diff --git a/ar_tag_pose/detector_board.py b/ar_tag_pose/detector_board.py
index 84d7bc0..b053b31 100644
--- a/ar_tag_pose/detector_board.py
+++ b/ar_tag_pose/detector_board.py
@@ -44,17 +44,17 @@ class BoardDetector(abc.ABC):
 		pass
 
 	@abc.abstractmethod
-	def match_points(self, image: cv.typing.MatLike):
+	def match_points(self, image: np.ndarray):
 		pass
 
 	@abc.abstractmethod
-	def process(self, image: cv.typing.MatLike, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=True) -> (bool, np.ndarray, np.ndarray):
+	def process(self, image: np.ndarray, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=True) -> (bool, np.ndarray, np.ndarray):
 		pass
 
 	def is_calibrated(self):
 		return self.mtx is not None and self.dist is not None
 
-	def collect_points(self, image: cv.typing.MatLike) -> bool:
+	def collect_points(self, image: np.ndarray) -> bool:
 		success, obj_points, img_points = self.match_points(image)
 		if success:
 			self.obj_points_list.append(obj_points)
@@ -79,7 +79,7 @@ class BoardDetector(abc.ABC):
 	def calibration_get(self):
 		return self.mtx, self.dist, self.r_vecs, self.t_vecs
 
-	def calibrate_camera(self, image: cv.typing.MatLike, r_vecs=None, t_vecs=None, flags=0):
+	def calibrate_camera(self, image: np.ndarray, r_vecs=None, t_vecs=None, flags=0):
 		success = False
 		if len(self.obj_points_list) > 0 and len(self.img_points_list) > 0:
 			ret, mtx, dist, r_vecs, t_vecs = cv.calibrateCamera(self.obj_points_list, self.img_points_list, image.shape, self.mtx, self.dist,
diff --git a/ar_tag_pose/detector_board_aruco.py b/ar_tag_pose/detector_board_aruco.py
index 39a2ff7..878b4ca 100644
--- a/ar_tag_pose/detector_board_aruco.py
+++ b/ar_tag_pose/detector_board_aruco.py
@@ -31,7 +31,7 @@ class BoardDetectorAruco(BoardDetector):
 		image = self.board.generateImage(image_size, None, margin_length, 1)
 		return image
 
-	def match_points(self, image: cv.typing.MatLike):
+	def match_points(self, image: np.ndarray):
 		success = False
 		obj_points = None
 		img_points = None
@@ -48,7 +48,7 @@ class BoardDetectorAruco(BoardDetector):
 
 		return success, obj_points, img_points
 
-	def process(self, image: cv.typing.MatLike, r_vecs: np.ndarray=None, t_vecs: np.ndarray=None, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=False):
+	def process(self, image: np.ndarray, r_vecs: np.ndarray=None, t_vecs: np.ndarray=None, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=False):
 		pose = False
 		r_vec = None
 		t_vec = None
diff --git a/ar_tag_pose/detector_board_charuco.py b/ar_tag_pose/detector_board_charuco.py
index 87354ae..4aff43f 100644
--- a/ar_tag_pose/detector_board_charuco.py
+++ b/ar_tag_pose/detector_board_charuco.py
@@ -32,7 +32,7 @@ class BoardDetectorCharuco(BoardDetector):
 		image = self.board.generateImage(image_size, None, margin_length, 1)
 		return image
 
-	def match_points(self, image: cv.typing.MatLike):
+	def match_points(self, image: np.ndarray):
 		success = False
 		obj_points = None
 		img_points = None
@@ -49,7 +49,7 @@ class BoardDetectorCharuco(BoardDetector):
 
 		return success, obj_points, img_points
 
-	def process(self, image: cv.typing.MatLike, r_vecs: np.ndarray=None, t_vecs: np.ndarray=None, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=False):
+	def process(self, image: np.ndarray, r_vecs: np.ndarray=None, t_vecs: np.ndarray=None, draw_marker_box=True, draw_marker_id=False, draw_marker_axis=False):
 		pose = False
 		r_vec = None
 		t_vec = None