PK analog cameras HD network camera

As a traditional analog cameras Bazhe camera industry, but is gradually being fashionable high-definition network camera replaced. There is certainly every reason for its existence. HD network cameras are gradually eroded gradually disappearing analog cameras, this is due to congenital deficiency of traditional analog cameras caused. Traditional analog cameras and high-definition network cameras compared to traditional analog cameras can only be one-way transmission of video signals, the igogo
performance of the play by the DVR and operator level restrictions, but high-definition network camera can transmit full-duplex digital information and to other

devices within the system to effectively integrate, so that they can in a distributed, scalable action shot cameras environment to achieve higher levels of performance. This is a traditional analog cameras can not match. HD network cameras can communicate with multiple applications in parallel, in order to achieve various functions, such as detecting the movement of the screen, or send different video streams and so on. HD analog cameras and traditional analog cameras compared as follows: Resolution: born out of the old traditional analog camera analog TV reason, the original resolution is limited by the standard analog TV, PAL, the vertical resolution of 625 lines, to go after blanking 575 lines up to 540 lines or so already is the limit. Traditional analog cameras up to D1 or 4CIF resolution can be achieved, or about 400,000
pixels, while high-definition network camera is no such limit, you can easily reach one million pixels or even ten million pixels. Color reproduction: Analog composite analog video camera output signal contains luminance signal and color signal, and the luminance signal and the color signal in the same frequency range. However, composite video transmission to the video capture chip, the video capture chip in addition to doing A / D conversion, but also do bright separation, because it is difficult to completely separates the luminance and color signals, so we often find traditional analog video surveillance prone to color penetration and miscellaneous color phenomenon. The digital HD camcorder is no bright separation troubles, color can do more realistic. Analog transmission: the traditional analog cameras to be remotely transmit analog signals, prone to weak electromagnetic signals. Complex environment of the scene, while the analog signal itself is susceptible to
electromagnetic, thunderstorms and other external factors interfere, can often be seen moving up and down transfer images back ripples, flicker, snow point and so on. Also be transmitted to the DVR A / D conversion, A / D conversion process is also lost a lot of picture detail and quality. Therefore, D1 resolution analog video only theoretical values, in practice it will not achieve the resolution level of theoretical values. The definition network camera is used throughout the pure digital igogo

signal processing and transmission, it will first CMOS image sensor to the optical signal is stop action camera directly converted into progressive progressive scan digital signal is
then transmitted to the DSP or ASIC chip dedicated for video image compression encoding, and finally through the network the digital compressed video output. Since the
whole process is all digital, so digital cameras in resistance to electromagnetic interference, progressive scan, screen resolution and have a traditional analog cameras can not match advantage. With the economic and technological development, the price of high-definition network camera also increasingly the trend towards civilians. Is gradually replacing the traditional analog cameras HD network camera from its independence day thick advantages, will become the leading high-definition security surveillance cameras civilians king