Battle of the Video Sensors - CMOS Vs CCD

The image sensor is the camera component which captures light and begins the process of turning it into a digital image. There are two kinds of security camera sensors: CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor). Which of the two you opt for depends on your application.

Initially a small background on each and every technologies.

Wtih a CCD sensor, just about every individual pixel's charge is transferred through an output node, which is then converted into an electrical signal. The signal is then buffered and sent as an analog signal. Simply because of the pixels can be devoted to light capture, and the image high quality is usually fairly high.

With a CMOS sensor, just about every individual pixel performs its own charge-to-voltage conversion, and the sensor also performs amplification and noise-correction. The sensor also consists of digitization circuits which permit the chip to output information in a digital format. Because of the complexity of this design, the area devoted to light capture is reduced. And due to the fact every pixel must perform its own conversion, uniformity (thus image good quality) is lower.

The production expense for both kinds of sensors are comparable, but CMOS sensors occasionally call for additional support chips to optimize image good quality. CMOS sensors are great for devices that call for speed and low power consumption, whilst CCD sensors excel in image quality and low light performance.

Although both CMOS and CCD sensors have matured a amazing deal in recent years, when it comes to security cameras, I prefer CCD for outdoor applications and CMOS for indoor IP camera functions. Let me explain why.

In the nonetheless camera globe, CCD and CMOS are pretty much at par in terms of performance. In fact, CMOS sensors are attractive in this space due to the fact of their significantly lower energy requirements - an essential feature for devices which run on batteries. In the security camera world, I come across that CCD sensors outperform their CMOS counterparts in quite a few key metrics.

The very first and most valuable is light sensitivity. If you have to have a security camera with superior night vision capabilities, CCD is the way to go. The CMOS cameras I have tested, with or without having IR illumination, were nearly totally blind in the dark. Cameras with CCD sensors are extremely capable in low light applications, and are terrific when coupled with infrared illumination. If you require to record in low light situations, CCD is the way to go - do not even think about CMOS.

The second factor to contemplate is image good quality. In the security camera world, while both technologies are obtaining closer, CCD still has the edge when it comes to image quality. This is mainly because CCD sensors exhibit less image noise than their CMOS counterparts.

So why would 1 give some thought to purchasing a security camera with a CMOS sensor? Mainly mainly because these sensors are far more prevalent in IP Security Cameras - that is, cameras that are equipped with built in web servers and communicate making use of the IP protocol over CAT5 cabling. These cameras tend to be particularly inexpensive and are terrific for indoor applications that require web based video streaming.

In conclusion, CCD sensors are the way to go for outdoor applications, low light scenarios or when a greater good quality image is necessary. CMOS sensor based cameras must only be regarded as for indoor applications with decent lighting conditions.