Input and output devices Flashcards
What are input devices?
Input devices allow interaction with a computing system through standard interfaces like a mouse or keyboard, or advanced interfaces like Microsoft’s Kinect.
What is Optical Character Recognition (OCR)?
OCR converts printed media into editable text documents using a scanner, allowing users to change sections of text on printed documents.
How does OCR work?
OCR performs pattern matching by scanning the image for recognizable shapes as letters, numbers, or symbols, comparing binary data to an internal database.
What is a limitation of OCR?
OCR can sometimes get it wrong, so the resulting document must be proofread.
What is Optical Mark Recognition (OMR)?
OMR detects dark marks on predefined forms, commonly used for multiple choice exams and registers.
How does OMR determine user selections?
OMR accepts only one mark if two are made in the same section and may miss marks that do not fully cover the designated area.
What is Magnetic Ink Character Recognition (MICR)?
MICR uses iron oxide ink and specific fonts, allowing data written with this ink to be read by a specialist MICR reader.
What is a primary use of MICR?
MICR is almost exclusively used for cheques, enabling quick processing by banks.
What are touch screens?
Touch screens are interfaces popular in modern devices, sending X and Y coordinates of touches to the operating system.
What are the two types of touch screens?
The two types are Resistive and Capacitive touch screens.
How do resistive touch screens work?
Resistive touch screens consist of two transparent sheets that record voltage when touched, requiring pressure to register a touch.
What are the advantages of capacitive touch screens?
Capacitive touch screens provide sharper images and can register multiple touch points simultaneously.
What is a limitation of capacitive touch screens?
Capacitive touch screens cannot be used with gloves or non-conductive items like pens.
