➝ Mouse :- It is hand help pointing device i.e, move across the flat surface and it's movement controls the movement of mouse pointer on the screen.
There are three buttons in a mouse -----
✳️ Left or Selection Button :- This button is used to select anything on screen.
✳️ Middle or Scroll Button :- With this button we can move around the page quickly.
✳️ Right or Shortcut Button :- When we press this button, it displays a shortcut list of related window.
➝ Joystick :- It is a pointing device which is used to play game on computer or any other display devices.
➝ Light Pen :- This device used to draw a line directly on screen.
➝ Track Ball :- It is also a pointing device in which we rotate the ball to move the cursor.
➝ Scanner :- It is very similar to the photocopy machine which is used to scan or create text or image into the computer. The basic function of a scanner is to convert hard copies into soft copies.
Scanner are of two types -----------
✳️ Image Scanner
⟶ Hand held
⟶ Flatbed
✳️ Special Purpose Scanner
⟶ MICR (Magnetic Ink Character Recognizer)
⟶ OCR (Optical Character Recognizer)
⟶ BCR (Bar Code Recognizer)
⟶ OMR (Optical Mark Recognizer)
Special Purpose Scanner -----
⟶ MICR :- It is used in banks to check demand drops and cheques.
⟶ OCR :- It is used to recognize written hand text or typed text.
⟶ BCR :- It is used in shopping complex and super market to read the coded price of an item.
⟶ OMR :- It is used to detecting the presence of intended marked response.
Great..!!
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