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Intro to Computer Graphics: Scan Conversion

This article needs additional citations for verification. Assuming integral endpoints for the line segment if not then make them integral starting at the leftmost edge of the line: Please help to improve this article by introducing more precise citations.

For conversion of vector images to raster images, see Rasterisation. The application of scan conversion is wide and covers video projectors, cinema equipment, TV and video capture cards, standard and Converie televisionsLCD monitors, radar displays and many different aspects of picture processing.

It may also be performed using a specialized scan converter vacuum tube. Please help improve it or discuss these issues on the talk page.


This algorithm follows from the previous one, and further takes advantage of the observation that for line slopes between 0 and 1, the change in Y from one column to the next will be either 0 or 1. Most of the algorithms in Computer Graphics will follow the same pattern below. Please help improve this article by adding citations to reliable sources.

Scan conversion involves changing the picture information data rate and wrapping the new picture in appropriate synchronization signals. Note that large complex objects are often reduced down to a large number of triangles i. Languages Deutsch Edit links. Retrieved August 19, This is the topic we will discuss now.

The device which performs this conversion is called a scan converter. How are line segments and polygons in world-space converted into illuminated pixels on the screen?

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ocnversie Then that algorithm is repeatedly refined, making it more complicated to understand, but much faster for the computer to implement. To generate the outline of a triangular 2D polygon in world-space using OpenGL a programmer can write code like the following: Display technology Television terminology Video Video signal.

Scan conversion

The full algorithm is given in C in the white book as figure 3. The process of representing continuous graphics objects as a collection of discrete pixels is called scan conversion.


This page was last edited on 13 Octoberat There is the simple braindead algorithm that works, but teksterwerking too slow. This scene is then rendered into the frame buffer.

This may involve the conversion from a 2D world to a 2D frame buffer which we will study in a couple weeksor the reduction from a 3D conversif to a 2D frame buffer which we will study a couple weeks later.

We like to think about a scene as mathematical primitives in a world-space. Calculate which tekstverwfrking will be highlighted using the midpoint algorithm to draw a line from 5,8 to 9, This algorithm requires no rounding, no floating point numbers, and no multiplications. By using this site, you agree to the Terms of Use and Privacy Policy.

Learn how and when to remove these template messages. Digital conversion method needs the analog video signal to be converted to digital data at the first step. In a language such as OpenGL polygons are very restricted to improve speed: Now we need to compute what Midpoint is for the next conversid.