diff --git a/backend/main.py b/backend/main.py
index 5adb4ec..5cad54d 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -8,6 +8,7 @@ import sys
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 import config
+from backend.tools.common_tools import is_video_or_image, is_image_file
 from backend.scenedetect import scene_detect
 from backend.scenedetect.detectors import ContentDetector
 from backend.inpaint.sttn_inpaint import STTNInpaint, STTNVideoInpaint
@@ -183,7 +184,8 @@ class SubtitleDetect:
                 new_unify_values = []
 
                 for idx, region in enumerate(current_regions):
-                    last_standard_region = unify_value_map[last_key][idx] if idx < len(unify_value_map[last_key]) else None
+                    last_standard_region = unify_value_map[last_key][idx] if idx < len(
+                        unify_value_map[last_key]) else None
 
                     # 如果当前的区间与前一个键的对应区间相似，我们统一它们
                     if last_standard_region and self.are_similar(region, last_standard_region):
@@ -483,7 +485,7 @@ class SubtitleRemover:
         self.gui_mode = gui_mode
         # 判断是否为图片
         self.is_picture = False
-        if str(vd_path).endswith(('.bmp', '.dib', '.png', '.jpg', '.jpeg', '.pbm', '.pgm', '.ppm', '.tif', '.tiff')):
+        if is_image_file(str(vd_path)):
             self.sub_area = None
             self.is_picture = True
         # 视频路径
@@ -496,8 +498,10 @@ class SubtitleRemover:
         # 视频帧率
         self.fps = self.video_cap.get(cv2.CAP_PROP_FPS)
         # 视频尺寸
-        self.size = (int(self.video_cap.get(cv2.CAP_PROP_FRAME_WIDTH)), int(self.video_cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
-        self.mask_size = (int(self.video_cap.get(cv2.CAP_PROP_FRAME_HEIGHT)), int(self.video_cap.get(cv2.CAP_PROP_FRAME_WIDTH)))
+        self.size = (
+        int(self.video_cap.get(cv2.CAP_PROP_FRAME_WIDTH)), int(self.video_cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
+        self.mask_size = (
+        int(self.video_cap.get(cv2.CAP_PROP_FRAME_HEIGHT)), int(self.video_cap.get(cv2.CAP_PROP_FRAME_WIDTH)))
         self.frame_height = int(self.video_cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
         self.frame_width = int(self.video_cap.get(cv2.CAP_PROP_FRAME_WIDTH))
         # 创建字幕检测对象
@@ -671,7 +675,8 @@ class SubtitleRemover:
         if self.sub_area is not None:
             ymin, ymax, xmin, xmax = self.sub_area
         else:
-            print('[Info] No subtitle area has been set. Video will be processed in full screen. As a result, the final outcome might be suboptimal.')
+            print(
+                '[Info] No subtitle area has been set. Video will be processed in full screen. As a result, the final outcome might be suboptimal.')
             ymin, ymax, xmin, xmax = 0, self.frame_height, 0, self.frame_width
         mask_area_coordinates = [(xmin, xmax, ymin, ymax)]
         mask = create_mask(self.mask_size, mask_area_coordinates)
@@ -875,9 +880,13 @@ class SubtitleRemover:
 if __name__ == '__main__':
     multiprocessing.set_start_method("spawn")
     # 1. 提示用户输入视频路径
-    video_path = input(f"Please input video file path: ").strip()
+    video_path = input(f"Please input video or image file path: ").strip()
+    # 判断视频路径是不是一个目录，是目录的化，批量处理改目录下的所有视频文件
     # 2. 按以下顺序传入字幕区域
     # sub_area = (ymin, ymax, xmin, xmax)
     # 3. 新建字幕提取对象
-    sd = SubtitleRemover(video_path, sub_area=None)
-    sd.run()
+    if is_video_or_image(video_path):
+        sd = SubtitleRemover(video_path, sub_area=None)
+        sd.run()
+    else:
+        print(f'Invalid video path: {video_path}')
diff --git a/backend/tools/common_tools.py b/backend/tools/common_tools.py
new file mode 100644
index 0000000..54372d5
--- /dev/null
+++ b/backend/tools/common_tools.py
@@ -0,0 +1,32 @@
+import os
+
+video_extensions = {
+    '.mp4', '.m4a', '.m4v', '.f4v', '.f4a', '.m4b', '.m4r', '.f4b', '.mov',
+    '.3gp', '.3gp2', '.3g2', '.3gpp', '.3gpp2', '.ogg', '.oga', '.ogv', '.ogx',
+    '.wmv', '.wma', '.asf', '.webm', '.flv', '.avi', '.gifv', '.mkv', '.rm',
+    '.rmvb', '.vob', '.dvd', '.mpg', '.mpeg', '.mp2', '.mpe', '.mpv', '.mpg',
+    '.mpeg', '.m2v', '.svi', '.3gp', '.mxf', '.roq', '.nsv', '.flv', '.f4v',
+    '.f4p', '.f4a', '.f4b'
+}
+
+image_extensions = {
+    '.jpg', '.jpeg', '.jpe', '.jif', '.jfif', '.jfi', '.png', '.gif',
+    '.webp', '.tiff', '.tif', '.psd', '.raw', '.arw', '.cr2', '.nrw',
+    '.k25', '.bmp', '.dib', '.heif', '.heic', '.ind', '.indd', '.indt',
+    '.jp2', '.j2k', '.jpf', '.jpx', '.jpm', '.mj2', '.svg', '.svgz',
+    '.ai', '.eps', '.ico'
+}
+
+
+def is_video_file(filename):
+    return os.path.splitext(filename)[-1].lower() in video_extensions
+
+
+def is_image_file(filename):
+    return os.path.splitext(filename)[-1].lower() in image_extensions
+
+
+def is_video_or_image(filename):
+    file_extension = os.path.splitext(filename)[-1].lower()
+    # 检查扩展名是否在定义的视频或图片文件后缀集合中
+    return file_extension in video_extensions or file_extension in image_extensions