What are the types of images sensors on IP cameras and how are they different?
There are two main types of image sensor technologies are available for use in network cameras:
- CCD (charge-coupled device)
- CMOS (complementary metal-oxide semiconductor).
Each has its own unique strengths and weaknesses that make them appropriate for different applications.
CCD sensors have been used in cameras for more than 20 years and present many advantageous
qualities such as good light sensitivity, which is important in low-light conditions. However, they are more expensive and more complex to incorporate into a camera and may consume much more
power than an equivalent CMOS sensor.
Recent advances in CMOS sensors bring them closer to their CCD counterparts in terms of image quality. CMOS sensors lower the total cost for cameras since they contain all the logics needed to build cameras around them. CMOS sensors enable more integration possibilities and more functions. They make it possible for manufacturers to produce smaller-sized cameras. The most common image sensor sizes used in network cameras are ¼-inch and 1/3-inch and they may use progressive scan or interlaced scan technology (see next point below for more on the technologies). Many megapixel sensors are the same size as sensors used in cameras that deliver VGA 640×480 resolution. It means that the megapixel sensor has many more pixels but the pixel sizes are smaller, and therefore, less light sensitive than a non-megapixel sensor