Raster scan and random scan

Raster scan and random scan

• 1.
  RASTER SCAN ANDRANDOM SCAN
• 2.
  WHAT IS PIXEL Apixel is the basic logical unit in digital graphics. Pixels are combined to form a complete image, video, text or any visible thing on a computer display. The pixel resolution also determines the quality of display; more pixels per inch of monitor screen yields better image results.
• 3.
  ASPECT RATIO The aspectratio refers to the proportions of the height and width of an image. It is represented as W:H (W is the width and H is the height). Usually Aspect Ratio are 4:3 , 8:6, 16:9
• 4.
  FRAME BUFFER A framebuffer is a portion of RAM containing a bitmap that drives a video display. It is a memory buffer containing a complete frame of data.
• 5.
  PIXEL IN WINDOWS
• 6.
  Raster Images Raster Imagesare called as Bitmap Images. Bitmap Images uses a grid of individual pixels where each pixel represents different colors.
• 7.
  RANDOM SCAN It usesmathematical equations for connecting lines to describe an image.
• 8.
  DIFFERENCE BETWEEN RASTERAND RANDOM RASTER SCAN RANDOM SCAN It has poor or less Resolution because picture definition is stored as a intensity value It has High Resolution because it stores picture definition as a set of line commands. It is less expensive than Random Scan System It is Costlier than Raster Scan System. It uses Pixels along scan lines for drawing an image. It uses various mathematical function to draw. Zig – Zag line is produced because plotted value are discrete. Smooth line is produced because directly the line path is followed by electron beam It Stores picture definition in Refresh Buffer also called Frame Buffer. It Stores picture definition as a set of line commandscalled Refresh Display File. Refresh rate is 60 to 80 frame per second. Refresh rate is 30 to 60frame per second.