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技术文摘：CMOS传感器将在安好监控系统中大显本领

Safe supervisory system is occurrent major change: Output of cable, imitate and closed-circuit television system (CCTV) becomes outdated, whole system is transforming to the digital video monitoring that is used at IP network. In such change, CMOS sensor makes the focal point that the industry pays close attention to afresh again. As CMOS sensor of each new science and technology appear, the CMOS image sensor of high quality designs a series of surveillance application easily in the system, and can offer advantage of a lot of science and technology for these systems. These advantages also are consumed in the influence at the same time and business uses a system with safety, created new product opportunity already, upset existing market again. Safe monitoring application passes feeling science and technology to transform to CMOS from CCD for quite a long time, CMOS sensor was become it seems that cheap low qualitative pronoun, to seek result of high quality image, people often can choose more the CCD sensor of higher-priced. Nevertheless, the circumstance is very different however now. Beautiful light (Micron) company bought CMOS sensor pioneer 2001 after Photobit company, entered CMOS sensor area. Continueing while Photobit applies about aerospace and the high-end sensor such as car collision analysis uses science and technology, beautiful light uses his advanced production technology, be in a few years short inside, the CMOS image sensor that makes achieve CCD to resemble element dimension enters the masses to consume the market. Current, of the CMOS image sensor of beautiful light it is OK like character to become reach digital camera level. Paul Gallagher of chief inspector of research and development of this company new market introduces: "Before the picture quality that image conducts feeling science and technology to fall in high temperature can drop considerably. And after using sensor of beautiful smooth CMOS now, below 85 ℃ high temperature picture quality remains the same very outstanding. And the range of CMOS sensor trends of beautiful light is very big, can achieve 100dB. Below enough immediate light illuminate, also won't produce the case that Gao Guangyi gives. " in safe monitoring application, CMOS sensor is to depend on its more low cost, tall compositive spend and outstanding picture quality, replace the CCD sensor that operates so stage by stage. CMOS can come true relatively the low cost of CCD, the reason is become in Yujiji degree taller. According to Gallagher explanation, the need when CCD works assists chip 3 times, need to undertake to outputting signal the format is changed. And fall in same situation, need to operate the CMOS chip of a beautiful light only, this realized odd chip camera actually. He is special point out: "Before, the camera of system of a typical closed-circuit television is in not plan when wiring cost, need 200 to 1000 dollars. And the camera that introduces sensor of beautiful smooth CMOS, after adding wire cable, modem and software, totle drilling cost just 200 dollars. And increase as CMOS sensor crop, this cost still can drop ceaselessly. " the advantage of supervisory system of IP network security that operates CMOS sensor implementation rises as people living standard however, stricter and stricter to the requirement of monitoring, the safe supervisory system that implements through traditional closed-circuit television is cruel showed more and more weakness. In network today, advanced, the safe supervisory system that is used at IP network is replacing closed-circuit television system gradually. And through using sensor of advanced CMOS number image, besides can reduce deploy cost, supervisory system still can gain more advantage: 1. Contractible absorb bulk resembling a head. The volume of hemicycle surveillance probe that former trader handles with closed-circuit television system is very large, achieved 1 cubic metre foot. And use new CMOS to photograph now after resembling a head, bulk is reduced have 1 cubic metre only inch. Because this can install more photographing to resemble a head, eliminate visual blind angle. 2. Raise picture resolution. Level of closed-circuit television system is to go up 30 time establish the century in the light of valve science and technology, the existence such as resolution is restricted, because this cannot be satisfied,look clear at the same time panoramic the demand with close-up. And IP network supervisory system can choose proper resolution according to the particular case of the network. Because use advanced CMOS sensor, picture resolution arrives from original 300 thousand promotion resembling element 3 million above resembling element. And of resolution rise considerably, came true to be caught at the same time panoramic with detail close-up. 3. Increase dependability. Closed-circuit television system should install cloud station, control mobile probe through motor, implementation shakes photograph, a simple move or action and scorch, this raised the possibility of mechanical failure. And in supervisory system of video of IP network number, should hold remotely through rocker only accuse CMOS to photograph like the head, can realize an electron to shake photograph, a simple move or action and scorch. Because need mechanical gearing no longer, because this is reliable,rate rises greatly. 4. Increase a system to appreciate space. Traditional closed circuit system can offer imitate output only. And CMOS image sensor offers digital video output, the number that can use ceaseless development compresses science and technology, storage science and technology and advanced digital processing science and technology, improve systematic function continuously, increase new function. On one page 12 below one page

安好监控系统正在发生重大转变：电缆、模拟输出和闭路电视系统(CCTV)变得过时，整个系统正在向用于IP收集的数字视频监控改观。在如许的改观中，CMOS传感器又从头成为行业存眷的重点。跟着CMOS传感器各项新科技的呈现，高品质的CMOS图像传感器易于设计到一系列看管应用系统中，而且能为这些系统供给良多科技优点。这些优点同时也在影响生产和商用安好应用系统，既缔造了新的产物机缘，又刺激了现有市场。

安好监控应用传感科技从CCD向CMOS改观

长久以来，CMOS传感器似乎成为了重价低质的代名词，为了追求高品质图像成果，人们往往会选择更高价位的CCD传感器。不外，此刻情况却大不雷同。美光(Micron)公司在2001年收买CMOS传感器前驱Photobit公司后，进入了CMOS传感器区域。在继续Photobit无关太空应用和汽车碰撞分析等高端传感器应用科技的同时，美光操纵本身的前进前辈出产工艺，在短短几年内，使达到CCD像素尺寸的CMOS图像传感器进入公共生产市场。

今朝，美光的CMOS图像传感器的成像品质能够达到数码相机级别。该公司新市场研发总监Paul Gallagher介绍：“以往图像传感科技在低温下的图像品质会大幅回升。而此刻采用美光CMOS传感器后，在85℃低温下图像品质仍旧很优异。而且美光的CMOS传感器动静规模很大，能够达到100dB。在充沛的间接光线照射下，也不会发生高光溢出的情况。”

在安好监控应用中，CMOS传感器更是凭借其低本钱、高集成度和出色的图像品质，缓缓代替本来操作的CCD传感器。CMOS之所以能够实现较CCD的低本钱，起因在于其集成度更高。据Gallagher诠释，CCD工作时需要三个辅助芯片，并需要对输出信号进行款式化。而在雷同情况下，只要要操作一个美光的CMOS芯片，这理论上实现了单芯片相机。他特别指出：“以往，一个典型闭路电视系统的相机在不计布线本钱时，需要200到1000美元。而采用美光CMOS传感器的相机，加上线缆、调制解调器和软件后，总本钱才200美元。而且跟着CMOS传感器产量增添，这个本钱还会不竭回升。”

操作CMOS传感器实现的IP收集安好监控系统劣势

然而跟着人们糊口程度进步，对监控的要求越来越严酷，经由过程传统闭路电视实现的安好监控系统暴露出了越来越多的错误真理。在收集化的明天，前进前辈的、用于IP收集的安好监控系统正在逐渐代替闭路电视系统。而经由过程采用前进前辈的CMOS数字图像传感器，除了能够降低安排本钱外，监控系统还能够获得更多劣势：

1．缩小摄像头体积。本来商用闭路电视系统操作的半圆形看管探头体积很大，达到了1立方英尺。而此刻采用新的CMOS摄像头后，体积减小到只有1立方英寸。是以能够安置更多的摄像头，消除视觉死角。

2．进步图像分辨率。闭路电视系统尺度是上世纪30年月针对电子管科技而设立的，分辨率等存在限度，是以不克不迭满足同时看清全景和特写的需求。而IP收集监控系统能够按照收集的具体情况选择合适分辨率。因为采用前进前辈的CMOS传感器，图像分辨率从本来的30万像素晋升到300万像素以上。而分辨率的大幅进步，实现了同时捕捉全景和细节特写。

3．增添靠得住性。闭路电视系统要安置云台，经由过程马达节制挪动探头，实现摇摄、俯仰和变焦，这增添了机械故障的可能性。而在IP收集数字视频监控系统中，只要经由过程摇杆远程操控CMOS摄像头，就能够实现电子摇摄、俯仰和变焦。因为不再需要机械传动安装，是以靠得住程度大大进步。

4．增添系统贬值空间。传统的闭路系统只能供给模拟输出。而CMOS图像传感器供给数字视频输出，能够操纵不竭成长的数字压缩科技、存储科技和前进前辈的数字措置科技，继续进步系统的性能，增添新的性能。
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发布日期：2009-8-4　【返回】