fix bug

model.py

@@ -74,13 +74,12 @@ class TrafficSignDetector:
     
     def _preprocess(self, image):
         """
-        Preprocess image: normalize pixel values to [0, 1] range.
+        Preprocess image: keep uint8 format as YOLO expects.
         :param image: input image (numpy array, uint8)
-        :return: normalized image (float32)
+        :return: image in uint8 format
         """
-        # Normalize pixel values from [0, 255] to [0, 1]
-        image = image.astype(np.float32) / 255.0
-        print(f"Image normalized - Min: {image.min():.3f}, Max: {image.max():.3f}, Mean: {image.mean():.3f}")
+        # YOLO handles normalization internally, keep uint8 format
+        print(f"Image format: {image.dtype}, Min: {image.min()}, Max: {image.max()}, Mean: {image.mean():.1f}")
         return image
 
     def detect(self, image):