Define refresh rate and refresh buffer, Computer Graphics

Refresh Rate: refreshing on raster - scan displays is carried out at the rate of 60 to 80 frames per second, although some system are designed for higher refresh rates. Sometimes, refresh rates are described in units of cycles per second, or Hertz (Hz), where a cycle corresponds to one frame. Using these units, we would describe a refresh rate of 60 frames per second as simply 60 Hz.

 Refresh buffer: in a raster-scan system, the electron beam is swept across the screen, one row at a time from top to bottom. As the electron beam moves across each row, the beam intensity is turned on and off to create a pattern of illuminated spots. Picture definition is stored in a memory area called the refresh buffer or frame buffer. This memory area holds the set of intensity values for all the screen points. Stored intensity values are then retrieved from the refresh buffer and ''pointed'' on the screen on row at a time. Raster - scan systems interactive raster graphics system typically employ several processing units. In addition to the central processing unit, or CPU, a special - purpose processor called the video - controller or display controller, is used to control the operation of the display devise. Organization of a simple raster scan system shown in figure below. Here the frame buffer can be anywhere in the system memory and the video controller accesses the frame buffer to refresh one screen. In addition to the video controller, more sophisticated raster systems employ other processors as coprocessor and accelerators to implement various graphics operations.  

 

Posted Date: 7/1/2012 6:27:04 AM | Location : United States







Related Discussions:- Define refresh rate and refresh buffer, Assignment Help, Ask Question on Define refresh rate and refresh buffer, Get Answer, Expert's Help, Define refresh rate and refresh buffer Discussions

Write discussion on Define refresh rate and refresh buffer
Your posts are moderated
Related Questions
Multimedia Tool Features General to nearly all multimedia tool platforms are various features for encapsulating the content, presenting the data, acquiring user input and cont

Write a C-code which generates a font interactively.This means after every n mouse clicks, a Bezier curve is generated and then the terminal point of the last drawn Bezier curve is

What is surface patch?  A single surface element can be explained as the surface traced out as two parameters (u, v) take all possible values between 0 and 1 in a two-parameter

Hypertext/media and Human Memory Humans associate pieces of information along with other information and make complicated knowledge structures. Thus, this is also said as the h

Graphics Hardware - Computer aided Design Despite with which advance graphic software you are working along with, if your output device is not well or hardware handling which

Constant intensity shading OR Flat shading  In this technique particular intensity is calculated for each polygon surface that is all points that lie upon the surface of the


Plasma Panel - Raster Graphics and Clipping This is an inherent memory device. Images can be written into the surface point by point and they keep stable, without flicked for

Digital audio comprises audio signals stored in a digital format. Particularly, the term encompasses the subsequent: 1)   Audio conversion: 1.   Analogue to digital conversi

QUESTION (a) Suppose that you have been assigned to re-engineer the existing systems for a company. Do you think that design patterns can be applied to these existing systems?