2D scanners

Question 1

What are 2D scanners used to do?

Answer 1

They are used to convert a hard/paper copy document or photograph into a computer-readable format.

Question 2

How do 2D scanners operate (step by step)

Answer 2

• a bright light will illuminate the document to be copied\
• a head moves across the document scanning it to produce an image which is sent to a lens
• the focused image then falls on to a light-sensitive sheet made up of thousands of pixels which record the light intensity or colour falling on each pixel
• this information is now stored as an image in the computers memory

Question 3

How can 2D scanners help security cameras use face recognition?

Answer 3

Specialist software measures and compares the proportions of a person’s face with those stored.

Question 4

What kind of things can 2D scanners help produce?

Answer 4

Passports