update example and coomputation dependency error handling

src/orisys/get_depth.py

@@ -19,7 +19,7 @@ class Contact3D:
         self.config_contact = config_contact
         self.flow_threshold = config_contact["flow_threshold"]
         self.expansion_threshold = config_contact["expansion_threshold"]
-        self.downsample_factor = config_contact["downsample_factor"]
+        self.downsample_factor = 1
         self.kernel_size = config_contact["kernel_size"]
         self.denoise_sigma = config_contact["denoise_sigma"]
         self.min_contour_area = config_contact["min_contour_area"]
@@ -75,7 +75,6 @@ class Contact3D:
         return result
     
     def compute_foe(self, flow_field, return_all_contours=False):
-    # def compute_foe(self, flow_field, min_magnitude=1.0, expansion_threshold=1, downsample_factor=1, return_all_contours=False, kernel_size=(5,5), denoise_sigma=10):
         """
         计算光流场的扩张焦点(Focus of Expansion)。