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33 lines
793 B
33 lines
793 B
// <copyright file="WelchResampler.cs" company="James South">
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// Copyright © James South and contributors.
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// Licensed under the Apache License, Version 2.0.
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// </copyright>
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namespace ImageProcessor.Samplers
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{
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/// <summary>
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/// The function implements the welch algorithm.
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/// <see href="http://www.imagemagick.org/Usage/filter/"/>
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/// </summary>
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public class WelchResampler : IResampler
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{
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/// <inheritdoc/>
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public double Radius => 3;
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/// <inheritdoc/>
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public double GetValue(double x)
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{
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if (x < 0)
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{
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x = -x;
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}
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if (x < 3)
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{
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return ImageMaths.SinC(x) * (1.0 - (x * x / 9.0));
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}
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return 0;
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}
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}
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}
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