OCR (Optical Character Reader)
- Optical Character Reader is an improvement over OMR.
- This can not only detect a mark but can also recognize its shape and identify characters directly from source documents.
- The amount of light reflected differs depending on the shape of the character and the OCR can detect and interpret these minor differences.
- However, documents have to be filled very carefully and character shapes have to be fairly precise.
- This is often done by using machines to print the characters. The presence of any other marks can confuse the device.
- E.g. an electricity bill is printed with all the information required for re-input on a tear-off section.