CONVERSIE SCAN TEKSTVERWERKING PDF

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Now we need to compute what Midpoint is for the next iteration. Articles lacking in-text scqn from August All articles lacking in-text citations Articles needing additional references from August All articles needing additional references Articles with multiple maintenance issues.

How tekstverwerkinng line segments and polygons in world-space converted into illuminated pixels on the screen?

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. Note that large complex objects are often reduced down to a large number of triangles i.

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Languages Deutsch Edit links. 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. There are two distinct methods for changing a picture’s data rate:.

In a language such as OpenGL a programmer can generate a 2D line segment in world-space with code like the following: The device which performs this conversion is called a scan converter. Assuming integral endpoints for the tekstverwdrking segment if not then make them integral starting at the leftmost edge of the line: This algorithm follows from the tektsverwerking 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 article needs additional citations for verification. This conversion is done using large numbers of delay cells and is appropriate for analog conbersie.

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There is the simple braindead algorithm that works, but is too slow. To generate the outline of a triangular 2D polygon in world-space using OpenGL a programmer can write code like the following: This article has multiple issues.

Digital conversion method needs the analog video signal to be converted to digital data at the first step. Please help to improve this article by introducing more precise cobversie.

Scan conversion

Views Read Edit View history. It may also be performed using a specialized scan converter vacuum tube. Retrieved August 19, This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. Scan conversion involves changing the picture information data rate and wrapping the new picture in appropriate synchronization signals.

Learn how and when to remove these template messages. Calculate which pixels will be highlighted using the midpoint algorithm to draw a line from 5,8 to 9, Display technology Television terminology Video Video signal.

Please help improve this article by adding citations to reliable sources.

August Learn how and when to remove this tekstvsrwerking message. This works because the delta change in Tekstverwerknig from one column to the next is known to be exactly 1. In a language such as OpenGL polygons are very restricted to improve speed: 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 n2 speed, several picture processing techniques are applicable etkstverwerking the picture is stored in buffer memory including kinds of interpolation from simple to smart high order comparisons, motion detection and … to improve the picture quality and prevent the conversion artifacts.

This is the topic we will discuss now. This page was last edited on 13 Octoberat Retrieved from ” https: This allows a logical separation of the world from the view of that world. The process of representing continuous graphics objects as a collection of discrete pixels is called scan conversion. So we need more complex algorithms which use simpler operations to decrease the speed. Unsourced material may be challenged and removed. 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 By using this site, you agree to the Terms of Use and Privacy Policy.

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This scene is then rendered into the frame buffer. Then that algorithm is repeatedly refined, making it more complicated to understand, but much faster for the computer to implement.

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Then these coordinates in the viewport must be used to draw lines and polygons made up of tekstvefwerking pixels conversue. For conversion of vector images to raster images, see Rasterisation. This algorithm requires no rounding, no floating point numbers, and no multiplications. Timing, interference between digital and analog signals, clocks, noise and exact synchronization have important roles in the circuit. We like to think about a scene as mathematical primitives in a world-space. Most of the algorithms in Computer Graphics will follow the same pattern below.

The full algorithm is given in C in the white book as figure 3. Please help improve it or discuss these issues on the talk page.

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.