Chapter 4 Input Learning Objectives Define Input and
Chapter 4: Input
Learning Objectives Define Input and list the two types. List the areas on a keyboard. List the three ways commands can be entered in an application. Explain what a pointing device is, how it works and give examples. Explain different pointing device operations. Explain voice recognition. Define video input and list two device used to obtain video.
Learning Objectives Explain what a scanner is and list examples. List and define other systems used to input information into computing devices. List types of biometric input. List input devices for physically challenged users
Input Data or instructions entered into memory of computer Input device is any hardware component used to enter data or instructions
Input – Two Types Data ◦ Unprocessed text, numbers, images, audio, and video Commands ◦ Programs ◦ Commands ◦ User Responses
The Keyboard Function Keys Typing Area Arrow Keys Numeric Keypad
The Keyboard Many applications allow for alternate ways to complete a command using buttons menus and key commands Icon Key Combination Command Menu Item Copy Edit/Copy Ctrl + c Open File/Open Ctrl + o Paste Edit/Paste Ctrl + v
The Keyboard - Standard
The Keyboard - Ergonomic
The Keyboard - Wireless
The Keyboard - Notebook
The Keyboard – Handheld
Pointing Devices Any device that controls the movement of the pointer on a display device. The pointer on the screen can take several different forms block arrow pointing hand I-beam
Pointing Devices – Mechanical Mouse Movement of mouse translates into signals computer understands X axis Y axis
Pointing Devices – Optical Mouse No moving mechanical parts inside uses light to detect mouse’s movement More precise than mechanical mouse
Pointing Devices – Common Mouse Operations Point Click Doubleclick Drag Rightdrag Rotate Wheel Press Wheel Button Trippleclick Rightclick
Pointing Devices – Trackball Stationary pointing device with a ball on its top To move pointer, rotate ball with thumb, fingers, or palm of hand
Pointing Devices – Touchpad A small flat rectangular device that is sensitive to pressure and movement
Pointing Devices – Pointing Stick A small eraser shaped object located between the keys on a keyboard. Used in IBM book computers.
Pointing Devices – Touch Screen A monitor with a pressure sensitive surface Used in IBM book computers. Used in kiosks or independent learning systems.
Pointing Devices – Stylus A stylus is used hand writing recognition software and special touch sensitive screens convert writing to characters a computer can recognize Is used to create electronic signature systems. Can be a iffy system when used to capture information for computer applications.
Pointing Devices – Stylus/Graphic Tablets Looks like a ballpoint pen, but uses pressure to write text and draw lines
Voice Recognition A systems that capture speech and convert it to recognizable computer data.
Digital Camera Digital cameras work in the same way that a film camera works. The difference between the two is what you find inside.
Video Input Process of entering full-motion images into computer Video can come form; ◦ Digital Video Recorders ◦ Web Cams
Scanners Light-sensing device that reads printed text and graphics Used for image processing, converting paper documents into electronic images
Scanners – Four Types Flatbed Pen or Handheld Sheetfed Drum
Other Input Devices. Optical Readers Device that uses light source to read characters, marks, and codes and then converts them into digital data
Optical Character Recognition (OCR) Optical character recognition (OCR) reads characters in OCR font Also a term for converting printed documents into electronic documents using a scanner.
Optical Mark Recognition (OMR) Optical mark recognition reads hand-drawn pencil marks, such as small circles
Bar Codes A identification code that consists of a set of vertical lines and spaces of different widths The most recognized bar code is the UPC
Bar Codes Number system character identifies type of product Manufacturer identification number (Kellogg’s, in this case) Check character verifies accuracy of scanned UPC symbol Item number (10 oz. box of Froot Loops
Bar Codes
Magnetic-Ink Character Recognition (MICR) Banking industry almost exclusively uses MICR for check processing
Biometric Input Authenticates person’s identity by verifying personal characteristic ◦ ◦ ◦ Fingerprint scanner Hand geometry Voice verification Iris recognition Facial recognition
Input Devices for Physically Challenged Users There a number of devices available for the physically challenged to use the PC. ◦ keyguard for limited hand mobility ◦ onscreen keyboard ◦ speech recognition ◦ pointing device for those with motor disabilities
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