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Introduction and Overview of Graphics System
Semester
Subject
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Important Questions
Important Questions
Introduction and Overview of Graphics System
Asked in 2080Short Question5 Marks
1.
Explain architecture of random scan display systems with suitable diagram. [5]
Architecture of Random Scan Display System
Random Scan Display (also called Vector Display or Stroke-Writing Display) is a display system where the electron beam is directed only to the parts of the screen where an image is to be drawn, rather than scanning the entire screen.
Working Principle
In a random scan system, the electron beam moves directly from one point to another drawing only the lines/vectors that make up the picture. It does not scan the entire screen line by line like a raster system.
Architecture Diagram
Key Components
CPU (Processor): Executes the graphics application and generates drawing commands (line endpoints, coordinates).
System Memory: Stores the main application program and data.
Display List (Refresh Buffer): Stores a sequence of line-drawing commands (not pixel values). Contains instructions like "move to (x1, y1), draw line to (x2, y2)".
Display Controller: Reads instructions from the display list and converts them into deflection voltages for the CRT. It cycles through the display list 30–60 times per second to maintain the image.
CRT Monitor: The electron beam traces lines directly on the phosphor screen based on deflection signals.
Key Characteristics
- Produces smooth lines (no jagged edges)
- Refresh rate depends on the number of lines to be drawn
- Display list stores drawing commands, not pixel intensity values
- Suited for line-drawing applications like CAD
Conclusion
Random scan displays are efficient for applications involving line drawings since the beam only traces required lines, providing high-quality vector images but limited in displaying complex filled areas or realistic images.
Asked in 2079Short Question5 Marks
2.
Discuss the use of computer graphics in different areas. [5]
Asked in 2079Long Question10 Marks
3.
Draw the block diagram of vector and raster graphics display architecture and write the advantages and disadvantage of both display architecture. [10]
ModelShort Question5 Marks
4.
Differentiate between vector and raster scan systems. [5]
ModelShort Question5 Marks
5.
How much time is spent scanning across each row of pixels during screen refresh on a raster system with resolution 1024*768 and refresh rate of 60 frames per second? [5]