improve readme.md and configs util functions

src/orisys/sensor.py

@@ -21,7 +21,6 @@ from .nHHD import nHHD
 from . import configs 
 from .get_depth import Contact3D
 
-
 class Sensor:
     """
     Optical tactile sensor interface with deformation analysis.
@@ -200,7 +199,7 @@ class Sensor:
         if self.mirror:
             self.__img = cv2.flip(self.__img, 1)
             
-        return True
+        return self.__img.copy()
 
     def compute_deformation(self):
         """
@@ -228,7 +227,6 @@ class Sensor:
         if hasattr(flow, 'download'):
             flow = flow.download()
         self.__flow = flow
-        return True
     
     def __compute_hhd(self):
 
@@ -358,12 +356,14 @@ class Sensor:
     # Public API - Configuration & Calibration
     # =========================================================================
     
-    def export_config(self, path="./config/exported_config.json"):
-        """Return current configuration dict."""
-        configs.export_config(self._config, path)
-        if self.verbose:
-            print(f"Config exported to {path}")
-        return True
+    # def export_config(self, path="./config/exported_config.json"):
+    #     """Return current configuration dict."""
+    #     configs.export_config(self._config, path)
+    #     if self.verbose:
+    #         print(f"Config exported to {path}")
+    #     return True
+
+
 
     def stitch_cal(self):
         """