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Assuming integral endpoints for the line segment if not then make them integral starting at the leftmost edge of the line: There are two distinct methods for changing a picture’s data rate:. By using this site, you agree to the Terms of Use and Privacy Policy.

For conversion of vector images to raster images, see Rasterisation. Digital conversion method needs the analog video signal to be converted to sdan data at the first step.

Tekstverwerkihg device which performs this conversion is called a scan converter. This algorithm requires no rounding, no floating point numbers, and no multiplications. Display technology Television terminology Video Video signal.

Scan conversion

In a language such as OpenGL polygons are very restricted to improve speed: Please help to improve this article by introducing more precise citations. The application of scan conversion is wide and covers video projectors, cinema equipment, TV and video capture cards, standard and HDTV televisionsLCD monitors, radar displays and many different aspects of picture processing.


Articles lacking in-text citations from August All articles lacking in-text citations Articles needing additional references from August All articles needing additional references Articles with multiple maintenance issues. The process of representing continuous graphics objects as a collection of discrete pixels is called scan conversion.

Retrieved August 19, Please help improve it or discuss these issues on the talk page. This allows a logical separation of the world from the view of that world. This conversion tekstvererking done using large numbers of delay cells and is appropriate for analog video.

The basic improvement of this algorithm over the purely braindead one is that instead of calculating Y for each X from the equation of a line one multiplication and one additionwe will calculate it from the previous Y by just adding a fixed constant one addition only. In a language such as OpenGL a programmer can generate a 2D line segment in world-space with code like the following: A scan converter can be made in its basic structure using some high speed integrated circuits as a circuit board however there are some integrated circuits ocnversie perform this function plus other picture processing functions like scissoring, change of aspect ratio and … an easy to use example was SDA How are line segments and polygons in world-space converted into illuminated pixels on the screen?

Then that algorithm is repeatedly refined, making it more complicated to understand, but much faster for the computer to implement.

This scene is then rendered into the frame buffer. We like to think about a scene as mathematical primitives in a world-space. Learn how and when to remove these template messages.


This is the topic we will discuss now. Most of the algorithms in Computer Graphics tekstverwerkinb follow the same pattern below. This article has multiple issues. Unsourced material may be challenged and removed.

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From Wikipedia, the free encyclopedia. First these coordinates in world-space must be converted to coordinates in the viewport ie pixel coordinates in the frame buffer. Calculate which pixels will be highlighted using the midpoint algorithm to draw a line from 5,8 to 9, Retrieved from ” https: 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 world to a 2D frame buffer which we will study a couple weeks later.

So we need more complex algorithms which use simpler operations to decrease the speed. It may also be performed using a specialized scan converter vacuum tube. The full algorithm is given in C in the white book as figure 3.

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.