优化：修复Logger类型错误，重写CLAHE算法，像素遍历改用unsafe指针加速

XP.ImageProcessing.Processors/图像变换/ThresholdProcessor.cs

@@ -73,27 +73,30 @@ public class ThresholdProcessor : ImageProcessorBase
 
         if (useOtsu)
         {
-            // 使用Otsu算法
             CvInvoke.Threshold(inputImage, result, minThreshold, 255, ThresholdType.Otsu);
             _logger.Debug("Process: UseOtsu = true");
         }
         else
         {
-            // 双阈值分割：介于MinThreshold和MaxThreshold之间的为前景(255)，其他为背景(0)
-            byte[,,] inputData = inputImage.Data;
-            byte[,,] outputData = result.Data;
-
             int height = inputImage.Height;
             int width = inputImage.Width;
 
-            for (int y = 0; y < height; y++)
+            unsafe
             {
-                for (int x = 0; x < width; x++)
+                byte* srcPtr = (byte*)inputImage.Mat.DataPointer;
+                byte* dstPtr = (byte*)result.Mat.DataPointer;
+                int srcStep = inputImage.Mat.Step;
+                int dstStep = result.Mat.Step;
+
+                for (int y = 0; y < height; y++)
                 {
-                    byte pixelValue = inputData[y, x, 0];
-                    outputData[y, x, 0] = (pixelValue >= minThreshold && pixelValue <= maxThreshold)
-                        ? (byte)255
-                        : (byte)0;
+                    byte* srcRow = srcPtr + y * srcStep;
+                    byte* dstRow = dstPtr + y * dstStep;
+                    for (int x = 0; x < width; x++)
+                    {
+                        byte val = srcRow[x];
+                        dstRow[x] = (val >= minThreshold && val <= maxThreshold) ? (byte)255 : (byte)0;
+                    }
                 }
             }