The network camera has already been popular at present, among them many common idioms involved still do not understand, we come to understand the security network camera professional technical term explanation now.
Video section
Resolution: divided into display resolution and image resolution. Image resolution refers to the number of pixels contained in one inch. The display resolution refers to the precision of the screen image and refers to how many pixels the display can display. Since the dots, lines, and surfaces on the screen are all composed of pixels, the more pixels the display can display, the finer the picture, and the more information that can be displayed in the same screen area, so the resolution is a very important performance. One of the indicators.
Primary stream/substream: The main stream is used for local storage, and the substream is suitable for images transmitted over low-bandwidth networks. Dual stream uses a high bit rate stream for local HD storage, such as CIF/D1 encoding, and a low bit rate stream for network transmission, such as QCIF/CIF encoding, taking into account local storage and remote network transmission.
Composite streams/video streams: Composite streams transmit audio and video synchronously; video streams only transmit video.
Transcoding Rate/Determining Rate: The transcoding rate is the non-fixed bit rate. The audio encoding software determines the bit rate according to the complexity of the audio data at the time of encoding. This is based on the premise of quality and the encoding of the file size. Fixed size FRAME size is also fixed. A fixed compression coded value is used from beginning to end.
Motion detection: The images acquired by the camera will be calculated and compared by the CPU according to a certain algorithm. The results obtained indicate that the system will automatically perform the corresponding processing. When the picture changes, if someone walks past, the lens is moved and so on.
PIR body sensing: Passive Infrared Detection passive infrared detector or body sensor. People are warm-blooded animals and infrared radiation is also the most stable. We call the PIR detector a passive infrared detector because the detector itself does not emit any energy but only passively receives and detects infrared radiation from the environment. When the body's infrared radiation comes in, focusing on the optical system causes the pyroelectric device to generate an abrupt electrical signal, thereby emitting an alarm. The warning line formed by passive infrared intrusion detectors can generally reach tens of meters.
Activity detection reminder: Based on the motion detection, the PIR body sensing factor is added, that is, the combination of two conditions will trigger the alarm. Reduce false alarms such as curtains and leaves from certain conditions.
Obstruction alarm: As the name suggests, the camera or camera cover is blocked by dust or maliciously concealed by humans. As a result, the quality of the video image is reduced to an indistinguishable degree. The program in the camera alarms in time through an algorithm. Note: This alarm has no video linkage.
Cross-border detection: The perimeter is detected by setting a virtual fence. When a suspicious person or object is found crossing the fence, an alarm is triggered
Applied to: traffic roads crosswalks or zebra crossings; factory area key areas wall; schools; detention center walls and so on.
Area intrusion detection: By setting a certain area (any shape can be set) on the screen as a warning state, when an object is illegally entered into the warning area, an alarm is triggered and the intrusion object is analyzed at the same time. For example, when someone enters the guard zone, the police will report that an illegal person has entered the restricted area; when a car enters the alert area, an illegal vehicle is reported to break into the restricted area.
Applied in: some key protected areas such as bank vaults, scenic spots; prone to dangerous zones; military restricted areas; museums; piers; hospitals, etc.
White balance: The images taken in the room of the fluorescent lamp will appear green, and the scenes shot in the indoor tungsten light will be yellowish, and the photos taken in the shade of the sun will be baffled slightly. The reason is that "White balance" setting. The most common understanding of white balance is that the white image is still white. If white is white, the images of other scenes will approach the human eye's color vision habits. Digital wide dynamic: Clearly preserves details in dark places and suppresses overexposure in bright places under backlight conditions, dramatically improving the image quality of backlit scenes.
3D Noise Reduction: Makes the noise in the night surveillance screen small, and the picture quality is smooth and smooth.
SMART IR: Intelligent image processing technology is used to intelligently adjust the brightness curve by detecting the multi-block brightness of an image so as to prevent overexposure of a certain block image and insufficient exposure of a block image. It can solve the problem of overexposure of infrared light in close range.
Scheduled recording: artificially set a fixed time. After this setting is enabled, the video in the time period will be automatically stored. Divided into all-day video, time period video.
1/3â€: Strictly speaking, it is the specification of the photosensitive element and refers to the area of ​​the CCD/COMS. The larger the area, the more photosensitive dots of the CCD/COMS, and the higher the pixels of the CCD/COMS itself, the same as other conditions. Under the circumstances, the output will be more clear
1/3 inch - target size is 4.8mm wide * 3.6mm high, 6mm diagonal.
1/4 inch - Target dimensions are 3.2mm wide, 2.4mm high, and 4mm diagonal.
Time Lapse: Time-lapse photography refers to taking a picture every other fixed time; then playing the picture in a shorter time, presenting a wonderful and wonderful sight that can not be detected by the naked eye.
Network section
Routers/switches: Interfaces, no essential differences, are all RJ-45 interfaces, but routers have LAN and WAN interfaces with respect to switches, but switches do not. In terms of function, the router is a function of the switch relative to the switch, and the switch is often used to extend the network interface.
The router implements the function of the switch: the network cable from the cat is not inserted into the WAN port, but is inserted into any LAN port to disable the DHCP function of the router.
DHCP: (Dynamic Host Configuration Protocol) is a LAN network protocol. The main role is centralized management, distribution of IP addresses, enabling hosts in a network environment to dynamically obtain information such as IP addresses, Gateway addresses, and DNS server addresses, and can increase the use of addresses.
MAC address binding: Since each network adapter has a unique MAC address, in order to effectively prevent illegal users from stealing network resources, MAC address binding can effectively circumvent the access of unauthorized users. In order to carry out network physical security.
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