désactivation autocalibration, et correction de distortion dans l'écran de calibration

lib/services/opencv_impact_detection_service.dart

@@ -115,9 +115,10 @@ class OpenCVImpactDetectionService {
       );
 
       if (circles.rows > 0 && circles.cols > 0) {
+        // Mat shape: (1, N, 3) usually for HoughCircles (CV_32FC3)
+        // We use at<Vec3f> directly.
+
         for (int i = 0; i < circles.cols; i++) {
-          // Access circle data: x, y, radius
-          // Assuming common Vec3f layout
           final vec = circles.at<cv.Vec3f>(0, i);
           final x = vec.val1;
           final y = vec.val2;