Graphics inputdevices

PRESENTATION ON GRAPHICAL INPUT DEVICES "Artificial life, a major subfield of complexity studies, is 'fact-free science', but it excels at generating computer graphics.“ John Maynard Smith , Evolutionary theorist

WHAT IS AN INPUT DEVICE? An input device is any peripheral used to provide data and control signals to an information processing system .

LIST OF SOME INPUT DEVICES: Mouse Keyboard Trackball Space ball Joystick Digitizer Dials Button boxes

APPLICATION BASED INPUT DEVICES: Data gloves Touch panels Image scanners Voice systems

KEYBOARD IT is a device primarily used to enter TEXT STRINGS. APLLICATIONS: Used to enter Text Strings Short cuts to many Functions In Graphics : Used to provide screen coordinates Menu selection Gaming controls And FOR entering many graphics function

MOUSE Hand-held BOX used to position the screen cursor Wheels or Rollers(now-a-days Laser lights) on the bottom are used to record the position of the screen Generally there are two or three buttons, used for operations like recording of the cursor positions or invoking of a function In order to increase the number of INPUT parameters, additional devices can be included The Z-MOUSE is an example of this

Z-MOUSE KEY FEATURES: Has three buttons, a thumbwheel on the side, a trackball on the top and a standard mouse ball underneath This provides SIX degrees of freedom to select the positions, rotations ETC Allows 3D viewing Applications: Animation Auto CAD And many more areas

SOME FACTS ABOUT THE MOUSE(COMPUTING) Invented By Douglas C Engelbart An AMERICAN inventor The first prototype computer mouse was made to use with a graphical user interface, in 1964 It was patented on 17 November 1970, under the name "X-Y Position Indicator For A Display System“

TRACKBALL It is a 2D positioning device It consists a ball held by a socket containing sensors to detect the rotation of ball about TWO axis User rolls the ball to move the cursor They are often mounted on devices such as keyboards, Z-mouse ETC

SPACEBALLS It provides SIX degrees of freedom It is a fix device Movement detection is done using strain gauges Cursor can move in any direction It is more efficient then trackball

APPLICATIONS: Used in CAD workstations In animation Sometimes on special Workstations such as the radar consoles in air-traffic control room In Gaming consoles People with a mobility impairment use trackballs as an assistive technology input device

JOYSTICK Consists of a stick pivoted on a base Used to steer the screen cursor It also has one or two PUSH buttons as input switches to perform certain actions Most joystick are 2D, but 3D do exist Distance moved from the CENTER position corresponds to the screen cursor movement in that direction

APPLICATIONS: In Gaming consoles In 3D animation Used to drive machines like cranes, mining trucks, hydraulics ETC Used as assistive technology pointing device such as in Electronic wheelchairs

DATA GLOVE Used to grasp a “virtual” object Uses sensors to detect the Hand and finger motion Electromagnetic coupling between signals provides information about the position and orientation of the HAND

APPLICATIONS: In 3D animation movies Visual effects Gestures can be categorized into useful information, such as to recognize Sign Language or other symbolic functions 3D Virtual environment Games

DIGITIZERS Common device for drawing, painting, or interactively selecting coordinate positions on an object Typically, it is used to scan an Object and to input discrete coordinate positions ONE TYPE of Digitizer is the Graphics Tablet

GRAPHICS TABLET A graphics tablet is a computer input device that allows one to hand-draw images and graphics, similar to the way one draws images with a pencil and paper. These tablets may also be used to capture data or handwritten signatures The common drawing TOOLS used to draw are HAND CURSOR and STYLUS A STYLUS is a pencil-shaped pointing device

GRAPHICS TABLET This Digitizing system uses electromagnetic resonance to detect the 3D positions of the STYLUS This allows one to produce different shades of brush strokes with different pressure on its surface Acoustic Tablets use sound waves to detect the position of the STYLUS

GRAPHICS TABLET 3D Digitizers use sonic or electromagnetic transmissions to record positions It uses the same mechanism used in the Data Gloves

APPLICATIONS: Used in generating Computer generated graphic images Used in creating characters for Animation In Technical drawings and CAD Used for Handwriting recognition

IMAGE SCANNERS In computing, a scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image When the scanning is performed, the gradation of gray scale or colors are recorded and stored in an array Once scanned, any kind of transformations can be applied to the object image

LIGHT PENS A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT TV set or monitor Allows the users to point to displayed objects and to draw objects on screen The position points are highly accurate and sensitive It generates electrical pulse which records the position of the electron beam Not very much popular

LIGHT PENS Disadvantages: When pointed on the screen, part of the image becomes DARK by hand and the pen As they cannot detect black areas, special implementation are needed Sometimes give false readings due to the background lighting in a room

SOME FACTS: Today, the Computer Graphics INDUSTRY is one of the brightest and the most Upcoming industry. Right from Television Ads to Animation, everywhere computer generated images or graphics are always used. The latest sensation in this, is the movie “AVATAR”, where almost every kind of latest graphic tools were used.

“ ALL OUR DREAMS CAN COME TRUE, IF WE HAVE THE COURAGE TO PURSUE THEM.” ---WALT DISNEY Created by: PRIYANK VYAS PULKIT KESHAR CSE-A CSE-A Mail ID: Mail ID: priyankvyas.007[at]gmail[dot]com pulkit.upsc[at]gmail[dot]com

Graphics inputdevices

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Graphics inputdevices