In computer graphics, an image is displayed by illuminating (drawing) the pixels at appropriate locations on the picture information in the refresh buffer of the display device which is read by video controller circuitry of the computer and accordingly. Voltages applied to the control grid and deflection plates are varied to get ‘on’ the desired pixel. The process of plotting the object on the screen is called scan conversion.
The Random and Raster display devices a sense can taken as compared of various basic geometric structure called primitives, straight line, circle ellipse.
The process f representing continues graphics object as a collection of discrete pixels is called scan conversion.
The random or raster display devices a scene can be taken as compared various basic geometric structure called output primitives. They are point, line, circle, ellipse and other surface.
SCAN CONVERTING A POINT
A screen is compared of a 2-D array of pixel positions with the origin at upper left corner of the screen. Every co-ordinate position is referred to as a (x, y) coordinate pair with X-value corresponding to the column positions, where as the Y-value corresponding to the Y- values. Corresponding to the row position and there initial zero values at the origin.
POINT:- A point is called scan converting point is the fundamental elements of picture representation. It is nothing, but the position in a plane, x, y, or x, y, z would represent a point either two or three dimensional space. Two points represent a line or edge and a collection of three or more points a polygon.
2. LINE SEGMENTS: – When we say the line, it extends forever both forward and backward. In graphics, we need to display only piece of lines. When we consider the piece of line, i.e. only those points which lay between two end points then this is called a line segment.
3.VECTOR:- A vector has a single direction and a length. A vector may be indicated by [Dx, Dy] where Dx denotes the distance on x-axis direction and Dy denotes the distance on Y-axis direction. When we consider a line segment, it has a fixed position in space but vector does not have a fixed position in space. The vector does not tell us the starting to move and in which direction.
SCAN CONVERTING A STRAIGHT LINE .
A straight line can be drawn by plotting discrete point’s b\w the two end points. ...read more
Explain display tecnology?
DISPLAY TECHNOLOGY Two types of display technology are commonly used monitors. The CRT which has been ...read more
Some basic Terms of computer graphics
1. PIXEL:-A pixel may be defined as the smallest size object or color spot ...read more
HOW THE INTERACTIVE GRAPHICS DISPLAY WORK?
The modern graphics display is very simple in construction .it consist of three components. 1. Frame ...read more
What is computer graphics.
COMPUTER GRAPHICS The computer is an information processions machine. It is a tool storing, manipulating ...read more