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POFastSineTransformer - pad array with zeros to fit length
 

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  1. POFastSineTransformer - pad array with zeros to fit length
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    <p>I'm trying to implement a poisson solver for image blending in <strong>Java</strong>. After descretization with 5-star method, the real work begins. To do that i do these three steps with the color values:</p> <ol> <li>using sine transformation on rows and columns</li> <li>multiply eigenvalues</li> <li>using inverse sine transformation on rows an columns</li> </ol> <p>This works so far. To do the sine transformation in Java, i'm using the Apache Commons Math package.</p> <p>But the <a href="http://ommons.apache.org/math/apidocs/org/apache/commons/math3/transform/FastSineTransformer.html" rel="nofollow" title="FastSineTransformer">FastSineTransformer</a> has two limitations:</p> <ol> <li>first value in the array must be zero (well that's ok, number two is the real problem)</li> <li>the length of the input must be a <strong>power of two</strong></li> </ol> <p>So right now my excerpts are of the length 127, 255 and so on to fit in. (i'm inserting a zero in the beginning, so that 1 and 2 are fulfilled) That's pretty stupid, because i want to choose the size of my excerpt freely.</p> <p>My Question is: <strong>Is there a way to extend my array e.g. of length 100 to fit the limitations of the Apache FastSineTransformer?</strong></p> <p>In the FastFourierTransfomer class it is mentioned, that you can pad with zeros to get a power of two. But when i do that, i get wrong results. Perhaps i'm doing it wrong, but i really don't know if there is anything i have to keep in mind, when i'm padding with zeros</p>
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