An outdoor security camera, like all cameras, uses an image sensor made up of many pixels which registers the amount of light and converts it to the corresponding number of electrons. The brighter the light, the more electrons are generated. There are two main technologies used for the camera's image sensor.
The first is known as the CCD sensor which is an acronym for charge-coupled device, and the second is the CMOS sensor which is spelled out as the complementary metal-oxide semiconductor. Even though these two types are viewed a rivals, each has its own strengths and weaknesses so one would be better than the other in different applications.
CCD sensors were developed specifically to be used in cameras and for the purpose of capturing images. CMOS sensors were developed off standard technology already in use, such as memory chips in computers. However, CMOS sensors today are being developed further for the purpose of being in cameras and the image quality it provides is improving.
CCD sensors are still slightly better in light sensitivity and produce cleaner images than CMOS sensors. Because of higher light sensitivity, the CCD produces sharper images in low light conditions than CMOS sensors.
The downside is that CCD sensors are more expensive and harder to build into a camera. Also, a CCD sensor uses much more power, in some cases 100 times more, than the equivalent CMOS sensor.
In contrast, the CMOS sensors are quickly over taking the areas that CCD sensors once ruled in terms of image quality. CMOS based cameras always had the edge when it came to cost. It is much easier to build a camera around a CMOS sensor.
Relative to the CCDs, CMOS sensors are more flexible to integration possibilities and functions and have a faster readout. They also require less energy and require a smaller system size. Megapixel CMOS sensors are much more common commercially than megapixel CCD sensors and much less expensive.
In megapixel cameras, the sensors contain over one million pixels, hence the name. To reduce the cost, the sensors are around the same size as VGA sensors meaning the size of each pixel is reduced greatly. This smaller size allows the camera to produce high resolution images with more details but also makes the camera less light sensitive. Since each pixel is smaller in size, and the light reflected from the object is spread across more pixels, it requires better lighting conditions to produce an image.
The first is known as the CCD sensor which is an acronym for charge-coupled device, and the second is the CMOS sensor which is spelled out as the complementary metal-oxide semiconductor. Even though these two types are viewed a rivals, each has its own strengths and weaknesses so one would be better than the other in different applications.
CCD sensors were developed specifically to be used in cameras and for the purpose of capturing images. CMOS sensors were developed off standard technology already in use, such as memory chips in computers. However, CMOS sensors today are being developed further for the purpose of being in cameras and the image quality it provides is improving.
CCD sensors are still slightly better in light sensitivity and produce cleaner images than CMOS sensors. Because of higher light sensitivity, the CCD produces sharper images in low light conditions than CMOS sensors.
The downside is that CCD sensors are more expensive and harder to build into a camera. Also, a CCD sensor uses much more power, in some cases 100 times more, than the equivalent CMOS sensor.
In contrast, the CMOS sensors are quickly over taking the areas that CCD sensors once ruled in terms of image quality. CMOS based cameras always had the edge when it came to cost. It is much easier to build a camera around a CMOS sensor.
Relative to the CCDs, CMOS sensors are more flexible to integration possibilities and functions and have a faster readout. They also require less energy and require a smaller system size. Megapixel CMOS sensors are much more common commercially than megapixel CCD sensors and much less expensive.
In megapixel cameras, the sensors contain over one million pixels, hence the name. To reduce the cost, the sensors are around the same size as VGA sensors meaning the size of each pixel is reduced greatly. This smaller size allows the camera to produce high resolution images with more details but also makes the camera less light sensitive. Since each pixel is smaller in size, and the light reflected from the object is spread across more pixels, it requires better lighting conditions to produce an image.
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