Classification of CCD cameras
In the security system, the current image generation is mainly from the CCD camera, CCD is the abbreviation of charge coupled device (charge coupled deice), it can turn the light into a charge and store and transfer the charge, can also take out the stored charge The voltage changes, so it is an ideal camera element. The CCD camera composed of it has the characteristics of small size, light weight, partial influence of magnetic field, anti-shock and impact characteristics, and is widely used.
CCD cameras can be roughly divided into the following categories:
By imaging color
(1) Color camera: It is suitable for distinguishing details of scenery, such as distinguishing the color of clothing or scenery. The amount of information increases due to the presence of color. The amount of information is generally considered to be 10 times that of a black and white camera.
(2) Black and white camera: It is used in areas with insufficient light and where lighting equipment cannot be installed at night. When only monitoring the position or movement of the scene, a black and white camera with a resolution generally higher than that of a color camera can be selected.
By camera resolution
(1) Low-end type with image pixels of about 250,000 pixels (pixel), a color resolution of 330 lines, and a black and white resolution of about 420 lines.
(2) Mid-range type with image pixels between 250,000 and 380,000, color resolution of 420 lines and black and white resolution of 500 lines
(3) The image is over 380,000 dots, the color resolution is greater than or equal to 480 lines, black and white resolution, and high resolution above 570 lines.
By camera sensitivity
(1) Normal type: the illuminance required for normal work is 1 ~ 3 Lux
(2) Moonlight type: the illuminance required for normal work is about 0.1 Lux
(3) Starlight type: Illumination required for normal work is less than 0.01 Lux
(4) Infrared illumination type: in principle, it can be zero illuminance, and the infrared light source is used for imaging.
According to the size of the CCD target surface of the imaging element
(1) l inch target size is 12.7mm wide x 9.6mm high, 16mm diagonal
(2) The size of the 2 / 3inch target surface is 8.8mm wide x 6.6mm high, and the diagonal is 11mm
(3) The size of the 1 / 2inch target surface is 6.4mm wide x 4.8mm high, and the diagonal is 8mm
(4) The size of the 1 / 3inch target surface is 4.8mm wide x 3.6mm high, and the diagonal is 6mm
(5) The size of the 1 / 4inch target surface is 3.2mm wide x 2.4mm high, and the diagonal is 4mm
(6) 1 / 5inch is under development and no official products have been launched yet
In addition, CCD cameras are divided into PAL system and NTSC system, and can also be divided according to the image signal processing method or according to the structure of the camera.
Led Table Clock,Desk Clock Flip,Desk Clock For Office,Flip Clock With Light
Guangzhou Huanyu Clocking Technologies Co., Ltd. , https://www.findclock.com