Quiz 2

1. There are several methods of getting data into your computer. Some include using a mouse of which there are several different types such as mechanical mouse, optical mouse and cordless mouse. You also have a touchpad and joysticks. Below you will find some other non conventional pen input devices.

Light Pen - Light pen is actually one more pointing input gadget. This will pick up on existence of light. It's a hand held pen fashioned gadget having a photocell installed in it's front-end. Once the front-end on the pen is actually touched on the display screen, the actual photocell registers a position associated with display. This kind of instrument also offers a button. An individual points to the actual object that will end up being chosen on the display screen using the light pen after which clicks the button in the pen. Light pen gadgets are utilized by technical engineers, visual creative designers and so on. These types of gadgets call for unique displays. Light pen can be used on PDA's and also other kinds of portable computers.
The electrical light pen input instrument is usually combined with creating computer software. Designed screen data files are usually joined using a light pen simply by directing it to display positions. A new place shows up on the screen in the area exactly where pen is placed which is sensed through the photocell. The pc software operated the feedback transmission of the instrument.
Digitizer - A Digitizer is also called a graphic tablet and uses a pen input device. It's a flat, rectangle-shaped digital plastic material pad. Every position to the digitizer points to matching video display. It's primarily useful for producing road maps and also engineering blueprints. The actual input gadgets stylus pen and also cursor can be used to trace sketches and also drawings to the digitizer.
Whenever you sketch upon the digitizer with the aid of the stylus pen or cursor, this converts the actual actions associated with stylus or cursor straight into electronic signals which are afterwards routed to the laptop or computer. Therefore a digitizer makes it simple to key in free-hand sketching in to a laptop or computer.
Stylus and Cursor - Stylus pen is actually like a ballpoint pen. It's utilized to compose textual content or make lines (or generate drawings and also pictures) on the exclusively developed graphics display or digitizer. Pen input devices found in several sophisticated graphic devices is called Digital Pen. Generally electronic digital pen supplies much more performance compared to stylus pen.
Stylus pen can be used in graphic programs for instance Computer Aided Design (CAD) and also engineering blueprints and so forth. It's got the convenience of removing textual content as well as lines.
Several portable personal computers make use of touch screens which permit someone to enter any data and even to enable selections in the monitor utilizing a stylus pen or a digital pen. PDA's utilize pen input devices along with tablet Computers quite often use a digital pen. These laptop or computer operates one-of-a-kind platforms also known as optical character recognition. Such a program converts written characters along with symbols to a mode which the computer systems may use and also process all of them.
The actual cursor is surely an input product. It's also used to trace sketches and also drawings with a graphic tablet or perhaps digitizer. This appears like some sort of computer mouse, with the exception of it's got a window using crosshairs, therefore the end user is able to see through to the actual digitizer. Cursor is generally known as Puck.

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2. A game controller is a device used with games or entertainment systems used to control a playable character or object, or otherwise provide input in a computer game. A controller is typically connected to a game console or computer by means of a wire, cord or nowadays, by means of wireless connection. Controllers which have been classified as game controllers are keyboards, mice, game pads, joysticks, etc. Special purpose devices, such as steering wheels for driving games and light guns for shooting games, are also game controllers. Devices such as mice and keyboards can be emulated with a game pad through the use of programs such as 'JoyToKey'. The main function of a game controller is to govern the movement/actions of a playable body/object or otherwise influence the events in a video or computer game. The type of controller used in a game depends on the genre of the game being played (i.e. Steering Wheel controllers for driving games, yoke like for flying, etc).

3. Image resolution describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. Higher resolution means more image detail.

Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch), to the overall size of a picture (lines per picture height, also known simply as lines, or TV lines), or to angular subtenant. Line pairs are often used instead of lines; a line pair comprises a dark line and an adjacent light line. A Line (or TV line, TVL) is either a dark line or a light line. A resolution of 10 lines per millimeter means 5 dark lines alternating with 5 light lines, or 5 line pairs per millimeter (5 LP/mm). Photographic lens and film resolution are most often quoted in line pairs per millimeter.

4. Speech recognition (also known as automatic speech recognition or computer speech recognition) converts spoken words to text. The term "voice recognition" is sometimes used to refer to recognition systems that must be trained to a particular speaker—as is the case for most desktop recognition software. Recognizing the speaker can simplify the task of translating speech.

A webcam is a video camera which feeds its images in real time to a computer or computer network, often via USB, ethernet or Wi-Fi.A videoconference or video conference (also known as a videoteleconference) is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously. It has also been called 'visual collaboration' and is a type of groupware

5. Discuss how various scanners and reading devices work: optical scanners,
optical readers, bar code readers, RFID readers, magnetic stripe card

An optical reader is a device found within most computer scanners that captures visual information and translates the image into digital information the computer is capable of understanding and displaying.

An optical scanner is any scanning technology that converts a physical image, text, or object into a digitized form that can be stored as a 2D image file on a computer. 3D scanners also exist, but they are not widespread and are sometimes based on different technologies. Optical scanners have been around for decades and their price has dropped accordingly. You can buy low-level used optical scanners on eBay for as little as 20 US dollars (USD) and a new scanner on newegg.com for around 50 USD. Better optical scanners sell for hundreds of dollars.

A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all barcode readers contain decoder circuitry analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port.

An RFID reader is a device that is used to interrogate an RFID tag. The reader has an antenna that emits radio waves; the tag responds by sending back its data. A magnetic stripe card is a type of card capable of storing data by modifying the magnetism of tiny iron-based magnetic particles on a band of magnetic material on the card. The magnetic stripe, sometimes called swipe card or magstripe, is read by physical contact and swiping past a magnetic reading head

6. Summarize the various biometric devices: fingerprint reader, face
recognition system, hand geometry system, voice verification system,
signature verification system, and iris recognition system

Fingerprint recognition or fingerprint authentication refers to the automated method of verifying a match between two human fingerprints. Fingerprints are one of many forms of biometrics used to identify individuals and verify their identity. This article touches on two major classes of algorithms (minutia and pattern) and four sensor designs (optical, ultrasonic, passive capacitance, and active capacitance).

A facial recognition system is a computer application for automatically identifying or verifying a person from a digital image or a video frame from a video source. One of the ways to do this is by comparing selected facial features from the image and a facial database.

It is typically used in security systems and can be compared to other biometrics such as fingerprint or eye iris recognition systems

 Authenticates person’s identity by verifying personal characteristic 

Signature Verification System (SVS) provides an organisation with the ability to deliver a signature or customer image to an operator, enabling identification of the customer

§Fingerprint scanner captures curves and indentations of fingerprint

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recognition is the computing task of validating a user's claimed identity using characteristics extracted from their voices recognition is the computing task of validating a user's claimed identity using characteristics extracted from their voices.

Iris recognition is a method of biometric authentication that uses pattern-recognition techniques based on high-resolution images of the irides of an individual's eyes.

Hand geometry system measures shape and size of person’s hand