1, video video
A: Based on the current TV mode (programmable logic of the ranks of the color system, no black and white standard 625 lines, 2:1 interlaced), the required approximately 6MHz or higher bandwidth of the baseband signal.
2, video detection detecting video
A method of detecting and generating a video image signal by photoelectric imaging technology (from infrared to visible spectral range).
3, video surveillance monitoring video
A: using video detection means to monitor, control and information of the target.
4, video transmission transmitting video
A: using wired or wireless transmission media, directly or through modulation and demodulation and other means, the video image signal from one to another, from one device to another device. In this system, the video signal is usually included in the video image signal from the front camera to the video host device, from the video host to the display terminal, from the video host to the sub control, from the video optical transmitter to the video optical receiver.
5, video host controller/switcher video
Answer: usually refers to the video control host, it is the core of the operation and control of video system settings, usually can switch, PTZ and lens on the image of the control.
6. Check to alarm video to check the alarm image.
A: when the alarm event occurs, the video monitoring system can automatically call the alarm area and the image, so as to observe the status of the field review.
7, alarm linkage with alarm action
Answer: when the alarm event occurs, causing the alarm events other than the equipment to carry out the action (such as the alarm image review, lighting control, etc.).
8, video and audio synchronization of video and audio synchronization
Answer: refers to the same scene from the video, audio signal synchronous switching.
9, ambient illumination illumination environmental
Answer: the physical quantity reflecting the target environment brightness, is equal to the vertical through the luminous flux per unit area.
10, image quality quality picture
Answer: refers to the observation of the quality of the optical image, it usually includes the number of pixels, the resolution and the signal to noise ratio, but mainly for the signal to noise ratio.
11, image resolution resolution picture
A: the number of TV lines that can tell the maximum number of targets in a certain length, in a horizontal or vertical direction.
12, front-end equipment device terminal
Answer: refers to the distribution of various types of equipment to detect, in this system, usually refers to the camera and the related equipment and supporting (such as camera, PTZ, decoding drive, protective cover etc.).
13, sub control console branch
A: usually refers to the central control room set up outside the control and observation terminal equipment.
14, video mobile alarm moving deteting video
Answer: refers to the use of video technology to detect changes in the scene, once the set value is reached, the alarm information is issued a warning means.
15, video signal loss alarm loss alarm video
A: when the video signal to the front end of the video signal is monitored, once the peak value of the video signal is less than the set value, the system is lost for the video signal, and gives the alarm information of a system function.
16, resolution
Answer: the resolution is an important parameter to measure the quality of the camera, it refers to when the camera arrangement interval of black and white stripes, on the monitor (than the high resolution camera) to see the largest number of lines. When more than the line number on the screen, you can only see a gray and can no longer distinguish black and white lines.
17, the signal-to-noise ratio and gamma correction coefficient
A: the signal to noise ratio is a major parameter of the camera. The basic definition is the signal to noise ratio multiplied by 20log, the signal-to-noise ratio of general camera were given in the closure of the AGC value, because when the AGC is turned on, the small signal, makes the noise level increases. The typical value of the signal to noise ratio of the CCD camera is generally 45-55dB. When measuring the signal to noise ratio, the video measuring instrument should be used to connect the video output terminal of the video camera directly. Gamma correction factor mentioned above, the typical value of gamma =0.45. Most of the current camera uses a fixed gamma value.
18, white balance and black balance
Answer: 1, white balance is an important parameter of color camera, it directly affects the effect of color image reproduction, when the camera white balance settings do not reproduce the image at that time, there will be partial color phenomena, especially the original without color objects (such as white walls) is also on the color.
One of the important parameters of 2, balance is black color camera, it refers to the camera in the shooting scene or black cover lens cover, 3 output level should be equal to, to reproduce the pure black on the monitor screen.
Definition 3, white balance usually people shooting white objects are red, green and blue three color Ur=Ug=Ub camera output signal voltage of the phenomenon is called white balance.
4, A, automatic aperture interface; B, electronic shutter; C, automatic gain control; D, backlight compensation; E, lock synchronization.