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Questions and Answers
What are the geometric objects that need to be represented in a 2-D grid?
What are the geometric objects that need to be represented in a 2-D grid?
The geometric objects that need to be represented in a 2-D grid are points, lines, curves, and polygons.
What is a raster in the context of display systems?
What is a raster in the context of display systems?
In display systems, a raster is a series of adjacent parallel lines that together form an image on a display screen. It is a rectangular grid or an array of pixel positions.
Explain the difference between random scan and raster scan in display systems.
Explain the difference between random scan and raster scan in display systems.
Random scan and raster scan are two different methods used in display systems. In random scan, the electron beam directly writes the picture on the screen, while in raster scan, the picture is created by scanning the electron beam across the screen in a series of horizontal lines.
Define the term 'scan conversion' in the context of drawing methods.
Define the term 'scan conversion' in the context of drawing methods.
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What are pixels in the context of display systems?
What are pixels in the context of display systems?
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Which one of the following best describes computer graphics?
Which one of the following best describes computer graphics?
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What is the main purpose of modeling in computer graphics?
What is the main purpose of modeling in computer graphics?
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Which of the following is NOT an example of computer graphics?
Which of the following is NOT an example of computer graphics?
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What is the term used to describe the collection of discrete picture elements in computer graphics?
What is the term used to describe the collection of discrete picture elements in computer graphics?
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What are the different areas of computer graphics?
What are the different areas of computer graphics?
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Study Notes
Geometric Objects in 2-D Grid
- Geometric objects include points, lines, polygons, and text.
- These objects are represented using coordinate pairs within a grid system.
Raster in Display Systems
- A raster refers to a grid of pixels that comprise an image displayed on a screen.
- Each pixel in a raster corresponds to a specific color or intensity, contributing to the overall visual output.
Random Scan vs. Raster Scan
- Random scan displays generate images by directing the electron beam to specific screen locations, often resulting in smoother lines for vector graphics.
- Raster scan displays work by systematically scanning the screen line by line to refresh the image, suitable for bitmap graphics.
Scan Conversion
- Scan conversion is the process of converting geometric descriptions of shapes into raster format for display.
- This involves determining which pixels on the raster grid should be illuminated to represent the shape accurately.
Pixels in Display Systems
- Pixels (picture elements) are the smallest units of visual information in a raster image, forming the overall display.
- Each pixel's color and intensity are defined, contributing to the details of the image.
Definition of Computer Graphics
- Computer graphics is defined as the creation, manipulation, and representation of visual images through computational processes.
- It combines artistic and technical elements to produce images for various applications.
Purpose of Modeling in Computer Graphics
- The main purpose of modeling is to create digital representations of objects in 3D space for rendering and visualization.
- This involves defining the geometry and appearance of objects to be displayed.
Examples of Computer Graphics
- Examples include 3D modeling, photo editing, animation, and visual effects used in films and games.
- Non-examples typically involve textual data or plain numerical outputs that don’t include visual components.
Discrete Picture Elements
- The term for the collection of discrete picture elements is known as a pixel or raster image.
- These elements collectively form the images or graphics viewed on screens.
Areas of Computer Graphics
- Different areas include 2D/3D graphics, animation, visualization, rendering, and interactive graphics.
- These areas span applications from entertainment and design to simulations and scientific visualization.
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Description
Test your knowledge of scan conversion algorithms in display systems. Learn about representing geometric objects in a 2-D grid and how to visualize images as points, lines, curves, and polygons.
