diff --git a/src/arcaea_offline_ocr/masker/__init__.py b/src/arcaea_offline_ocr/masker/__init__.py
index a21c811..fd4f408 100644
--- a/src/arcaea_offline_ocr/masker/__init__.py
+++ b/src/arcaea_offline_ocr/masker/__init__.py
@@ -1,2 +1,2 @@
-from .auto import AutoMasker, AutoMaskerT1, AutoMaskerT2
-from .common import Masker
+from .auto import *
+from .common import DeviceRoiMasker
diff --git a/src/arcaea_offline_ocr/masker/auto/__init__.py b/src/arcaea_offline_ocr/masker/auto/__init__.py
index edc1e5a..cc84af6 100644
--- a/src/arcaea_offline_ocr/masker/auto/__init__.py
+++ b/src/arcaea_offline_ocr/masker/auto/__init__.py
@@ -1,3 +1,3 @@
-from .common import AutoMasker
-from .t1 import AutoMaskerT1
-from .t2 import AutoMaskerT2
+from .common import DeviceAutoRoiMasker
+from .t1 import DeviceAutoRoiMaskerT1
+from .t2 import DeviceAutoRoiMaskerT2
diff --git a/src/arcaea_offline_ocr/masker/auto/common.py b/src/arcaea_offline_ocr/masker/auto/common.py
index 8ead91f..ed725d2 100644
--- a/src/arcaea_offline_ocr/masker/auto/common.py
+++ b/src/arcaea_offline_ocr/masker/auto/common.py
@@ -1,5 +1,5 @@
-from ..common import Masker
+from ..common import DeviceRoiMasker
 
 
-class AutoMasker(Masker):
+class DeviceAutoRoiMasker(DeviceRoiMasker):
     ...
diff --git a/src/arcaea_offline_ocr/masker/auto/t1.py b/src/arcaea_offline_ocr/masker/auto/t1.py
index ee26ecc..84ba4a8 100644
--- a/src/arcaea_offline_ocr/masker/auto/t1.py
+++ b/src/arcaea_offline_ocr/masker/auto/t1.py
@@ -1,7 +1,7 @@
 import cv2
 import numpy as np
 
-from .common import AutoMasker
+from .common import DeviceAutoRoiMasker
 
 GRAY_BGR_MIN = np.array([50] * 3, np.uint8)
 GRAY_BGR_MAX = np.array([160] * 3, np.uint8)
@@ -34,7 +34,7 @@ PURE_MEMORY_HSV_MIN = np.array([90, 70, 80], np.uint8)
 PURE_MEMORY_HSV_MAX = np.array([110, 200, 175], np.uint8)
 
 
-class AutoMaskerT1(AutoMasker):
+class DeviceAutoRoiMaskerT1(DeviceAutoRoiMasker):
     @classmethod
     def gray(cls, roi_bgr: cv2.Mat) -> cv2.Mat:
         bgr_value_equal_mask = np.max(roi_bgr, axis=2) - np.min(roi_bgr, axis=2) <= 5
diff --git a/src/arcaea_offline_ocr/masker/auto/t2.py b/src/arcaea_offline_ocr/masker/auto/t2.py
index 2c1981a..430a3fb 100644
--- a/src/arcaea_offline_ocr/masker/auto/t2.py
+++ b/src/arcaea_offline_ocr/masker/auto/t2.py
@@ -1,7 +1,7 @@
 import cv2
 import numpy as np
 
-from .common import AutoMasker
+from .common import DeviceAutoRoiMasker
 
 PFL_HSV_MIN = np.array([0, 0, 248], np.uint8)
 PFL_HSV_MAX = np.array([179, 10, 255], np.uint8)
@@ -38,7 +38,7 @@ PURE_MEMORY_HSV_MIN = np.array([90, 70, 80], np.uint8)
 PURE_MEMORY_HSV_MAX = np.array([110, 200, 175], np.uint8)
 
 
-class AutoMaskerT2(AutoMasker):
+class DeviceAutoRoiMaskerT2(DeviceAutoRoiMasker):
     @classmethod
     def pfl(cls, roi_bgr: cv2.Mat) -> cv2.Mat:
         return cv2.inRange(
diff --git a/src/arcaea_offline_ocr/masker/common.py b/src/arcaea_offline_ocr/masker/common.py
index fabbd55..39bbaf6 100644
--- a/src/arcaea_offline_ocr/masker/common.py
+++ b/src/arcaea_offline_ocr/masker/common.py
@@ -1,7 +1,7 @@
 import cv2
 
 
-class Masker:
+class DeviceRoiMasker:
     @classmethod
     def pure(cls, roi_bgr: cv2.Mat) -> cv2.Mat:
         raise NotImplementedError()
diff --git a/src/arcaea_offline_ocr/roi_extractor/__init__.py b/src/arcaea_offline_ocr/roi_extractor/__init__.py
index c288e7f..050378c 100644
--- a/src/arcaea_offline_ocr/roi_extractor/__init__.py
+++ b/src/arcaea_offline_ocr/roi_extractor/__init__.py
@@ -1,2 +1,2 @@
-from .common import Extractor
+from .common import DeviceRoiExtractor
 from .sizes import *
diff --git a/src/arcaea_offline_ocr/roi_extractor/common.py b/src/arcaea_offline_ocr/roi_extractor/common.py
index 01c7965..8bb106e 100644
--- a/src/arcaea_offline_ocr/roi_extractor/common.py
+++ b/src/arcaea_offline_ocr/roi_extractor/common.py
@@ -1,11 +1,11 @@
 import cv2
 
 from ..crop import crop_xywh
-from .sizes.common import Sizes
+from .sizes.common import DeviceRoiSizes
 
 
-class Extractor:
-    def __init__(self, img: cv2.Mat, sizes: Sizes):
+class DeviceRoiExtractor:
+    def __init__(self, img: cv2.Mat, sizes: DeviceRoiSizes):
         self.img = img
         self.sizes = sizes
 
diff --git a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/__init__.py b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/__init__.py
index 681ed11..270a1e0 100644
--- a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/__init__.py
+++ b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/__init__.py
@@ -1,3 +1,3 @@
-from .common import AutoSizes
-from .t1 import AutoSizesT1
-from .t2 import AutoSizesT2
+from .common import DeviceAutoRoiSizes
+from .t1 import DeviceAutoRoiSizesT1
+from .t2 import DeviceAutoRoiSizesT2
diff --git a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/common.py b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/common.py
index 66d42e6..a6e9c11 100644
--- a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/common.py
+++ b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/common.py
@@ -1,7 +1,7 @@
-from ..common import Sizes
+from ..common import DeviceRoiSizes
 
 
-class AutoSizes(Sizes):
+class DeviceAutoRoiSizes(DeviceRoiSizes):
     def __init__(self, w: int, h: int):
         self.w = w
         self.h = h
diff --git a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t1.py b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t1.py
index 415e065..291a29c 100644
--- a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t1.py
+++ b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t1.py
@@ -1,7 +1,7 @@
-from .common import AutoSizes
+from .common import DeviceAutoRoiSizes
 
 
-class AutoSizesT1(AutoSizes):
+class DeviceAutoRoiSizesT1(DeviceAutoRoiSizes):
     @property
     def factor(self):
         return (
diff --git a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t2.py b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t2.py
index a99107c..f214da0 100644
--- a/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t2.py
+++ b/src/arcaea_offline_ocr/roi_extractor/sizes/auto/t2.py
@@ -1,7 +1,7 @@
-from .common import AutoSizes
+from .common import DeviceAutoRoiSizes
 
 
-class AutoSizesT2(AutoSizes):
+class DeviceAutoRoiSizesT2(DeviceAutoRoiSizes):
     @property
     def factor(self):
         return (
diff --git a/src/arcaea_offline_ocr/roi_extractor/sizes/common.py b/src/arcaea_offline_ocr/roi_extractor/sizes/common.py
index fa85a20..f4ef4a1 100644
--- a/src/arcaea_offline_ocr/roi_extractor/sizes/common.py
+++ b/src/arcaea_offline_ocr/roi_extractor/sizes/common.py
@@ -3,7 +3,7 @@ from typing import Tuple
 Rect = Tuple[int, int, int, int]
 
 
-class Sizes:
+class DeviceRoiSizes:
     pure: Rect
     far: Rect
     lost: Rect