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POAffine transform with interpolation
 

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    <p>I would like to do an affine transformation on a very low resolution bitmap and I would like to do it while preserving the maximum amount of information.</p> <p>My input data is a 1 bit 64-by-64 pixel image of hand written character and my output would be greyscale and higher resolution. Upon analysing the image I construct a series of affine transformations (rotation, scaling, shear, translation) what I could multiply into a single affine transformation matrix.</p> <p>My problem is that given the <strong>input image</strong> and my computed <strong>affine transformation matrix</strong>, how can I calculate my output image in the highest possible quality? I have read articles about different interpolation techniques, but all of them are about how to do interpolation for scaling, and not for general affine transforms.</p> <p>Here is a demo what is doing exactly what I am looking for. Given an affine transformation matrix and an interpolation technique it calculates an image.</p> <p><a href="http://bigwww.epfl.ch/demo/jaffine/index.html" rel="nofollow">http://bigwww.epfl.ch/demo/jaffine/index.html</a></p> <p><strong>Can you explain me what are the steps required for calculating a higher resolution (for example 4x) greyscale image, if I have a lower resolution 1-bit input and a given T affine transformation matrix?</strong></p> <p>Can you link me to some <strong><em>source code</em></strong> or <strong><em>tutorials</em></strong> or <strong><em>articles</em></strong> or possibly even <strong><em>books</em></strong> about how to implement a linear, cubic or better interpolation with affine transform?</p> <p>I need to implement this problem in Java, and I know Java has an Affine class, but I don't know if it implements interpolation. Do you know any C++ or Java library what has nice to read code for figuring out how to write an algorithm for doing affine transform using interpolation?</p> <p><strong>Are there any freely available libraries for Java or C++ which have built-in functions for calculating affine transform using interpolation?</strong></p>
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    1. COYou can do affine transforms with anti-aliasing in java with the java2d api
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    2. COHave you considered using SVG images which scale much nicer than standard bitmap images? Apache's [Batik library](http://xmlgraphics.apache.org/batik/) works with Java and can handle this for you I believe.
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    3. CO@sibbo: that helps with Shapes, but won't help for bitmapped images.
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