已合并 PR 59: 更改气泡筛选逻辑

1.加载新图像时会自动清除旧的测量结果、叠加层和ROI
2.更改气泡筛选逻辑：按照面积筛选，去除小于设定面积的气泡重新计算空隙率更新结果图像

XP.ImageProcessing.Processors/检测分析/BgaVoidRateProcessor.cs

@@ -333,14 +333,13 @@ public class BgaVoidRateProcessor : ImageProcessorBase
         }
 
         int voidPixels = CvInvoke.CountNonZero(voidImg);
-        bga.VoidPixels = voidPixels;
-        bga.VoidRate = bgaPixels > 0 ? (double)voidPixels / bgaPixels * 100.0 : 0;
 
         // 检测每个气泡的轮廓
         using var contours = new VectorOfVectorOfPoint();
         using var hierarchy = new Mat();
         CvInvoke.FindContours(voidImg, contours, hierarchy, RetrType.External, ChainApproxMethod.ChainApproxSimple);
 
+        int filteredVoidArea = 0;
         for (int i = 0; i < contours.Size; i++)
         {
             double area = CvInvoke.ContourArea(contours[i]);
@@ -349,6 +348,7 @@ public class BgaVoidRateProcessor : ImageProcessorBase
             var moments = CvInvoke.Moments(contours[i]);
             if (moments.M00 < 1) continue;
 
+            filteredVoidArea += (int)Math.Round(area);
             bga.Voids.Add(new VoidInfo
             {
                 Index = bga.Voids.Count + 1,
@@ -361,6 +361,10 @@ public class BgaVoidRateProcessor : ImageProcessorBase
             });
         }
 
+        // 空隙率基于过滤后的轮廓面积计算
+        bga.VoidPixels = filteredVoidArea;
+        bga.VoidRate = bgaPixels > 0 ? (double)filteredVoidArea / bgaPixels * 100.0 : 0;
+
         // 按面积从大到小排序
         bga.Voids.Sort((a, b) => b.Area.CompareTo(a.Area));
         for (int i = 0; i < bga.Voids.Count; i++) bga.Voids[i].Index = i + 1;

XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs

@@ -123,7 +123,6 @@ namespace XP.ImageProcessing.RoiControl.Controls
             var control = (PolygonRoiCanvas)d;
             if (e.NewValue is BitmapSource bitmap)
             {
-                // 使用像素尺寸，避免 DPI 不同导致 DIP 尺寸与实际像素不一致
                 control.CanvasWidth = bitmap.PixelWidth;
                 control.CanvasHeight = bitmap.PixelHeight;
                 control.ResetView();
@@ -135,6 +134,11 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 control.ResetView();
             }
 
+            // 图像切换时清除测量、叠加层和ROI
+            control.ClearMeasurements();
+            control.ROIItems?.Clear();
+            control.SelectedROI = null;
+
             // 图像尺寸变化后刷新十字线
             if (control.ShowCrosshair)
                 control.AddCrosshair();