2xSaI is a digital image processing algorithm for computer graphics. It doubles the images both horizontally and vertically, resulting in a new image with four times as many pixels as the original one. The additional pixels are generated by detecting patterns such as lines and edges and interpolating additional pixels on that basis using techniques such as anti-aliasing and Wu lines. For many types of computer graphics, this results in a sharper and clearer image than standard bilinear filtering. Digital image processing is the use of algorithms to perform image processing on digital images. ... Computer graphics (CG) is the field of visual computing, where one utilizes computers both to generate visual images synthetically and to integrate or alter visual and spatial information sampled from the real world. ... In the mathematical subfield of numerical analysis, interpolation is a method of constructing new data points from a discrete set of known data points. ... In digital signal processing, anti-aliasing is the technique of minimizing aliasing when representing a high-resolution signal at a lower resolution. ... Xiaolin Wus line algorithm is an algorithm for line antialiasing, which was presented in the article An Efficient Antialiasing Technique in the July 1991 issue of Computer Graphics, as well as in the article Fast Antialiasing in the June 1992 issue of Dr. Dobbs Journal. ... Bilinear filtering is a texture mapping method used to smooth textures when displayed larger or smaller than they actually are. ...
An image from Super Mario Bros. 3 with nearest-neighbor scaling (left) and Super 2xSaI scaling (right).
The 2xSaI algorithm was designed by Derek Liauw Kie Fa, a.k.a. Kreed, primarily for use in console and computer emulators, and it has remained fairly popular in this niche. Many of the most popular emulators, including ZSNES, VisualBoyAdvance, and Nestopia, offer this scaling algorithm as a feature. Since Kreed released the source code under the GNU General Public License, it is freely available to anyone wishing to utilize it in an open source project. Several slightly different versions of the scaling algorithm are available, and these are often referred to as "Super 2xSaI", "2xSaI", and "Super Eagle". Super Mario Bros. ... This article is about emulation in computer science. ... ZSNES is an acclaimed emulator for video games made to run on the Super Famicom and SNES. It was first developed by pseudonymous programmers and released on the Internet in 1997. ... VisualBoyAdvance (VBA) is a Free Software emulator distributed under the terms of the GNU General Public License. ... Nestopia is a open source GPL Nintendo Entertainment System (NES) emulator for Windows. ... The GNU logo For other uses of GPL, see GPL (disambiguation). ...
2xSaI works has yet to be written (when this 17 year old has some more time)...
I don't need complicated math or formulas, I'm just more or less looking for a some details on what steps are taken and how they relate to the final image...
Just a bunch of if statements or switch should be enough to program a simple 2xsai engine.
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