李伟
128 lines
4.7 KiB
C#
128 lines
4.7 KiB
C#
// ============================================================================
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// Copyright © 2016-2025 Hexagon Technology Center GmbH. All Rights Reserved.
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// 文件名: SubPixelZoomProcessor.cs
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// 描述: 亚像素放大算子，通过高质量插值实现图像的亚像素级放大
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// 功能:
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// - 支持任意倍率放大（含小数倍率如 1.5x、2.3x）
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// - 多种插值方法（最近邻、双线性、双三次、Lanczos）
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// - 可选锐化补偿（抵消插值模糊）
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// - 可选指定输出尺寸
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// 算法: 基于 OpenCV Resize 的高质量插值放大
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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.CvEnum;
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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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using System.Drawing;
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namespace XP.ImageProcessing.Processors;
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/// <summary>
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/// 亚像素放大算子
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/// </summary>
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public class SubPixelZoomProcessor : ImageProcessorBase
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{
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private static readonly ILogger _logger = Log.ForContext<SubPixelZoomProcessor>();
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public SubPixelZoomProcessor()
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{
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Name = LocalizationHelper.GetString("SubPixelZoomProcessor_Name");
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Description = LocalizationHelper.GetString("SubPixelZoomProcessor_Description");
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}
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protected override void InitializeParameters()
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{
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Parameters.Add("ScaleFactor", new ProcessorParameter(
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"ScaleFactor",
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LocalizationHelper.GetString("SubPixelZoomProcessor_ScaleFactor"),
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typeof(double),
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2.0,
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1.0,
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16.0,
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LocalizationHelper.GetString("SubPixelZoomProcessor_ScaleFactor_Desc")));
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Parameters.Add("Interpolation", new ProcessorParameter(
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"Interpolation",
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LocalizationHelper.GetString("SubPixelZoomProcessor_Interpolation"),
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typeof(string),
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"Lanczos",
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null,
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null,
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LocalizationHelper.GetString("SubPixelZoomProcessor_Interpolation_Desc"),
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new string[] { "Nearest", "Bilinear", "Bicubic", "Lanczos" }));
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Parameters.Add("SharpenAfter", new ProcessorParameter(
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"SharpenAfter",
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LocalizationHelper.GetString("SubPixelZoomProcessor_SharpenAfter"),
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typeof(bool),
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false,
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null,
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null,
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LocalizationHelper.GetString("SubPixelZoomProcessor_SharpenAfter_Desc")));
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Parameters.Add("SharpenStrength", new ProcessorParameter(
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"SharpenStrength",
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LocalizationHelper.GetString("SubPixelZoomProcessor_SharpenStrength"),
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typeof(double),
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0.5,
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0.1,
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3.0,
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LocalizationHelper.GetString("SubPixelZoomProcessor_SharpenStrength_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 scaleFactor = GetParameter<double>("ScaleFactor");
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string interpolation = GetParameter<string>("Interpolation");
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bool sharpenAfter = GetParameter<bool>("SharpenAfter");
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double sharpenStrength = GetParameter<double>("SharpenStrength");
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Inter interMethod = interpolation switch
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{
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"Nearest" => Inter.Nearest,
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"Bilinear" => Inter.Linear,
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"Bicubic" => Inter.Cubic,
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_ => Inter.Lanczos4
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};
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int newWidth = (int)Math.Round(inputImage.Width * scaleFactor);
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int newHeight = (int)Math.Round(inputImage.Height * scaleFactor);
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// 确保最小尺寸为 1
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newWidth = Math.Max(1, newWidth);
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newHeight = Math.Max(1, newHeight);
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var result = new Image<Gray, byte>(newWidth, newHeight);
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CvInvoke.Resize(inputImage, result, new Size(newWidth, newHeight), 0, 0, interMethod);
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// 锐化补偿
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if (sharpenAfter)
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{
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// Unsharp Masking: result = result + strength * (result - blur)
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int ksize = Math.Max(3, (int)(scaleFactor * 2) | 1); // 奇数核
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using var blurred = result.SmoothGaussian(ksize);
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for (int y = 0; y < newHeight; y++)
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{
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for (int x = 0; x < newWidth; x++)
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{
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float val = result.Data[y, x, 0];
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float blur = blurred.Data[y, x, 0];
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float sharpened = val + (float)(sharpenStrength * (val - blur));
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result.Data[y, x, 0] = (byte)Math.Clamp((int)sharpened, 0, 255);
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}
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}
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}
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_logger.Debug("Process: Scale={Scale}, Interp={Interp}, Size={W}x{H}, Sharpen={Sharpen}",
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scaleFactor, interpolation, newWidth, newHeight, sharpenAfter);
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return result;
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}
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}
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