Quiz 2

Questions:

1.      Describe various types of pen input, and identify other types of input for smart phones.

·         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.

·         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.

·         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.

o   A “flexible iPhone” prototype does everything a smartphone does, such as store books, play music or make phone calls.

o   Blind Type develops an interface for typing on virtual QWERTY keyboards, which claims to allow for super sloppy typing, or typing without looking at the screen.

2.      The purpose of various game controllers: gamepads, joysticks and wheels, light guns, dance pads,and motion-sensing game controllers.

·         Gamepad a type of game controller held in the hand, where the digits are used to provide input. Gamepads generally feature a set of action buttons handled with the right thumb and a direction controller handled with the left. The direction controller has traditionally been a four-way digital cross but most modern controllers additionally feature an analog stick.

·    Joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling. Joysticks are often used to control video games, and usually have one or more push-buttons whose state can also be read by the computer.The joystick has been the principal flight control in the cockpit of many aircraft, particularly military fast jets, either as a center stick or side-stick.

·         Joysticks and Wheels are going through a rough patch. There are a number of reasons for this. Games that require this kind of device are not what the fashion victims want at the moment. They want First Person Shooter (FPS), action and adventure, strategy and RPG (role-playing) games - the sort of games you play with a mouse and keyboard.

·         Light gun is a pointing device for computers and a control device for arcade and video games. The light gun and its ancestor, the light pen, are now rarely used as pointing devices due largely to the popularity of the mouse and changes in monitor display technology—conventional light guns only work with CRT monitors.

·         Dance pad or dance mat, dance platform, or jitter deck is a flat electronic game controller used for input in dance games. Most dance pads are divided into a 3×3 matrix of square panels for the player to stand on, with some or all of the panels corresponding to directions or actions within the game. Some dance pads also have extra buttons outside of the main stepping area, such as "Start" and "Select". Pairs of dance pads are often joined side-by-side for certain gameplay modes.

·         The Motion-Controller Technology takes Motion-sensing to the next level. It provides 5 Degrees of Freedom and all the sub system integration and signal processing required to guarantee “perfect motion control”, making it ideal for remote controls, game controllers, mice and other digital media input devices. The key component, the MotionSense Control Chip, allows customers to dynamically adjust key parameters at a system level.

3.      Explain how resolution affects the quality of a picture captured on a digital camera.

·         Resolution is the sharpness and clarity of image. The higher the resolution, the better the image quality. Thus, a picture captured on a digital camera with a low resolution has a poor quality.

4.  Describe the uses of voice recognition, web cams, and video conferencing.

·    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.

·  Web cams is a video camera which feeds its images in real time to a computer or computer network, often via USB, Ethernet or Wi-Fi.

·  Video conferencing, two or more geographically separated people who use network or Internet to transmit audio and video data.

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

·         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.

·         Optical reader is a device that uses light source to read characters, marks, and codes and then converts them into digital data.

·         Bar code reader uses laser beams to read bar codes.

·         RFID reader reads information on the tag via radio waves.

·         Magnetic stripe card reader reads the magnetic stripe on the back of a credit card.

·         MICR readers can read text printed with magnetized ink.

·           Data collection devices obtain data directly at location where transaction or event takes place. They transmit data over network or Internet.

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 scanner captures curves and indentations of fingerprint.

·         Face 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.

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

·         Voice recognition system compares live speech with stored voice pattern.

·         Signature verification system recognizes shape of signature.

·         Iris recognition system reads patterns in blood vessels in back of eye.