update raft optical flow

src/orisys/util.py

@@ -2,7 +2,7 @@ import cv2
 import numpy as np
 from scipy.interpolate import griddata
 
-def draw_arrows(image, optical_flow,fps=True, threshold=5, grid_spacing=40, arrow_scale=1.0):
+def draw_arrows(frame, optical_flow,fps=True, threshold=5, grid_spacing=40, arrow_scale=1.0):
     """
     Draw colored optical flow arrows on sensor image based on flow magnitude.
     
@@ -16,7 +16,7 @@ def draw_arrows(image, optical_flow,fps=True, threshold=5, grid_spacing=40, arro
     
     """
     # Create working copies to avoid modifying originals
-    
+    image = frame.copy()
     # Convert grayscale to BGR to enable colored arrow drawing
     if len(image.shape) == 2 or image.shape[2] == 1:
         image = cv2.cvtColor(image, cv2.COLOR_GRAY2BGR)