李伟
100 lines
3.1 KiB
C#
100 lines
3.1 KiB
C#
// ============================================================================
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// Copyright © 2026 Hexagon Technology Center GmbH. All Rights Reserved.
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// 文件名: GammaProcessor.cs
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// 描述: Gamma校正算子，用于调整图像亮度和对比度
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// 功能:
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// - Gamma非线性校正
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// - 增益调整
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// - 使用查找表（LUT）加速处理
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// - 适用于图像显示和亮度调整
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// 算法: Gamma校正公式 output = (input^(1/gamma)) * gain
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// 作者: 李伟 wei.lw.li@hexagon.com
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// ============================================================================
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using Emgu.CV;
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using Emgu.CV.Structure;
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using XP.ImageProcessing.Core;
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using Serilog;
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namespace XP.ImageProcessing.Processors;
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/// <summary>
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/// Gamma校正算子
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/// </summary>
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public class GammaProcessor : ImageProcessorBase
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{
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private byte[] _lookupTable;
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private static readonly ILogger _logger = Log.ForContext<GammaProcessor>();
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public GammaProcessor()
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{
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Name = LocalizationHelper.GetString("GammaProcessor_Name");
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Description = LocalizationHelper.GetString("GammaProcessor_Description");
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_lookupTable = new byte[256];
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}
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protected override void InitializeParameters()
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{
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Parameters.Add("Gamma", new ProcessorParameter(
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"Gamma",
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LocalizationHelper.GetString("GammaProcessor_Gamma"),
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typeof(double),
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1.0,
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0.1,
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5.0,
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LocalizationHelper.GetString("GammaProcessor_Gamma_Desc")));
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Parameters.Add("Gain", new ProcessorParameter(
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"Gain",
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LocalizationHelper.GetString("GammaProcessor_Gain"),
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typeof(double),
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1.0,
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0.1,
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3.0,
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LocalizationHelper.GetString("GammaProcessor_Gain_Desc")));
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_logger.Debug("InitializeParameters");
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}
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public override Image<Gray, byte> Process(Image<Gray, byte> inputImage)
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{
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double gamma = GetParameter<double>("Gamma");
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double gain = GetParameter<double>("Gain");
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BuildLookupTable(gamma, gain);
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var result = inputImage.Clone();
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ApplyLookupTable(result);
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_logger.Debug("Process:Gamma = {0}, Gain = {1}", gamma, gain);
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return result;
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}
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private void BuildLookupTable(double gamma, double gain)
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{
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double invGamma = 1.0 / gamma;
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for (int i = 0; i < 256; i++)
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{
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double normalized = i / 255.0;
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double corrected = Math.Pow(normalized, invGamma) * gain;
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int value = (int)(corrected * 255.0);
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_lookupTable[i] = (byte)Math.Max(0, Math.Min(255, value));
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}
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_logger.Debug("Gamma and gain values recorded: gamma = {Gamma}, gain = {Gain}", gamma, gain);
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}
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private void ApplyLookupTable(Image<Gray, byte> image)
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{
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int width = image.Width;
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int height = image.Height;
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for (int y = 0; y < height; y++)
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{
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for (int x = 0; x < width; x++)
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{
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byte pixelValue = image.Data[y, x, 0];
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image.Data[y, x, 0] = _lookupTable[pixelValue];
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}
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}
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}
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} |