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知道智慧树答案 
1、多选题：
The main application of network video surveillance technology is security prevention, which includes the main security elements ( )
选项：
A: Goals to protect/Person in charge of safet
B: The physical prevention measures of the target encircling
C: The extension mechanism of human visual perception (equipment)
D: Policies and regulations
答案: 【 Goals to protect/Person in charge of safet;
The physical prevention measures of the target encircling;
The extension mechanism of human visual perception (equipment)】
2、判断题：
The special function of "piercing eye" in the myth story is the remote video transmission function in the network video surveillance technology. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
3、判断题：
The special features of the mythical story, "thousand-mile eye" and "wind-accompanying ear", correspond to the remote transmission of video and audio that can be realized in the widely used network video surveillance technology. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
1、多选题：
The composition of analog video surveillance systems includes ( )
选项：
A: Video signal acquisition part
B: Signal transmission part
C: Switching control part
D: Display and recording section
答案: 【 Video signal acquisition part;
Signal transmission part;
Switching control part;
Display and recording section】
2、多选题：
In the switching control part of the analog video monitoring system, its main function is to switch the video image and control the front-end equipment, mainly including ( )
选项：
A: Matrix controller
B: Control keyboard
C: Control code generator
D: Monitor
答案: 【 Matrix controller;
Control keyboard;
Control code generator】
3、多选题：
The display and recording portion of the analog video surveillance system is mainly used to display and record the video signal transmitted by the front-end camera, and the display and recording equipment mainly includes ( )
选项：
A: Monitor
B: Multi-screen divider
C: Multi-screen processor
D: Video Cassette Recorder
答案: 【 Monitor;
Multi-screen divider;
Multi-screen processor;
Video Cassette Recorder】
4、多选题：
The Digital Video Recorder is mainly composed of ( )
选项：
A: Video capture card
B: Coding compression program
C: Storage device
D: Network interface and software system
答案: 【 Video capture card;
Coding compression program;
Storage device;
Network interface and software system】
5、多选题：
The advantage of the digital video surveillance phase ( )
选项：
A: Long recording time
B: Support multiple simultaneous recording
C: Image quality does not deteriorate over time
D: Complex system structure
答案: 【 Long recording time;
Support multiple simultaneous recording;
Image quality does not deteriorate over time】
6、判断题：
In network video surveillance technology, The abbreviation CCTV is a closed-circuit television monitoring system in the stage of analog video surveillance. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
7、判断题：
The main function of the video signal acquisition part of the analog video surveillance system is to compress and encode the information. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
8、判断题：
The signal transmission portion of the analog video surveillance system is responsible for the upstream transmission of the video signal and the downstream transmission of the control signal. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
9、判断题：
The equipment that simulates the signal transmission part of the video surveillance system includes signal transceivers, signal amplifiers, coding compression chips, fiber optic cables, and so on. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
10、判断题：
Digital video surveillance began in the 1990s with a core device: Digital Video Recorder (Digital Video Recorder, DVR). ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
11、判断题：
The product form of the DVR includes PC and embedded, where PC software is built on the Windows (or Linux) operating system, so the structure is single and the performance is stable. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
The function of video encoding compression algorithm is to reduce the amount of video data under the premise of ensuring visual effect as far as possible, which is the premise of the digitalization and networking of video surveillance system. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
The core of video encoding compression is the algorithm, but the implementation of the algorithm is based on the computing processing chip. The algorithm is constantly improving to reduce the flow of code and improve the image quality, at the cost of improving the complexity of the algorithm, but does not require improve the processing power of the chip. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、多选题：
Based on the advent of high-definition network cameras, there are many advantages over traditional analog cameras and ordinary network cameras, including ( )
选项：
A: High definition, megapixel level sensor, and could get more video information;
B: Progressive scanning technology can make the picture clearer, natural and smooth without distortion;
C: Digital head control function, no mechanical parts, more stable and durable;
D: It can replace many ordinary cameras for surveillance, saving cable, installation and maintenance costs.
答案: 【 High definition, megapixel level sensor, and could get more video information;;
Progressive scanning technology can make the picture clearer, natural and smooth without distortion;;
Digital head control function, no mechanical parts, more stable and durable;;
It can replace many ordinary cameras for surveillance, saving cable, installation and maintenance costs.】
2、判断题：
The current status of network video monitoring system is that the coding equipment, platform software, storage and control equipment of different manufacturers cannot be interconnected, and the system needs secondary development and a large number of later integration. Therefore, it is urgent to build an open video management platform to realize zero development interconnection. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
1、多选题：
Typical analog video surveillance system structure includes ( )
选项：
A: Front end: signal acquisition part
B: Middle: Signal transmission part
C: Back end: matrix switching and control part
D: Display and video parts
答案: 【 Front end: signal acquisition part;
Middle: Signal transmission part;
Back end: matrix switching and control part;
Display and video parts】
1、单选题：
The angle of view of the wide-angle lens is above ( )
选项：
A: 20°
B: 30°
C: 40°
D: 50°
答案: 【 50°】
2、判断题：
The main parameters of the camera CCD size refers to the diagonal size of the photosensitive surface of the CCD image sensor, the CCD area is different, the size of the photosensitive point is also different. The photosensitive point is responsible for photoelectric conversion. The larger the area, the weaker the sensitivity to light and the less rich the image hierarchy described. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
3、判断题：
Resolution refers to the image quality index used in the process of video recording, transmission and display, or the inherent screen structure of the display device to express the fineness of the image, that is, the scanning format or display device of the single image signal Pixel specifications. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
4、判断题：
0.25Lx / F1.4 / 50IRE / AGC ON means that the low illuminance of 0.25Lx is measured with F1.4 luminous flux lens and video signal measurement voltage under 50IRE (350mV) and AGC is ON. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
5、判断题：
The camera has a video amplifier that amplifies the signal from the CCD to a "usable level". Automatic gain control (AGC) is to control this video amplifier to weaken the signal under low light and work under strong light, so that the camera can work in a larger illumination range. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
6、判断题：
The focal length of the lens determines the size of the image formed by the subject on the CCD. The shorter the focal length, the smaller the shooting range, and the longer the focal length, the greater the angle of view of the lens. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
7、判断题：
The selected lens should be consistent with the size of the target surface of the camera, and the CCD of the large-size target surface can use a small-size lens, and vice versa. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
8、判断题：
The C-type lens is equipped with a C-type camera, the CS-type lens is equipped with a CS-type camera, and the CS-type lens with a 5mm adapter is equipped with a C-type camera. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
The function of the video distributor is one channel of video input and multiple channels of video output, with the functions of impedance matching and signal amplification. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
The power supply of the network video surveillance system generally requires that the power cord and signal cord be as short as possible. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
The matrix switcher can realize the selection and output of the image of any camera on any designated monitor. Through the keyboard, you can control the front-end camera, lens and auxiliary equipment. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
1、判断题：
The multi-screen splitter still plays back the split screen after playback, and the single-screen playback is as clear as the original image. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
In a multimedia system, it must involve using different color models to represent the colors of an image. For example, the YUV color model is used for computer display, the RGB color model is used in the color TV digitization system, the CMYK color model is used for color printing, and so on. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
2、判断题：
The RGB color model, that is, the three primary colors, 8-bit coding of the RGB three primary colors each constitutes about 167,000 colors, which is what we often say is true color. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
3、判断题：
The YUV color space is composed of a luminance signal Y and two color difference signals and chrominance signals U and V. The separation of Y, U and V is to realize the color signal received by black and white TV. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
4、判断题：
The HSL color model refers to the hue, saturation, and brightness color models, where H represents the wavelength of the color, called Hue, which refers to the purity of the color, or the depth of the color. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
The display resolution of an image is a measure of the density of pixels that make up an image. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
2、判断题：
Pixel depth refers to the number of bits used by each pixel and determines the number of colors that each pixel may have. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
1、判断题：
The premise of data compression is that there is more or less redundant information in the data, and for multimedia information such as video and audio, humans can use their own perceived redundancy (distortion) characteristics to achieve a higher compression ratio. ( )
选项：
A: 正确
B: 错误
答案: 【 正确】
2、判断题：
Human vision is sensitive to color changes and weak to brightness resolution, so video coding algorithms need to make full use of the "weakness" of the human eye for "deceptive" design. ( )
选项：
A: 正确
B: 错误
答案: 【 错误】
1、判断题：
The principle of coding is to convert the codes
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