Computer imaging concepts 5.
Detectors/sensors.
Three components needed for obtaining digital images:
1. Detector or sensors- A device to capture incoming light, as in an introral camera (video camera) or a digital still cameras, or an x-ray beam, and converting either of these energy sources to an electronic signal.
The
most common type of image detector is the charged-coupled device (CCD), complementary
metal-oxide semiconductor (CMOS) or charge
induction device (CID).
This is made of silicon and when light or x-rays hit this an electrical charge
is created. This analog signal is converted to a standard video signal which is
digitized to create the digital image (ADC).
-CMOS and CIDS are about half the price of the CCD, but many consider the CCD producing better quality images.
2. Computer- This serves as the method to control image acquisition, storage, processing, retrieval and display of the digital image.
3. Software to convert analog image into a digital one.