Network camera from which parts?

Network camera from which parts?
Network Camera consists of two parts: the camera function components (lenses, filters, image sensor) and related parts and computer functions (video encoders, network servers, external alarm and control interface). Wherein associated with the camera function unit for capturing an image (a variety of different wavelengths of light) and converting it into an electrical signal. These electric signals are actually or analog signals, they will be further converted into a digital signal and the transmission member to give the computer functions by the member for compression and then transmitted through the network out.
1.A camera lens
The front part of the camera lens as a IP Camera, fixed iris, auto iris, auto zoom, auto zoom and other types of analog cameras.
2. filters
Filters, the Scientific Name optical low pass filter, the main filter function as follows:
1) filter out infrared: color CCD sensor infrared DSP can not calculate the correct color of the image, resulting in a color color distortion, in order to ensure that the camera color distortion, it is required to add a filter to filter out the infrared part of the light.
2) trimmed into the light: Camera CCD is constituted by a dolphin photoreceptor (CELL), for fear of interference to neighboring photoreceptor so the incident light correction, leaving only the direct light of the incident light. Camera filters commonly used quartz plate, quartz with physical polarization characteristics of the quartz can keep a direct part of the incident light is reflected off the oblique portion of the incident light, so you can avoid the oblique incident light affect the photosensitive next point.
3. image sensor and sound sensor
CMOS and CCD image sensor in two modes.
The CMOS image sensor is complementary metal oxide semiconductor, CMOS semiconductor is made of the use of silicon and germanium, these two elements, by the negatively charged and positively charged CMOS transistors to implement the basic functions. The current generated by these two complementary effects can be processed chip recorded and interpreted as images. CMOS CCD main advantage is the very low power consumption, about 1/3 of the power consumption of CMOS image sensor only ordinary CCD, CMOS important issue is dealing with rapidly changing images, the current transformation too often and overheating. Little dark current suppression of the question, if the suppression of bad will be very prone to noise.
The CCD image sensor constituted by two-dimensionally arranged on a monocrystalline silicon substrate Movement of the photodiode and its transmission circuit. Photodiode light transforming into a charge, and then sent by the conversion circuit and the output.
Typically, devices that deliver excellent image quality CCD image sensor, select CMOS image sensor and focus on power consumption and cost of products. But the new technology is to overcome the inherent weaknesses of each body, while retaining certain characteristics suitable for a particular purpose. This section is the same as the analog camera.
Sound sensors that pick up the sound or microphone, the microphone principle.
4. A / D converter
The function of the A / D converter is to convert analog signals into digital signals for the image and sound.
5. images, audio encoder
Image after A / D conversion, the digital sound signal, according to a certain format or standard compression encoding. The purpose of the compression coding in order to facilitate the realization of the audio / visual signal and the digitized multimedia signal; facilitate transmission of said signal in a computer system, network, and on the World Wide Web without distortion.
At present, image coding compression technology, there are two: one is Hardware compression is about coding compression algorithm curing on the chip; another is based on the DSP software coding, image coding and compression software running on the DSP. Similarly, the compression of the sound we can use hardware encoding compression and software compression coding standard MP3 format.
6.Controller
The controller is the heart of the IP Camera, its role is the management and control of the network camera. If hardware compression coding controller is an independent member; If software compression coding, the controller runs the encoding compression software DSP, i.e. the two together.
7 network server
Network server network camera network function, it uses RTP / RTCP, UDP, HTTP, TCP / IP network protocol, allowing users from their PC using a standard browser based on the IP address of the IP Network Camera access, view real-time images and control the camera lens and head.
8 external alarm control interface
Network camera for engineering applications the practical external interfaces, such as control PTZ 485 for the alarm signal input and output I / O port. Infrared probe target, an alarm signal to the IP cameras, network cameras automatically adjust the direction of the lens, and real-time video; On the other hand, when the IP network camera detects moving target, but also sent out an alarm signal.
From:http://www.vstarcam.com/channel/Network-camera-from-which-parts--89.html