YKTALK

Computer Graphics generated pictures can be displayed on diversified display medium called the video display devices . The primary output device in a graphics system is a video monitor. Types of Display Technologies Cathode Ray Tube(CRT) Direct View Storage Tube(DVST) Flat Panel Display Cathode Ray Tube(CRT) This is a vacuum glass tube capable of converting computers electrical signals into variable images at high speed. CRT is the technology used in traditional computer monitors and televisions. In CRT, when cathode is heated it emits electrons which after through the focusing and deflection plates gets strike on the phosphor coated screen and as the electron strike the screen, they give their energy to phosphor, which causes a few photons to be generated and results in our seeing a spot on the CRT's face. The CRT is also called the Continual Refresh Tube as one has to draw pictures repeatedly by quickly directing the electron beam over the same point as light emitted by phosphor ...

  Application Development of Hardware and software for Computer Graphics There are following three types of technology developed for computer graphics: i ) Input Technology: Advances in computer graphics have transformed how we use computers. Computer Graphics has given us the "mouse" input device, "What -You -See -Is- What- You- Get" document preparation systems. ii)  Output Technology: Output is the term denoting either an edit or changes which edit a system and which activate/modify a process. It is an abstract concept, used in the modelling, systems design and systems exploitation. I/O is the means by which a computer exchanges information with the outside world. Devices that provide input or output to the computer are called peripherals. iii) Software Technology: The aim of the work is to show how  the most advanced technology together with spatial analysis can be usefully employed to investigate historical and archaeological phenomena.

Advantages of Interactive Computer Graphics: Graphics provides one of the most natural means of communicating with a computer, since our highly developed 2D and 3 D pattern recognition abilities allow us to perceive and process pictorial data rapidly and efficiently. Creating and reproducing pictures, however, presented technical problems stood in the way of their widespread use. There is also an Chinese proverb "A picture is worth ten thousand words". Interactive computer graphics is the most important means of producing pictures since the invention of photography and television; it has the added advantage that, with the computer, we can make pictures not only of concrete," real- world" objects but also of abstract, such as mathematical surfaces in 4D and of data that have no inherent geometry, such as survey result. Representatives uses of computer graphics: Computer Graphics is used today in many different areas of industry, business, government, education, enter...

 There are two types of Computer Graphics: i) Non-Interactive/ Passive/Offline Computer Graphics:- The most common examples of passive copmuter graphics is static website where user has no control over the contents on the monitor. In this, development takes place independently in offline mode. ii) Interactive/ Active/ Online Computer Graphics:- Displays are controlled by mouse, track balls, joystick etc. It involves a 2 -way communication between computer & user. This is turned as interactive computer graphics because the user can interact with the machine as per his requirements. Video games, dynamic websites are all making use of interactive graphics.

Following are the advantages of Computer Graphics:- i) Information becomes more communicative when it is represented graphically. ii) A huge table of numbers may be replaced by a simple graph or chart diagram. iii) Visual form of data may be more relevant to realize their characteristics. iv)Effective tool for representation. v) Computer graphics also provide facilities called update dynamics, with it is possible to change the shape, color or other properties of the objects being viewed.

 Following applications of Computer Graphics are given below:- Computer Aided Design(CAD) Cartography Entertainment Animation & Simulation Education & Training Plotting 2D-3D curve Art & Commerce Morphing Communication Image Processing Medical Application i)Computer Aided Design(CAD):- The major use of Computer Graphics is in design process, particularly       for engineering & architectural system, but almost all products are now computer designed. CAD methods are now routinely use in the designing process buildings, automobiles, air crafts and many other products. ii) Cartography:- Computer Graphics are used to produce accurate and schematic representations of graphical and other natural phenomena from measured data. Example:-Geographic maps, Weather maps, population density maps, contour maps etc. iii)Animation :- Animation is rapid display of a sequence of images of 2D or 3D network position in order to create an illusion of movement. It is ...

 Interactive Computer Graphics consist of three components such as:- i) Digital Memory Buffer(Frame Buffer) ii) T.V Monitor iii) Video (Display) Controller. i) Digital Memory Buffer :- This is the place where images or pictures are stored as an array (matrix of                                                         0 and 1, 0 represent darkness &1 represents images or pictures). Frame Buffer is the video RAM that is used to hold or map the images displayed on the screen. ii) T.V Monitor :-Monitor helps us to view the display and they make the use of CRT (Cathode Ray              Tube) iii) Display Controller :- It is an interface between the digital memory buffer and TV monitor. The main function of display controller is to pass the elements of framework to the monitor...