2ND QUIZ

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

Tablet PC is the pen input system. All Tablet PC computers have a digitizer beneath the screen that accepts pen input. This new input mechanism requires you to think about how to build applications specifically for Tablet PC. The Tablet PC platform application programming interface (API) helps you do this.

Collection, Data Management, and Recognition

The Tablet PC platform can be divided into three distinct areas:

• Ink collection (objects that are used to collect ink from the digitizer).
• Ink data management (objects that are used to manage the collected ink).
• Ink recognition (objects that are used to convert the collected ink into other types of data, such as text).

The following image shows, at a high level, how the Ink Collection API (Pen API), Ink Data Management API (Ink API), and Ink Recognition API (Recognition API) work together in the Tablet PC platform.

The Tablet PC platform API is available in a Managed Library and an Automation Library. The following topics describe the objects in the API and illustrate how applications use these objects.

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

    

 A lever that moves in all directions and controls the movement of a pointer or some other display symbol. A joystick is similar to a mouse, except that with a mouse the cursor stops moving as soon as you stop moving the mouse. With a joystick, the pointer continues moving in the direction the joystick is pointing. To stop the pointer, you must return the joystick to its upright position. Most joysticks include two buttons called triggers.

Joysticks are used mostly for computer games, but they are also used occasionally for CAD/CAM systems and other applications.

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

digital camera.

          It 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. Describe the uses of voice recognition, Web cams, and video conferencing

     Voice recognition is the process of taking the spoken word as an input to a computer program. This process is important to virtual reality because it provides a fairly natural and intuitive way of controlling the simulation while allowing the user's hands to remain free. This article will delve into the uses of voice recognition in the field of virtual reality, examine how voice recognition is accomplished, and list the academic disciplines that are central to the understanding and advancement of voice recognition technology.

      

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

Their most popular use is the establishment of video links, permitting computers to act as videophones or videoconference stations. This common use as a video camera for the World Wide Web gave the webcam its name. Other popular uses include security surveillance and computer vision.

Webcams are known for their low manufacturing cost and flexibility, making them the lowest cost form of videotelephony. They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated via spyware.

          

      A video-conference or video conference (also known as a video teleconference) 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.

Videoconferencing differs from videophone calls in that it's designed to serve a conference rather than individuals. It is an intermediate form of video-telephony, first deployed commercially by AT&T during the early 1970s using their Picture-phone technology.

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. 

In computing, an image scanner—often abbreviated to just scanner— is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Common examples found in offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.

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 example of optical readers are marksense systems for elections where voters mark their choice by filling a rectangle, circle or oval, or by completing an arrow. After the voting a tabulating device reads the votes using "dark mark logic", whereby the computer selects the darkest mark within a given set as the correct choice or vote.

Marksense is also used extensively in such areas as lotteries and multiple choice tests.

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

ØDevice that reads informations from fingerprint, face, hand structure, voice , signature and to iris of a user or owner.

• as text).