diff --git a/Wpf_AiSportsMicrospace/JumpRopePoint.cs b/Wpf_AiSportsMicrospace/JumpRopePoint.cs
new file mode 100644
index 0000000..14d20f1
--- /dev/null
+++ b/Wpf_AiSportsMicrospace/JumpRopePoint.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wpf_AiSportsMicrospace
+{
+    public class JumpRopePoint
+    {
+        /// <summary>横坐标归一化（0~1，相对于视频显示宽度）</summary>
+        public double XNorm { get; set; }
+
+        /// <summary>纵坐标归一化（0~1，相对于视频显示高度）</summary>
+        public double YNorm { get; set; }
+
+        /// <summary>圆半径，可选，单位像素</summary>
+        public double Radius { get; set; }
+    }
+
+}
diff --git a/Wpf_AiSportsMicrospace/MainWindow.xaml.cs b/Wpf_AiSportsMicrospace/MainWindow.xaml.cs
index 3f40171..46030dd 100644
--- a/Wpf_AiSportsMicrospace/MainWindow.xaml.cs
+++ b/Wpf_AiSportsMicrospace/MainWindow.xaml.cs
@@ -76,9 +76,9 @@ public partial class MainWindow : Window
         base.OnClosed(e);
 
         // 释放 WriteableBitmap
-        _videoBitmap = null;
-        videoImage.Source = null;
-        overlayCanvas = null;
+        //_videoBitmap = null;
+        //videoImage.Source = null;
+        //overlayCanvas = null;
     }
 
     private void sportList_SelectionChanged(object sender, SelectionChangedEventArgs e)
@@ -185,6 +185,8 @@ public partial class MainWindow : Window
         // UI 线程显示
         Application.Current.Dispatcher.Invoke(() =>
         {
+            if (videoImage == null) return;
+
             if (_videoBitmap == null ||
                 _videoBitmap.PixelWidth != bitmap.PixelWidth ||
                 _videoBitmap.PixelHeight != bitmap.PixelHeight)
@@ -209,7 +211,7 @@ public partial class MainWindow : Window
             //}, System.Windows.Threading.DispatcherPriority.Loaded);
         });
 
-     
+
         //可以进一步进行人体识别等
         //var humanResult = await Task.Run(() => _humanPredictor.Predicting(buffer, frame.Number));
 
@@ -249,10 +251,10 @@ public partial class MainWindow : Window
         overlayCanvas.Height = imgHeight;
 
         // 前排 3 人（近景）
-        double frontRadius = 40;
+        double frontRadius = 60;
         var frontPositions = new List<(double XNorm, double YNorm)>
     {
-        (0.2, 0.70), (0.5, 0.70), (0.8, 0.70)  // 前排略高
+        (0.2, 0.50), (0.5, 0.50), (0.8, 0.50)  // 前排略高
     };
 
         foreach (var pos in frontPositions)
@@ -263,7 +265,7 @@ public partial class MainWindow : Window
         }
 
         // 后排 4 人（远景，更靠下面，大一点）
-        double backRadius = 50;
+        double backRadius = 60;
         var backPositions = new List<(double XNorm, double YNorm)>
     {
         (0.1, 0.88), (0.35, 0.88), (0.65, 0.88), (0.9, 0.88)  // 后排靠底
@@ -278,7 +280,7 @@ public partial class MainWindow : Window
     }
 
     /// <summary>
-    /// 添加带渐变光的圆圈
+    /// 添加带渐变光的圆圈（中心红色，边缘蓝色）
     /// </summary>
     private void AddGlowEllipse(double centerX, double centerY, double radius, double opacity, Canvas canvas)
     {
@@ -297,12 +299,15 @@ public partial class MainWindow : Window
                 RadiusY = 0.5,
                 GradientStops = new GradientStopCollection
             {
-                new GradientStop(Color.FromArgb(180, 255, 0, 0), 0), // 中心红色
-                new GradientStop(Color.FromArgb(0, 255, 0, 0), 1)    // 外部透明
+                new GradientStop(Color.FromArgb(200, 255, 0, 0), 0.0),  // 中心红
+                new GradientStop(Color.FromArgb(150, 255, 0, 0), 0.4),  // 中间仍是红
+                new GradientStop(Color.FromArgb(180, 0, 128, 255), 0.7), // 边缘蓝
+                new GradientStop(Color.FromArgb(0, 0, 128, 255), 1.0)   // 最外透明
             }
             }
         };
 
+        // 定位到中心
         Canvas.SetLeft(ellipse, centerX - radius);
         Canvas.SetTop(ellipse, centerY - radius / 2);
         canvas.Children.Add(ellipse);