[Fix]: fix image conversion of Waymo to avoid information loss (#1979)

tools/dataset_converters/waymo_converter.py

@@ -12,7 +12,6 @@
 from glob import glob
 from os.path import join
 
-import mmcv
 import mmengine
 import numpy as np
 import tensorflow as tf
@@ -162,8 +161,8 @@ def save_image(self, frame, file_idx, frame_idx):
             img_path = f'{self.image_save_dir}{str(img.name - 1)}/' + \
                 f'{self.prefix}{str(file_idx).zfill(3)}' + \
                 f'{str(frame_idx).zfill(3)}.jpg'
-            img = mmcv.imfrombytes(img.image)
-            mmcv.imwrite(img, img_path)
+            with open(img_path, 'wb') as fp:
+                fp.write(img.image)
 
     def save_calib(self, frame, file_idx, frame_idx):
         """Parse and save the calibration data.