Chapter 6 Input and Output Devices

Types of Scanners

- Flatbed - Sheet-fed - Handheld

Examples of Input Devices

- Keyboard - Mouse - Track-Pad - Joy stick - Touch Screen - Light Pen - Scanner - Digital Camera - Microphone - Graphic Tablet - The most common is touch screen, keyboard, and mouse

Types of Mouses

- Mechanical Mouse - Optical Mouse - Wireless Mouse - Track Ball - Joy Stick - Track Pad - Track Point - Touchscreen - Microphone

Recognition Types

- OCR - OMR - MICR

Handheld

- a small, lightweight, and portable scanner - it is used to scan small amount of data such as short articles from newspapers - it is held in hand and is moved over the text page or image slowly and smoothly from start to end - scan quality may be lower than the others however, it can be used to capture small amounts of text or small images, quickly - a mobile device such as cell phone is an example of one

OCR - Optical Character Recognition

- a special preprinted set of characters that can be read by light source and changed into machine-readable form - it is typically used in departmental stores to read retail price tags by reflecting light

Wireless Mouse

- a type of mouse that does not require a wire to work - it transmits data using wireless technology like radio waves such as Bluetooth or infrared light waves - batteries may be needed for the power - the receiver is connected to the computer through a USB port -- this will be a plug-in n play devices most operating system will recognized the driver

Flatbed

- a type of scanner or copier that uses a flat, glass surface for scanning documents or other things - consisting of a light source, a lens, and a light sensor translating optical impulses into electrical ones - most have an adjustable lid that can be raised to allow magazines, books, and other thick objects to be scanned

Joy Stick

- all game controllers that are connected to a computer are considered a pointing device - the Nintendo Wii control can be can be considered as a pointer device, it is used to control motion of an object quickly in game with the help of a hand held remote control - For a stand controller such as what is displayed in the above image the stick portion is mounted on a ball -- When it is moved then the ball is moved and signals are sent to the computer

Track Point

- also known as the pointing stick, it's a small rubber projection embedded between they keys of the keyboard - some notebook computers such as IBM ThinkPad will incorporate a pointing stick - the pointing stick acts like a little joystick that can be used to control the position of the on-screen cursor

Scanner

- an input device that captures the image of any printed page or graphic by digitizing it, producing an image made of tiny pixels of different brightness and color values and then can be stored electronically or as a digital file on the computer hard drive or an external storage device - there are three types of character and mark recognition devices -- the technology used for this are able to recognize special characters, marks, and drawings - these type of devices are used at banks or markets

Microphone

- an input device used to enter sounds into the computer - it can be attached to a computer to record sound (usually through a sound card built into the motherboard) - the sound is digitized and turned into umbers that represent the original analog sound waves, which then stored in the computer so as to process and playback later

Output

- any data that has been processed into something that is useful or meaningful - it can be displayed in many forms such as text, graphics, audio, and video - text _____ is the most complex -- text may include characters (general term for letters, numbers, punctuation marks, and any other symbol) - most common medium of this is the display screen (monitor)

CRT Monitor

- cathode ray tube that uses an electron beam of varying strength to "paint" a picture onto the color phosphorescent dots on the inside of the screen - heavy and use more electrical power than flat panel displays, but they are preferred by some graphic artists for their accurate color rendition, and used to be preferred by some gamers for faster response to rapidly changing graphics

Mechanical Mouse

- contains a rubber or metal ball inside it - the movement of the cursor depends on the movement of the ball - this mouse is normally used on mouse pad. -- mouse pad is a small flat pad made of rubber or foam to provide easy movement for the mouse -- it protects the mouse from dust and dirt and relieves traction - the _________ mouse has been replaced by the optical mouse.

Touchscreen

- the user can make choices and press button images on the screen - in ATM and in the latest smart phones, these are used to receive input from the user -- the user enters data by the touch of his or her finger on different menu options or icons presents on this

MICR - Magnetic Ink Character Recognition

- this is used by banks worldwide to read numbers written on checks and money orders - a special-purpose machine reads characters made of ink containing magnetized particles

Sheet-Fed

- works like a fax machine, the pages are entered into it like one

Web Camera

- a digital camera that is connected to a computer - it can send live pictures from it once it is connected to a network such as the Internet - there are various types of these; some are plugged into computers through USB ports, but others are wireless (Wi-Fi) - additional features may include a microphone, ability to pan and tilt, built in sensors that can detect movement and start recording, and lighting to let you know that the camera is in use

Input Devices

- a hardware device used to submit Information, Instructions and data into a computer - it allows users to communicate with the computer - in order for a computer to begin the processing of ones data, the user will need some form of _______ methology to get the data to process over to the machine - this device of chose will be based upon the form of data you are expect to receive such as audio, video, text and graphical just to name a few

Pointing Devices

- computer mouse is a _______ device (hand control) that detects motion relative to a surface - this motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface - the computer Mouse is a _____ and input device - this is used to control the movement of the pointer/curser which is located on the screen -- The standard mouse will be manufactured with two or three buttons. The bottoms are located on the Right, left and Middle. Each Buttons are used to perform different functions.

Optical Mouse

- contains zero moving parts such as the ball located inside of the Mechanical Mouse - it uses light and a small optical sensor to detect the motion of the - this mouse may use a light sensor or laser technology

Advantage of Sheet-Fed

- it is smaller in size - it is more portable - it takes less space

Track Pad

- it is used in laptop computers to control the motion of pointer on screen - it is stationary - has a flat surface of 1.5-2 square inches - the user can navigate the computer using their fingers - most laptops have this

Track Ball

- it is used on mobile devices such as the old blackberry's, Notebook computers and as a stand-alone component to control motion of the pointer on screen - it is a pointing device like upside down mouse and it has a ball on its upper side -- this ball is moved by fingers or thumb and the pointer moves accordingly on screen - these have a huge advantage over a mouse wherein the body of the _______ remains stationary on your desk, the user do not need much room to navigate it

Disadvantage of Sheet-Fed

- it requires separate pages to scan, it can scan a book because of its layout - it can scan normal papers with normal thickness only one at a time

Digital Camera

- one of the latest and most used input devices - it stores the pictures and video it takes in electronic format instead of film - the process of how it stores data is considered digital - newer versions allow the user to take still snapshots and record videos - filters are trendy software tools that allow one to modify the images recorded

Display Measure

- screen size of all display devices is measured diagonally across the screen, in inches - not all of the screen area may be usable for image display, so the viewable area is also specified - the resolution of the monitor is the maximum number of pixels it can display horizontally and vertically (such as 800 × 600, 1024 × 768, or 1600 × 1200). Most monitors can display several resolutions less than its maximum setting.

OMR - Optical Mark Recognition

- senses the presence or absence of marks such as pencil marks and drawings - this is very useful to calculate or store multiple choice tests