Scanner changed the important files life
Computer scanners or optical scanner take images and turn them into signals that a computer can understand. Although image scanners did exist prior to the invention of the charge-coupled device (CCD) most modern scanners now capture images in this way.
A scanner houses an array of CCD’s for capturing light. When a photograph or book is scanned, a lamp illuminates the image which is then reflected by a series of mirrors and focused through a lens to reach the CCD array. The CCDs create an analog signal which is then converted to a signal that can be read by a computer and stored. More recently, manufacturers have started to use different technology-The Contact Image Sensor (CIS) method which reflects light from Lighting Emitting Diodes (LEDs), instead of from a normal lamp and receives it via a sensor. Despite producing lower quality imagery, CIS technology is cheaper and is used in portable scanners.
Scanning has moved up a dimension since the 1970s. Artist and architects can now use sophisticated scanners, some incorporating the latest laser technology to generate 3D computer models of objects that they want to integrate into their designs. Film production companies also use 3D scanners to generated imagery and taking their inspiration from nature’s physical forms.
Modern scanners are considered the successors of early telephotography and fax input devices.