Tag Archives: image processing

Anti-aliasing for improving image quality

About a year ago I have briefly shown in my post “smoothing images” that averaging can be important to get good images without pixel noise. For my kaleidoscope app, see http://geometricolor.ch/sphericalKaleidoscopeApp.html, I have improved on these ideas and that’s what … Continue reading

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Combinations of mirror symmetries

We now create rosettes with combinations of the two mirror symmetries. We can put them¬†in “parallel” or in “series”. In “parallel” means that the rosette has both symmetries at the same time and thus the mapping functions have to obey … Continue reading

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Rosettes with mirror symmetry

The program for making rosettes offers many¬†possibilities and it is difficult to find something to aim for. As a guide we can use symmetries. Mirror symmetry at the x-axis is a simple example. It makes that the image remains unchanged … Continue reading

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How to generate rosettes

A rosette is an image with rotational symmetry. For p-fold symmetry we can use the methods of the last post “Anamorphosis and symmetries” with a simple power as a mapping function between output and input images: Here z=x+iy relates to … Continue reading

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class MakeOutputImage – the code

//  this class is a framework for generating output images //needs the class ProgressReport class MakeOutputImage{   ProgressReport progress;   PImage thisImage;   int thisWidth, thisHeight;   int rot,gruen,blau;   int startTime,lastTime;     int[] inRed,inGreen,inBlue;   int[] redPlus,redZero,redMinus;   … Continue reading

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class MakeOutputImage with anti-aliasing

In the earlier post “Smoothing and anti-aliasing” I discussed how to smooth images and reduce aliasing.This is an important part of the class MakeOutputImage. This class is rather a template for programming and not a finished module. You find its … Continue reading

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Smoothing and anti-aliasing

Aliasing arises if you want to show a structure that varies rapidly within the distance between pixels. Then you will see artefacts that are quite different. We can use this to get new strange images such as I showed in … Continue reading

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