Fixed variable name in map size calculation

- accidentlally used cal_right_border instead of cal_bottom_border. Always pay attention to warnings of unused variables
- commented out unused code

src/df_tools/imgtools.py

@@ -2,8 +2,6 @@ import json
 import subprocess
 
 import pydantic as pyd
-import cv2
-import numpy as np
 
 from .dfwindow import DFWINDOW
 from .mylogging import logger, setup_logging
@@ -562,5 +560,5 @@ def test5():
 
 if __name__ == "__main__":
     setup_logging(level="DEBUG", enqueue=False, console_show_time=False, console_tracebacks=True)
-    
+
     test5()