mirror of https://github.com/SixLabors/ImageSharp
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33 lines
804 B
33 lines
804 B
// <copyright file="WelchResampler.cs" company="James Jackson-South">
|
|
// Copyright (c) James Jackson-South and contributors.
|
|
// Licensed under the Apache License, Version 2.0.
|
|
// </copyright>
|
|
|
|
namespace ImageProcessorCore
|
|
{
|
|
/// <summary>
|
|
/// The function implements the welch algorithm.
|
|
/// <see href="http://www.imagemagick.org/Usage/filter/"/>
|
|
/// </summary>
|
|
public class WelchResampler : IResampler
|
|
{
|
|
/// <inheritdoc/>
|
|
public float Radius => 3;
|
|
|
|
/// <inheritdoc/>
|
|
public float GetValue(float x)
|
|
{
|
|
if (x < 0)
|
|
{
|
|
x = -x;
|
|
}
|
|
|
|
if (x < 3)
|
|
{
|
|
return ImageMaths.SinC(x) * (1.0f - (x * x / 9.0f));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|