C#实现图片边缘锐化的完整代码

[ 0, -1,  0][-1,  5, -1][ 0, -1,  0]

dotnet add package System.Drawing.Common

using System;using System.Drawing;using System.Drawing.Imaging;
public class ImageProcessor
{
    public static Bitmap ApplyConvolutionFilter(Bitmap sourceImage, float[,] kernel)
    {
        int width = sourceImage.Width;
        int height = sourceImage.Height;
        BitmapData srcData = sourceImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
        Bitmap resultImage = new Bitmap(width, height);
        BitmapData resultData = resultImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);

        int bytesPerPixel = 4;
        int stride = srcData.Stride;
        IntPtr srcScan0 = srcData.Scan0;
        IntPtr resultScan0 = resultData.Scan0;
        int kernelWidth = kernel.GetLength(1);
        int kernelHeight = kernel.GetLength(0);
        int kernelOffset = kernelWidth / 2;

        unsafe
        {
            byte* srcPtr = (byte*)srcScan0.ToPointer();
            byte* resultPtr = (byte*)resultScan0.ToPointer();

            for (int y = kernelOffset; y < height - kernelOffset; y++)
            {
                for (int x = kernelOffset; x < width - kernelOffset; x++)
                {
                    float blue = 0.0f;
                    float green = 0.0f;
                    float red = 0.0f;

                    for (int ky = -kernelOffset; ky <= kernelOffset; ky++)
                    {
                        for (int kx = -kernelOffset; kx <= kernelOffset; kx++)
                        {
                            int pixelPos = ((y + ky) * stride) + ((x + kx) * bytesPerPixel);
                            blue += srcPtr[pixelPos] * kernel[ky + kernelOffset, kx + kernelOffset];
                            green += srcPtr[pixelPos + 1] * kernel[ky + kernelOffset, kx + kernelOffset];
                            red += srcPtr[pixelPos + 2] * kernel[ky + kernelOffset, kx + kernelOffset];
                        }
                    }

                    int resultPos = (y * stride) + (x * bytesPerPixel);
                    resultPtr[resultPos] = (byte)Math.Min(Math.Max(blue, 0), 255);
                    resultPtr[resultPos + 1] = (byte)Math.Min(Math.Max(green, 0), 255);
                    resultPtr[resultPos + 2] = (byte)Math.Min(Math.Max(red, 0), 255);
                    resultPtr[resultPos + 3] = srcPtr[resultPos + 3]; // Copy alpha channel
                }
            }
        }

        sourceImage.UnlockBits(srcData);
        resultImage.UnlockBits(resultData);

        return resultImage;
    }
}

using System;using System.Drawing;
class Program
{
    static void Main()
    {
        // 加载原始图像
        Bitmap sourceImage = new Bitmap("path_to_your_image.jpg");

        // 定义锐化卷积核
        float[,] sharpenKernel = new float[,]
        {
            { 0, -1,  0 },
            { -1,  5, -1 },
            { 0, -1,  0 }
        };

        // 应用锐化滤波器
        Bitmap resultImage = ImageProcessor.ApplyConvolutionFilter(sourceImage, sharpenKernel);

        // 保存处理后的图像
        resultImage.Save("path_to_save_sharpened_image.jpg");
    }
}