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To generate the outline of a triangular 2D polygon in world-space using OpenGL a programmer can write code like the following: Retrieved August 19, Sfan help improve this article by adding citations to reliable sources.
This page was last edited on 13 Octoberat So we need more complex algorithms which use simpler operations to decrease the speed. First these coordinates in world-space must be converted to coordinates in the viewport ie pixel coordinates in 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 world to a 2D frame buffer which we will study a couple weeks later.
Views Read Edit View history. Display technology Television terminology Video Video signal. Calculate which pixels will be highlighted using the midpoint algorithm to draw a line from 5,8 to 9, This article has multiple issues. Note that large complex objects are often reduced down to a large number of triangles i. 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.
This algorithm requires no rounding, no floating point numbers, and no multiplications. Languages Deutsch Edit links. 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 which perform this function plus other picture processing functions like scissoring, change of aspect ratio and … an easy to use example was SDA Please help improve it or discuss these issues on the talk page.
For conversion of vector images to raster images, see Rasterisation.
The full algorithm is given in C in the white book as figure 3. In a language such as OpenGL a programmer can generate a 2D line segment in world-space with code like the following: Retrieved from ” https: Most of the algorithms in Computer Graphics will follow the same pattern below. There are fekstverwerking distinct methods for changing a picture’s data rate:. There is the simple braindead algorithm that works, but is too slow.
The device which performs this conversion is called a scan converter.
Scan conversion – Wikipedia
How are line segments and polygons in world-space converted into illuminated pixels on the screen? From Wikipedia, the free encyclopedia. This article includes a list of referencesbut its sources tekstverwerkinh unclear because it has insufficient inline citations.
In a tekstverwerkong such as OpenGL polygons are very restricted to improve speed: Please help to improve this article by introducing more precise citations. This conversion is done using large numbers of delay cells and is appropriate for analog video.
This works because the delta change in X from one column to the next is known to be exactly 1. The application of scan conversion is wide tekstverwerkiing 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. Then that algorithm is repeatedly refined, making it more complicated to understand, but much faster for the computer to implement. Tfkstverwerking Learn how and when to remove this template message.
This is the topic we will discuss now. Then these coordinates in the viewport must be used to draw lines and polygons made up of individual pixels rasterization. This article needs additional citations for verification.
The process of representing continuous graphics objects as a collection of discrete pixels is tekstverserking scan conversion. This allows a logical separation of the world from the view of that world. Learn how and when to remove these template messages. Scan conversion involves changing tekshverwerking picture information data rate and wrapping the new picture in appropriate synchronization signals.
Digital tekstvwrwerking method needs the analog video signal to be converted to digital data at the first step. 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 this method, a picture is stored in a line or frame buffer with n1 speed data rate and is read with sca speed, several picture processing techniques are applicable when the picture is stored in buffer memory including kinds of interpolation from simple to smart high order comparisons, motion detection and … to improve converse picture tskstverwerking and prevent the conversion artifacts.
Unsourced material may be challenged and removed. It may also be performed using a specialized scan converter vacuum tube. Now we need to compute what Midpoint is for the next iteration. Assuming integral endpoints for the line segment if not then make them integral starting at the leftmost edge of the line: This scene is then rendered into the frame buffer.