Network Video Surveillance Technology - 长安大学 - 学堂在线
1.多选题 (2分)
Based on the advent of high-definition network cameras, there are many advantages over traditional analog cameras and ordinary network cameras, including()
AIt can replace many ordinary cameras for surveillance, saving cable, installation and maintenance costs.
BProgressive scanning technology can make the picture clearer, natural andsmooth without distortion;
CDigital head control function, no mechanical parts, more stable and durable;
DHigh definition, megapixel level sensor, and could get more video information
正确答案：A,B,C,D (少选不得分)
2.多选题 (2分)
Typical analog video surveillance system structure includes ()
AFront end: signal acquisition part
BDisplay and video parts
CBack end: matrix switching and control part
DMiddle: Signal transmission part
正确答案：A,B,C,D (少选不得分)
3.多选题 (2分)
Dynamic video compression, that is, there is "opportunity" for redundant data, lies in()
ASpatial redundancy
BTime redundancy
CVisual redundancy
DThinking redundancy
正确答案：A,B,C (少选不得分)
4.多选题 (2分)
Generally, the video coding algorithm divides the input CIF video into a series of "block" based hierarchies, including:()
AGOB
BMB
CBlock
DPicture
正确答案：A,C,D (少选不得分)
5.多选题 (2分)
The core functions of DVR are ()
ACode compression
BNetwork transmission
CDigitalization of analog audio and video
DStorage
正确答案：A,C,D (少选不得分)
6.多选题 (2分)
As can be seen from the composition of DVR, apart from the computer system equipment as the basic load, such as CPU and memory, there are two main core chips necessary for DVR: ()
AHard disk
BNetwork card
CBack-end processing chip
DA / D chip
正确答案：C,D (少选不得分)
7.多选题 (2分)
DVR configuration and interface need to consider the following elements: ()
ANumber of video input and output
BAlarm interface, etc.
CSupport resolution
DNumber and capacity of hard disks
正确答案：A,B,C,D (少选不得分)
8.多选题 (2分)
When deploying an NVR project, you first need to understand the specific characteristics of the project, including:()
AIndustry characteristics and special needs of users
BNumber of cameras, distribution of points
CStorage system architecture
DNetwork construction, etc.
正确答案：A,B,C,D (少选不得分)
9.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：A
10.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：B
11.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：A
12.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：B
13.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：A
14.单选题 (1分)
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. ()
Aright
Bfalse
正确答案：A
15.单选题 (1分)
The principle of coding is to convert the codes that are used many times into codes with a long length, while those with few usages can use shorter codes, and keep the codes only solvable. ()
Aright
Bfalse
正确答案：B
16.单选题 (1分)
In JPEG encoding, before the DCT change of the image, the color mode conversion of the image is required. JPEG is required to be performed in the RGB color mode. ()
Aright
Bfalse
正确答案：A
17.单选题 (1分)
Since the I-frame image needs to refer to other image frames, the information of this frame is not used for encoding, so the amount of data is small. ()
Aright
Bfalse
正确答案：B
18.单选题 (1分)
The advantage of MPEG-4 technology is that it treats images equally. ()
Aright
Bfalse
正确答案：B
19.单选题 (1分)
Compared with PC-type DVR, embedded DVR has an advantage in that it has a friendly interface. ()
Aright
Bfalse
正确答案：B
20.单选题 (1分)
In DVR application of digital-analog hybrid architecture,DVR is generally only used as an independent video recording device. ()
Aright
Bfalse
正确答案：A
21.单选题 (1分)
PC-type and embedded DVR, common common common fault is loose board ()
Aright
Bfalse
正确答案：B
22.单选题 (1分)
Video encoder is also called video server, or DVS(Digital Video Server) for short. It is mainly used to encode and compress analog video signals and provide network transmission function.The difference with DVR products is that DVS focuses on the "video recording" function. ()
Aright
Bfalse
正确答案：B
23.单选题 (1分)
DVS can be seen as a transition product of video surveillance system from analog era to network era. Using DVS, you can upgrade to network system without abandoning the existing analog equipment. ()
Aright
Bfalse
正确答案：A
24.单选题 (1分)
Compared with DVR, DVS is not suitable for application in projects with scattered points. ()
Aright
Bfalse
正确答案：B
25.单选题 (1分)
The application mode of combination of matrix and DVS is mainly applied to the upgrading of the original analog video monitoring system. ()
Aright
Bfalse
正确答案：A
26.单选题 (1分)
The architecture of "DVS+NVR" is a network video monitoring system composed of part of digital and part of analog, which is generally adopted for newly-built projects. ()
Aright
Bfalse
正确答案：B
27.单选题 (1分)
NVR, the full name of Network Video Recorder / Network Video Recorder, is the storage and forwarding part of the network video surveillance system. NVR works with the video encoder () or network camera to complete the video recording, storage and forwarding functions. ()
Aright
Bfalse
正确答案：A
28.单选题 (1分)
NVR is a network-based all-IP video surveillance solution, but it cannot be deployed anywhere on the network due to physical location constraints. ()
Aright
Bfalse
正确答案：B
29.单选题 (1分)
IPC, IP Camera, is a real IP monitoring device. The most important feature is that the Camera supports the network protocol. ()
Aright
Bfalse
正确答案：A
30.多选题 (2分)
The camera has a video amplifier that amplifies the signal from the CCD to a "usable level". Automatic gain control () 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. ()
Aright
Bfalse
正确答案：A,B (少选不得分)
31.单选题 (1分)
From the external situation, IPC is integrated into video acquisition, image processing, video and audio coding and compression, network transmission, control, alarm and other functional modules on a circuit board to achieve video coding and uploading. ()
Aright
Bfalse
正确答案：A
32.单选题 (1分)
In IPC's independent chip + CPU architecture, the coding and compression work is done on the same chip as the system master. ()
Aright
Bfalse
正确答案：A
33.单选题 (1分)
CCD sensor is poor in terms of sensitivity and image quality. The reason is that each pixel of CCD needs an A/D, which reduces the photosensitive area of each pixel. In addition, the use of pixel equivalent A/D converter will also cause high noise interference.()
Aright
Bfalse
正确答案：B
34.单选题 (1分)
CMOS based image sensor is generally built with A/D module, which can output digital signals directly, so no analog/digital converter is needed. The image sensor module based on CCD mode needs an independent A/D conversion device. ()
Aright
Bfalse
正确答案：A
35.单选题 (1分)
IPC has a hardware coding compression mode, that is, the coding compression algorithm is solidified on the chip. ()
Aright
Bfalse
正确答案：A
36.单选题 (1分)
Different companies use different imaging devices, different chips, and different compression algorithms, resulting in IPC devices with very different performance. ()
Aright
Bfalse
正确答案：A
37.单选题 (1分)
IPC is similar to DVS in that one of IPC's weaknesses is that it is too dependent on the network, so it needs IPC to have temporary local video data storage capacity.()
Aright
Bfalse
正确答案：A
38.单选题 (1分)
Alarm frame rate change technology refers to that IPC adopts low resolution and frame rate to record video in normal state, but once an event or alarm occurs, the system automatically switches to high resolution and frame rate to record video, which can save a lot of storage resources and ensure high quality recording of important videos.()
Aright
Bfalse
正确答案：A
还木有评论哦，快来抢沙发吧~