Define refresh rate and refresh buffer, Computer Graphics

Assignment Help:

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.  

 


Related Discussions:- Define refresh rate and refresh buffer

Devi, Explain the 3d transformations

Explain the 3d transformations

Img- mac-msp file formats, IMG/MAC/MSP File Formats IMG files were orig...

IMG/MAC/MSP File Formats IMG files were originally implemented to work along with GEM paint program and can handle monochrome and grey level pictures only. MAC files are uti

Intensity of colours - raster graphics and clipping, Similarly we can contr...

Similarly we can control the intensity of colours We contain more bit planes for all colour say three bit planes for R, 3 for G and 3 for B here all bit plane of size mxn, hen

Rotation about an arbitrary axis, Rotation about an arbitrary axis Rota...

Rotation about an arbitrary axis Rotation about an arbitrary axis is a composition of several rotations and translation operations. What you need to do is the following:  a)

Line drawing algorithm, Adavantage and disadvantages of DDA and Bresenhams ...

Adavantage and disadvantages of DDA and Bresenhams line drawing algorithm

Create an animated application, The purpose of this assignment is for you t...

The purpose of this assignment is for you to create an animation like you would see on an electronic greeting card. Have fun and be creative.  Here are the requirements: you

Find out projection matrix for oblique projection, Find Out Projection Matr...

Find Out Projection Matrix for Oblique Projection To find out projection matrix for oblique projection, we want to find out the direction vector d. Because vector PP' and vect

#title., WHAT IS PAINTERS ALGORITHM?

WHAT IS PAINTERS ALGORITHM?

Limitations of cohen sutherland line clipping algorithm, Limitations of Coh...

Limitations of Cohen Sutherland line clipping Algorithm The algorithm is merely applicable to rectangular windows and not to the other convex shaped window. Consequently, a

Explain parallel and perspective projection, Distinguish between parallel a...

Distinguish between parallel and perspective projection Parallel Projection Perspective projection Coordinate position are transformed

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd