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@@ -0,0 +1,90 @@
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+using System;
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+using System.Collections.Generic;
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+using System.Drawing;
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+using System.Drawing.Imaging;
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+using System.IO;
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+using System.Linq;
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+using System.Text;
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+using System.Threading.Tasks;
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+using System.Windows.Media.Imaging;
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+
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+namespace MvvmScaffoldFrame48.DLL.ImageAlgorithm
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+{
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+ public static class ImageAlgorithmTools
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+ {
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+ public static Bitmap CropBitmap(Bitmap sourceBitmap, Rectangle roi)
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+ {
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+ // 检查边界
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+ if (roi.X < 0 || roi.Y < 0 ||
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+ roi.Right > sourceBitmap.Width ||
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+ roi.Bottom > sourceBitmap.Height)
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+ {
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+ throw new ArgumentException("ROI区域超出源图像边界");
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+ }
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+
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+ // 创建目标位图
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+ Bitmap result = new Bitmap(roi.Width, roi.Height, sourceBitmap.PixelFormat);
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+
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+ // 锁定位图数据
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+ BitmapData sourceData = sourceBitmap.LockBits(
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+ new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height),
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+ ImageLockMode.ReadOnly,
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+ sourceBitmap.PixelFormat);
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+
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+ BitmapData resultData = result.LockBits(
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+ new Rectangle(0, 0, result.Width, result.Height),
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+ ImageLockMode.WriteOnly,
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+ result.PixelFormat);
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+
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+ try
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+ {
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+ unsafe
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+ {
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+ byte* sourcePtr = (byte*)sourceData.Scan0;
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+ byte* resultPtr = (byte*)resultData.Scan0;
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+
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+ int pixelSize = Image.GetPixelFormatSize(sourceBitmap.PixelFormat) / 8;
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+ int sourceStride = sourceData.Stride;
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+ int resultStride = resultData.Stride;
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+
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+ for (int y = 0; y < roi.Height; y++)
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+ {
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+ byte* srcRow = sourcePtr + (roi.Y + y) * sourceStride + roi.X * pixelSize;
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+ byte* dstRow = resultPtr + y * resultStride;
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+
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+ // 复制一行像素数据
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+ for (int x = 0; x < roi.Width * pixelSize; x++)
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+ {
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+ dstRow[x] = srcRow[x];
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+ }
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+ }
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+ }
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+ }
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+ finally
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+ {
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+ sourceBitmap.UnlockBits(sourceData);
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+ result.UnlockBits(resultData);
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+ }
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+
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+ return result;
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+ }
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+
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+ // Bitmap 转 BitmapImage 的辅助方法
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+ public static BitmapImage ConvertToBitmapImage(Bitmap bitmap)
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+ {
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+ using (MemoryStream memory = new MemoryStream())
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+ {
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+ bitmap.Save(memory, System.Drawing.Imaging.ImageFormat.Png);
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+ memory.Position = 0;
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+ var bitmapImage = new BitmapImage();
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+ bitmapImage.BeginInit();
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+ bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
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+ bitmapImage.DecodePixelWidth = 1440; // 设置目标分辨率宽度
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+ bitmapImage.DecodePixelHeight = 1080; // 保持宽高比
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+ bitmapImage.StreamSource = memory;
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+ bitmapImage.EndInit();
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+ return bitmapImage;
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+ }
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+ }
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+ }
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+}
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