fix: ensure src array is converted to float32 in estimate_floor_plane function

app.py

@@ -751,7 +751,7 @@ def estimate_floor_plane(mask: np.ndarray, img_np: np.ndarray):
         src[1][0] = max(src[1][0], hull_right_x)
         src[0][1] = src[1][1] = max(src[0][1], hull_bottom_y)
         src[2][1] = src[3][1] = min(src[2][1], hull_top_y)
-        src = np.clip(src, [0, 0], [w - 1, h - 1])
+        src = np.clip(src, [0, 0], [w - 1, h - 1]).astype(np.float32)
 
     if cv2.contourArea(src.reshape(-1, 1, 2)) < 100:
         return None, None