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    DEVICES OF A COMPUTER

                     As you know, a computer works in three steps: input  process  output.

                       Input is any data or instruction entered into a computer. The input devices help us enter
                       data and give commands to the computer.
                       Process refers to the work done by the computer with the help of the processor.

                       Output refers to the result that has been processed by the CPU.

                     We use different devices for each step. Let us learn about these devices in detail.

                     INPUT DEVICES
                     We have already read about some of the commonly used input devices in earlier classes.
                     Let us now learn about a few more here.

                     Gesture Recognition Camera

                     A gesture recognition camera is a motion input device. Motion
                     input lets  the  user  guide  the  on-screen elements  using  air
                     gestures. Air gestures involve moving your body or a handheld
                     input  device through the  air. With  motion  input,  a device
                     containing a camera detects your gestures and then converts
                     them to a digital signal that is sent to a computer or game device. For example, gamers

                     can pull their arm back to throw a javelin in the game.

                                         Barcode Reader
                                         A Barcode reader or barcode scanner is an electronic device, used for

                                         reading printed barcodes. Barcode readers consist of a light source, a
                                         lens and a light sensor that help them scan these codes.

                     Optical Mark Reader (OMR)
                     Optical Mark Reader is  an input  device  used  for
                     capturing human-marked data in document forms
                     such as tests and surveys. OMR is used in schools,
                     businesses  and  healthcare  agencies  for data input

                     processes and to reduce input errors.

                                                  Optical Character Reader (OCR)
                                                  Optical Character Reader is used to carry out a mechanical or

                                                  electronic translation of handwritten, typewritten or printed text
                                                  into machine-encoded text. It is widely used to convert books
                                                  and documents into electronic files. OCR can also be attached to
                                                  scanners and mobile phones.

                                                                                             Fundamentals of Computer  13

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