It is a front-end device that acquires the image of the surveillance site. It uses the area array CCD image sensor as the core component, plus a synchronization signal generation circuit, a video signal processing circuit, and a power supply.
The camera is a front-end device that acquires the image of the surveillance site. It uses the area-array CCD image sensor as the core component, plus a synchronization signal generation circuit, a video signal processing circuit, and a power supply.
The camera's scanning system monitors the scene's scene and can image it on the camera's light-sensitive target surface. After scan conversion, the image is output as a continuous electrical signal.
The CCD image sensor is called charge-coupled device. The core component of the CCD camera is the area array type CCD image sensor, which is composed of hundreds of thousands of equivalent miniature MOS capacitors integrated on the same silicon chip.
CCD Size and Number of Pixels The CCD size refers to the size of the diagonal of the photosensitive surface of the CCD image sensor.
The number of pixels refers to the number of large pixels of the camera CCD sensor. For a certain size of the CCD chip, the larger the number of pixels, the smaller the area per pixel unit, and the higher the resolution of the camera constituted by the chip. .
Resolution is an important parameter to measure the merits of a camera. It refers to the maximum number of lines that can be seen on a monitor when the camera takes equally spaced black and white lines.
Minimum illuminance is also an important parameter to measure the merits of the camera. Sometimes the word “lowest†is omitted and it is referred to as illuminance directly. It refers to the brightness value of the scene when the brightness of the subject is low enough to cause the video signal output by the camera to fall below a specified value.
The SNR is also a major parameter of the camera. The basic definition is the signal to noise ratio times 20 log. The typical SNR of a CCD camera is generally 45-55 dB.
Auto iris interface Most of the standard CCD cameras currently available on the market have an interface for driving an auto iris lens. Some of them can provide two types of driving methods simultaneously (video drive, DC drive). Video drive means that the camera rotates the video signal motor; The DC driving method means that the lens diaphragm motor drive circuit is added inside the camera. It can directly output the DC control voltage to the iris motor in the lens and make it rotate. General video drive auto iris interface uses 3 pins, namely power supply, video, ground; and DC drive auto iris interface uses 4 pins, namely damping positive, damping negative, driving positive, and driving negative.
The electronic shutter is a term coined for the camera's mechanical shutter function, which is equivalent to controlling the exposure time of a CCD image sensor.
The video signal output by the automatic gain control camera must reach the standard level specified by the TV transmission, that is, 0.7VPP. In order to be able to output the standard video signal of 0.7VPP under different illumination conditions, the gain of the amplifier must be larger. Within the scope of adjustment. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that implements this function is called an automatic gain control circuit, or AGC for short.
Auto iris interface Most of the standard CCD cameras currently available on the market have an interface for driving an auto iris lens. Some of them can provide two types of driving methods simultaneously (video drive, DC drive). Video drive means that the camera rotates the video signal motor; The DC driving method means that the lens diaphragm motor drive circuit is added inside the camera. It can directly output the DC control voltage to the iris motor in the lens and make it rotate. General video drive auto iris interface uses 3 pins, namely power supply, video, ground; and DC drive auto iris interface uses 4 pins, namely damping positive, damping negative, driving positive, and driving negative.
The electronic shutter is a term coined for the camera's mechanical shutter function, which is equivalent to controlling the exposure time of a CCD image sensor.
The video signal output by the automatic gain control camera must reach the standard level specified by the TV transmission, that is, 0.7VPP. In order to be able to output the standard video signal of 0.7VPP under different illumination conditions, the gain of the amplifier must be larger. Within the scope of adjustment. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that implements this function is called an automatic gain control circuit, or AGC for short.
Backlight compensation is also called backlight compensation or backlight compensation, which can effectively compensate for the darkness of the subject when the camera is shooting in a backlight environment.
Line lock synchronization is a synchronization method that uses AC power to lock the camera field sync pulses. When the image is disturbed by a net power caused by the AC power source, turn the switch to the position of the line lock synchronization (L, L) to eliminate the AC power interference.
White balance and black balance White balance is an important parameter of the color camera. It directly affects the color effect of the reproduced image. When the white balance of the camera is set incorrectly, the color reproduction phenomenon will occur in the reproduced image, especially if the original is not included. The color scene is also colored. Black balance is also an important parameter of a color camera. It means that when the camera shoots a black object or covers the lens cap, the three basic output levels should be equal, so that pure black is reproduced on the monitor screen.
Horizontal Phase Adjustment The horizontal phase (HP), also known as row phase, has a strict locking relationship with the color subcarriers.
Vertical phase adjustment is also called field phase. It also has a strict locking relationship with the row phase, which is mainly used to ensure the correct television scanning law.
The lens lens is an integral part of the TV monitor. The lens cooperates with the CCD camera to image the long-distance target on the CCD target surface of the camera. A wide variety of lenses, from the focal length classification, can be divided into short focal length, medium focal length, long focal length and zoom lens; from the size of the field of view can be divided into wide-angle, standard, telephoto lens; from the structural classification, also Can be divided into fixed aperture fixed-focus lens, manual aperture fixed-focus lens, automatic aperture fixed-focus lens, manual zoom lens, automatic iris motorized zoom lens, electric three variable lens (aperture, focal length, focus these three can be) and other types .
The camera is a front-end device that acquires the image of the surveillance site. It uses the area-array CCD image sensor as the core component, plus a synchronization signal generation circuit, a video signal processing circuit, and a power supply.
The camera's scanning system monitors the scene's scene and can image it on the camera's light-sensitive target surface. After scan conversion, the image is output as a continuous electrical signal.
The CCD image sensor is called charge-coupled device. The core component of the CCD camera is the area array type CCD image sensor, which is composed of hundreds of thousands of equivalent miniature MOS capacitors integrated on the same silicon chip.
CCD Size and Number of Pixels The CCD size refers to the size of the diagonal of the photosensitive surface of the CCD image sensor.
The number of pixels refers to the number of large pixels of the camera CCD sensor. For a certain size of the CCD chip, the larger the number of pixels, the smaller the area per pixel unit, and the higher the resolution of the camera constituted by the chip. .
Resolution is an important parameter to measure the merits of a camera. It refers to the maximum number of lines that can be seen on a monitor when the camera takes equally spaced black and white lines.
Minimum illuminance is also an important parameter to measure the merits of the camera. Sometimes the word “lowest†is omitted and it is referred to as illuminance directly. It refers to the brightness value of the scene when the brightness of the subject is low enough to cause the video signal output by the camera to fall below a specified value.
The SNR is also a major parameter of the camera. The basic definition is the signal to noise ratio times 20 log. The typical SNR of a CCD camera is generally 45-55 dB.
Auto iris interface Most of the standard CCD cameras currently available on the market have an interface for driving an auto iris lens. Some of them can provide two types of driving methods simultaneously (video drive, DC drive). Video drive means that the camera rotates the video signal motor; The DC driving method means that the lens diaphragm motor drive circuit is added inside the camera. It can directly output the DC control voltage to the iris motor in the lens and make it rotate. General video drive auto iris interface uses 3 pins, namely power supply, video, ground; and DC drive auto iris interface uses 4 pins, namely damping positive, damping negative, driving positive, and driving negative.
The electronic shutter is a term coined for the camera's mechanical shutter function, which is equivalent to controlling the exposure time of a CCD image sensor.
The video signal output by the automatic gain control camera must reach the standard level specified by the TV transmission, that is, 0.7VPP. In order to be able to output the standard video signal of 0.7VPP under different illumination conditions, the gain of the amplifier must be larger. Within the scope of adjustment. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that implements this function is called an automatic gain control circuit, or AGC for short.
Auto iris interface Most of the standard CCD cameras currently available on the market have an interface for driving an auto iris lens. Some of them can provide two types of driving methods simultaneously (video drive, DC drive). Video drive means that the camera rotates the video signal motor; The DC driving method means that the lens diaphragm motor drive circuit is added inside the camera. It can directly output the DC control voltage to the iris motor in the lens and make it rotate. General video drive auto iris interface uses 3 pins, namely power supply, video, ground; and DC drive auto iris interface uses 4 pins, namely damping positive, damping negative, driving positive, and driving negative.
The electronic shutter is a term coined for the camera's mechanical shutter function, which is equivalent to controlling the exposure time of a CCD image sensor.
The video signal output by the automatic gain control camera must reach the standard level specified by the TV transmission, that is, 0.7VPP. In order to be able to output the standard video signal of 0.7VPP under different illumination conditions, the gain of the amplifier must be larger. Within the scope of adjustment. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that implements this function is called an automatic gain control circuit, or AGC for short.
Backlight compensation is also called backlight compensation or backlight compensation, which can effectively compensate for the darkness of the subject when the camera is shooting in a backlight environment.
Line lock synchronization is a synchronization method that uses AC power to lock the camera field sync pulses. When the image is disturbed by a net power caused by the AC power source, turn the switch to the position of the line lock synchronization (L, L) to eliminate the AC power interference.
White balance and black balance White balance is an important parameter of the color camera. It directly affects the color effect of the reproduced image. When the white balance of the camera is set incorrectly, the color reproduction phenomenon will occur in the reproduced image, especially if the original is not included. The color scene is also colored. Black balance is also an important parameter of a color camera. It means that when the camera shoots a black object or covers the lens cap, the three basic output levels should be equal, so that pure black is reproduced on the monitor screen.
Horizontal Phase Adjustment The horizontal phase (HP), also known as row phase, has a strict locking relationship with the color subcarriers.
Vertical phase adjustment is also called field phase. It also has a strict locking relationship with the row phase, which is mainly used to ensure the correct television scanning law.
The lens lens is an integral part of the TV monitor. The lens cooperates with the CCD camera to image the long-distance target on the CCD target surface of the camera. A wide variety of lenses, from the focal length classification, can be divided into short focal length, medium focal length, long focal length and zoom lens; from the size of the field of view can be divided into wide-angle, standard, telephoto lens; from the structural classification, also Can be divided into fixed aperture fixed-focus lens, manual aperture fixed-focus lens, automatic aperture fixed-focus lens, manual zoom lens, automatic iris motorized zoom lens, electric three variable lens (aperture, focal length, focus these three can be) and other types .
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