The bigger mumber is, the clearer the camera is.
3. Pixels
It used to describe the Image definition.
4. Usable illumination
the capacity of camera can grasp pictures in the darkness
5.TV system
PAL and NTSC should meet the requirent of local TV system,or it will not work .
However, sometimes, maybe you can not believe ,the numbers also lie.
For example,according to the mentioned information,you can easily draw conclusion that sony 600TVL is better than Sony 540TVL,but is it a truth? After comparison, you can redefine what you have already known.
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