re-render frame on active calibration

Plugins/LindtLeerformPlugin/ViewModels/CalibrationWindowViewModel.cs

@@ -130,17 +130,7 @@ public partial class CalibrationWindowViewModel : ObservableObject, IDisposable
                 _lastFrame?.Dispose();
                 _lastFrame = frame;
 
-                var displayFrame = frame;
+                var bitmap = RenderFrame(frame);
-                if (ApplyCalibration && _calibCameraMatrix != null && _calibDistCoeffs != null)
-                {
-                    displayFrame = new Mat();
-                    Cv2.Undistort(frame, displayFrame, _calibCameraMatrix, _calibDistCoeffs);
-                }
-
-                var bitmap = ImageConverter.MatToAvaloniaBitmap(displayFrame);
-
-                if (displayFrame != frame)
-                    displayFrame.Dispose();
 
                 await Dispatcher.UIThread.InvokeAsync(() =>
                 {
@@ -162,6 +152,40 @@ public partial class CalibrationWindowViewModel : ObservableObject, IDisposable
         }
     }
 
+    private Avalonia.Media.Imaging.Bitmap RenderFrame(Mat frame)
+    {
+        var displayFrame = frame;
+        if (ApplyCalibration && _calibCameraMatrix != null && _calibDistCoeffs != null)
+        {
+            displayFrame = new Mat();
+            Cv2.Undistort(frame, displayFrame, _calibCameraMatrix, _calibDistCoeffs);
+        }
+
+        var bitmap = ImageConverter.MatToAvaloniaBitmap(displayFrame);
+
+        if (displayFrame != frame)
+            displayFrame.Dispose();
+
+        return bitmap;
+    }
+
+    partial void OnApplyCalibrationChanged(bool value)
+    {
+        if (_lastFrame == null || _lastFrame.Empty()) return;
+
+        try
+        {
+            var bitmap = RenderFrame(_lastFrame);
+            var old = PreviewImage;
+            PreviewImage = bitmap;
+            old?.Dispose();
+        }
+        catch (Exception ex)
+        {
+            StatusText = $"Preview error: {ex.Message}";
+        }
+    }
+
     private void LoadCalibrationMats(Models.CalibrationData data)
     {
         _calibCameraMatrix?.Dispose();