fixed calibration error return

ar_tag_pose/calibration.py

@@ -67,9 +67,9 @@ class Calibration:
 		if no == ni and no > 0:
 			ret, mtx, dist, r_vecs, t_vecs = cv.calibrateCamera(self.obj_points_list, self.img_points_list, image.shape, self.mtx, self.dist,
 															  rvecs=None, tvecs=None, flags=cv.CALIB_RATIONAL_MODEL, criteria=criteria)
+			error = ret
 			if ret < thresh:
 				success = True
-				error = ret
 				self.mtx = mtx
 				self.dist = dist
 

ar_tag_pose/detector_board_main.py

@@ -207,7 +207,7 @@ class Detector(abc.ABC):
 						print(f"{det}: Points matching success")
 			elif k_ul == ord('c'):
 				gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
-				ok, calib_err = self.calibration.process(gray, thresh=3*len(self.detector))
+				ok, calib_err = self.calibration.process(gray, thresh=4*len(self.detector))
 				if ok:
 					print(f"{self.camera_name}: Calibration success: Reprojection error={calib_err:.2f}")
 					self.calibration.save(f"{RESULTS_FOLDER}/{self.camera_name}_cal.npz")