Flatbed+Scanner

A flatbed scanner is a peice of machinery made up of a glass pane, a bright light, light sensors and light filters.

A flatbed scanner is usually made up of a glass pane, where underneath is a moving charged coupled device (CCD) and a bright light (normally xenon or cold cathode fluorescent) which lights up the pane of glass. Scanners with CCD have three rows of sensors with red, green and blue filters. Or there is contact image sensor (CIS) which has a moving set of red, green and blue LEDs. The image that is to be scanned is put face down on the glass, then an opaque cover is put on the top to exclude ambient light. The sensor array and bright light move across the pane, reading the entire area. An image is formed due to the light reflected back on to the sensors.

=__ Flatbed scanner __=

a flatbed scanner consists of a glass pane and underneath, a light which illuminates above. several light detecting sensors are set across the glass pane and move slowly. when the light is on the glass pane, it is converted to an electrical signal. these scanners usually consist of three different rows of sensors which have red, blue and green filters that are used to measure the colour intensity of the primary colours reflected in the light. then the digital copy of the image is completed and stored in the computer attached which then processes it.