Surveillance cameras
Is access to monitor live images of the front-end equipment, it is to area array CCD image sensor as the core components, plus sync signal generation circuit, video signal processing circuit and power supplies.
Camera Scan System
Control over the scene of the scene can be shot in the photosensitive target surface imaging camera, and then convert the scanned image to form a continuous electrical output.
CCD image sensor
Called charge-coupled device, CCD camera is the core component of surface formation CCD image sensor, which consists of integrated on the same piece of silicon equivalent of hundreds of thousands of micro-MOS capacitors form.
CCD size and the number of pixels
CCD size refers to the photosensitive surface of the CCD image sensor diagonal dimensions.
Pixels
Refers to the TV camera CCD sensor pixels, the CCD chip for a certain size, more pixels means smaller cell area of ??each pixel, and thus constituted by the chip, the higher the resolution of the camera.
Resolution
Camera is a measure of the merits of an important parameter, which refers to when the camera uptake spaced black and white stripes on the monitor can see the maximum number of lines.
Minimum Illumination
Also a measure of the merits of an important camera parameters, and sometimes dispense with the "minimum" word directly referred to as illumination. It refers to the scene when the subject is low light intensity to a certain extent leaving the video camera output signal level to a specified value when the scene brightness value.
SNR
Is one of the main parameters of the camera. The basic definition is the signal to noise ratio is multiplied by 20log. CCD camera noise ratio typically is generally 45 --- 55dB.
Auto Iris Interface
Currently on the market to see most of the standard CCD camera with auto iris lens drive interface, and some can offer both drive (video drivers, DC-drive) video camera to drive the video signal is the motor rotation; DC drive refers to the internal camera lens aperture to increase the motor drive circuit, you can directly control the output DC voltage to the motor inside the lens aperture and make it turn. Video Drive Auto Iris interfaces generally use 3-pin, that power is, video, ground; and DC drive auto iris 4-pin interface, which is damping, damping the negative, positive drive, drive negative.
Electronic Shutter
Is based upon the camera’s mechanical shutter function of a term, which is equivalent to control the CCD image sensor sensitive time.
Automatic Gain Control
The video camera output signal must reach the required standard TV transmission level, that is 0.7VPP, to the scene in different conditions of illumination can be output 0.7VPP standard video signal, the amplifier must be able to gain a larger range adjust. This gain adjustment is usually the video signal by detecting the average level and automatically, to achieve this function of the circuit known as automatic gain control circuit, referred to as the AGC circuit.
BLC
Also known as BLC or backlight correction, it can effectively compensate for camera when shooting in backlit conditions the main screen dark defects.
Line lock synchronization
AC power is used to lock the camera vertical sync pulses of a synchronous way. When the image appears due to the AC power wave interference caused by network, this switch line lock synchronization (L, L) position, you can eliminate AC power interference.
White balance and black balance
White is the color of important parameters of the camera, it directly affects the reproduction of the picture color effects, when the camera’s white balance settings are not at that time, the image will be cast to reproduce the phenomenon, especially without the original will also color the scene with on the color. Black balance is also an important parameter color camera, it is the camera shooting the scene, or a black lens cap, the output of the three basic level should be equal, so the monitor screen and reproduce pure black.
Horizontal phase adjustment
Level of phase (HP), also known as line phase, it has a strict color subcarrier locked relationship.
Vertical phase adjustment
Also known as the field phase, it also has a strict line of phase lock relationship is mainly used to ensure the right television scanning law.
Shot
Lens is an essential part television monitor, with the lens and CCD camera can be long-range goal of imaging in the CCD camera target surface. Lens range from focus on the classification, can be divided into short focal length, the focal length, long focal length and zoom lens; from the field the size of the classification can be divided into wide-angle, standard, telephoto lens; from the structure classification, can also be divided into fixed-aperture fixed lens, manual iris fixed focus lens, auto iris fixed lens, manual zoom lens, auto iris motorized zoom lens, electric three variable lens (aperture, focal length, focus the three available), etc. type.
Lens size image
Lens can be divided into 25.4mm (1in), 16.9mm (2/3in), 12.7mm (1/2in), 8.47mm (1/3in) and 6.35mm (1/4in) and other types of specifications, which correspond to different image sizes, use the lens, the lens should be consistent image size.
Lens focal length
In practice, there is often a user asked how far the camera can see objects or the camera can see the number of wide scenes and other issues, this is actually the first use by the lens focal length to determine, because the focal length determines the camera image size, with different focal length lens on the camera the same position when an object with a long focal length camera lens the size of the intake on the big scene, and vice versa, with a short focal length lens of the camera on the small size of the scene intake .
Lens Aperture
In order to control the flux through the lens size, are set in the back of the lens aperture. Assume that the effective aperture diameter of d, because of light refraction and relationships, the actual effective aperture of the lens D, D and the ratio of focal length f is defined as the relative aperture A, ie A = D / f
Lens Angle
Lens Field of view: there is a certain vision of the lens, lens of the vision and the height and width of the angle of inclination is called the field of view.
