Implemented dummy face detection and intergrated it with BiteInitiation

- implemented and tested the dummy ROS2 node
- integrated it with the web app
- implemented proper use of useRef and useCallback
- Added a debug continue button (e.g., if ROS is not running)
- added ability to unsubscribe from a topic

Author: amalnanavati

feeding_web_app_ros2_test/feeding_web_app_ros2_test/FaceDetection.py

@@ -0,0 +1,185 @@
+#!/usr/bin/env python3
+from ada_feeding_msgs.msg import FaceDetection
+from ada_feeding_msgs.srv import ToggleFaceDetection
+import cv2
+from cv_bridge import CvBridge
+from geometry_msgs.msg import PointStamped
+import rclpy
+from rclpy.node import Node
+from sensor_msgs.msg import Image
+from threading import Lock
+
+
+class FaceDetectionNode(Node):
+    def __init__(
+        self,
+        face_detection_interval=150,
+        num_images_with_face=60,
+        open_mouth_interval=90,
+        num_images_with_open_mouth=30,
+    ):
+        """
+        Initializes the FaceDetection node, which exposes a ToggleFaceDetection
+        service that can be used to toggle the face detection on or off and
+        publishes information about detected faces to the /face_detection
+        topic when face detection is on.
+
+        After face_detection_interval images without a face, this dummy function
+        detects a face for num_images_with_face frames. After open_mouth_interval
+        images with a face but without an open mouth, this dummy function
+        detects an open mouth for num_images_with_open_mouth frames.
+
+        Parameters:
+        ----------
+        face_detection_interval: The number of frames between each face detection.
+        num_images_with_face: The number of frames that must have a face in them.
+        open_mouth_interval: The number of frames between each open mouth detection.
+        num_images_with_open_mouth: The number of frames that must have an open mouth in them.
+        """
+        super().__init__("face_detection")
+
+        # Internal variables to track when a face and/or open mouth should be detected
+        self.face_detection_interval = face_detection_interval
+        self.num_images_with_face = num_images_with_face
+        self.open_mouth_interval = open_mouth_interval
+        self.num_images_with_open_mouth = num_images_with_open_mouth
+        self.num_consecutive_images_without_face = 0
+        self.num_consecutive_images_with_face = 0
+        self.num_consecutive_images_without_open_mouth = 0
+        self.num_consecutive_images_with_open_mouth = 0
+
+        # Convert between ROS and CV images
+        self.bridge = CvBridge()
+
+        # Keeps track of whether face detection is on or not
+        self.is_on = False
+        self.is_on_lock = Lock()
+
+        # Create the service
+        self.srv = self.create_service(
+            ToggleFaceDetection,
+            "ToggleFaceDetection",
+            self.toggle_face_detection_callback,
+        )
+
+        # Subscribe to the camera feed
+        self.subscription = self.create_subscription(
+            Image, "camera/color/image_raw", self.camera_callback, 1
+        )
+        self.subscription  # prevent unused variable warning
+
+        # Create the publishers
+        self.publisher_results = self.create_publisher(
+            FaceDetection, "face_detection", 1
+        )
+        self.publisher_image = self.create_publisher(Image, "face_detection_img", 1)
+
+    def toggle_face_detection_callback(self, request, response):
+        """
+        Callback function for the ToggleFaceDetection service. Safely toggles
+        the face detection on or off depending on the request.
+        """
+        self.get_logger().info(
+            "Incoming service request. turn_on: %s" % (request.turn_on)
+        )
+        if request.turn_on:
+            # Reset counters
+            self.num_consecutive_images_without_face = 0
+            self.num_consecutive_images_with_face = 0
+            self.num_consecutive_images_without_open_mouth = 0
+            self.num_consecutive_images_with_open_mouth = 0
+            # Turn on face detection
+            self.is_on_lock.acquire()
+            self.is_on = True
+            self.is_on_lock.release()
+            response.face_detection_is_on = True
+        else:
+            self.is_on_lock.acquire()
+            self.is_on = False
+            self.is_on_lock.release()
+            response.face_detection_is_on = False
+        return response
+
+    def camera_callback(self, msg):
+        """
+        Callback function for the camera feed. If face detection is on, this
+        function will detect faces in the image and publish information about
+        them to the /face_detection topic.
+        """
+        self.is_on_lock.acquire()
+        is_on = self.is_on
+        self.is_on_lock.release()
+        if is_on:
+            # Update the number of consecutive images with/without a face
+            is_face_detected = False
+            if self.num_consecutive_images_with_face == self.num_images_with_face:
+                self.num_consecutive_images_without_face = 0
+                self.num_consecutive_images_with_face = 0
+            if self.num_consecutive_images_without_face == self.face_detection_interval:
+                # Detect a face
+                self.num_consecutive_images_with_face += 1
+                is_face_detected = True
+            else:
+                # Don't detect a face
+                self.num_consecutive_images_without_face += 1
+
+            # Update the number of consecutive images with/without an open mouth
+            open_mouth_detected = False
+            if is_face_detected:
+                if (
+                    self.num_consecutive_images_with_open_mouth
+                    == self.num_images_with_open_mouth
+                ):
+                    self.num_consecutive_images_without_open_mouth = 0
+                    self.num_consecutive_images_with_open_mouth = 0
+                if (
+                    self.num_consecutive_images_without_open_mouth
+                    == self.open_mouth_interval
+                ):
+                    # Detect an open mouth
+                    self.num_consecutive_images_with_open_mouth += 1
+                    open_mouth_detected = True
+                else:
+                    # Don't detect an open mouth
+                    self.num_consecutive_images_without_open_mouth += 1
+
+            # Publish the face detection information
+            face_detection_msg = FaceDetection()
+            face_detection_msg.is_face_detected = is_face_detected
+            if is_face_detected:
+                # Add a dummy face marker to the sensor_msgs/Image
+                cv_image = self.bridge.imgmsg_to_cv2(msg, "bgr8")
+                cv2.circle(
+                    cv_image,
+                    (msg.width // 2, msg.height // 2),
+                    msg.height // 25,
+                    (0, 0, 255),
+                    -1,
+                )
+                annotated_msg = self.bridge.cv2_to_imgmsg(cv_image, "bgr8")
+                annotated_img = annotated_msg
+                # Publish the detected mouth center
+                face_detection_msg.detected_mouth_center = PointStamped()
+                face_detection_msg.detected_mouth_center.header = msg.header
+                face_detection_msg.detected_mouth_center.point.x = msg.width / 2.0
+                face_detection_msg.detected_mouth_center.point.y = msg.height / 2.0
+                face_detection_msg.detected_mouth_center.point.z = 0.0
+            else:
+                annotated_img = msg
+            face_detection_msg.is_mouth_open = open_mouth_detected
+            self.publisher_results.publish(face_detection_msg)
+            self.publisher_image.publish(annotated_img)
+
+
+def main(args=None):
+    rclpy.init(args=args)
+
+    face_detection = FaceDetectionNode()
+
+    rclpy.spin(face_detection)
+
+    rclpy.shutdown()
+
+
+if __name__ == "__main__":
+    main()

feeding_web_app_ros2_test/feeding_web_app_ros2_test/reverse_string_service.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-from feeding_web_app_ros2_msgs.srv import ReverseString  # CHANGE
+from feeding_web_app_ros2_msgs.srv import ReverseString
 
 import rclpy
 from rclpy.node import Node

feeding_web_app_ros2_test/launch/feeding_web_app_dummy_nodes_launch.xml

@@ -8,6 +8,8 @@
 
   <!-- The RealSense Node -->
   <node pkg="feeding_web_app_ros2_test" exec="DummyRealSense" name="DummyRealSense"/>
+  <!-- The FaceDetection node -->
+  <node pkg="feeding_web_app_ros2_test" exec="FaceDetection" name="FaceDetection"/>
   <!-- The MoveAbovePlate action -->
   <node pkg="feeding_web_app_ros2_test" exec="MoveAbovePlate" name="MoveAbovePlate"/>
 </launch>

feeding_web_app_ros2_test/package.xml

@@ -11,6 +11,7 @@
   <test_depend>ament_flake8</test_depend>
   <test_depend>ament_pep257</test_depend>
   <test_depend>python3-pytest</test_depend>
+  <exec_depend>ada_feeding_msgs</exec_depend>
   <exec_depend>feeding_web_app_ros2_msgs</exec_depend>
   <exec_depend>cv_bridge</exec_depend>
   <exec_depend>rclpy</exec_depend>

feeding_web_app_ros2_test/setup.py

@@ -33,6 +33,7 @@
         "console_scripts": [
             # Scripts for the main app
             "DummyRealSense = feeding_web_app_ros2_test.DummyRealSense:main",
+            "FaceDetection = feeding_web_app_ros2_test.FaceDetection:main",
             "MoveAbovePlate = feeding_web_app_ros2_test.MoveAbovePlate:main",
             # Scripts for the "TestROS" component
             "listener = feeding_web_app_ros2_test.subscriber:main",

feedingwebapp/src/Pages/Constants.js

@@ -23,8 +23,11 @@ FOOTER_STATE_ICON_DICT[MEAL_STATE.R_MovingToMouth] = '/robot_state_imgs/move_to_
 FOOTER_STATE_ICON_DICT[MEAL_STATE.R_StowingArm] = '/robot_state_imgs/stowing_arm_position.svg'
 export { FOOTER_STATE_ICON_DICT }
 
-// The names of the camera feed ROS topic(s)
+// The names of the ROS topic(s)
 export const CAMERA_FEED_TOPIC = '/camera/color/image_raw'
+export const FACE_DETECTION_TOPIC = '/face_detection'
+export const FACE_DETECTION_TOPIC_MSG = 'ada_feeding_msgs/FaceDetection'
+export const FACE_DETECTION_IMG_TOPIC = '/face_detection_img'
 
 // For states that call ROS actions, this dictionary contains
 // the action name and the message type
@@ -35,6 +38,15 @@ ROS_ACTIONS_NAMES[MEAL_STATE.R_MovingAbovePlate] = {
 }
 export { ROS_ACTIONS_NAMES }
 
+// For states that call ROS services, this dictionary contains
+// the service name and the message type
+let ROS_SERVICE_NAMES = {}
+ROS_SERVICE_NAMES[MEAL_STATE.U_BiteInitiation] = {
+  serviceName: 'ToggleFaceDetection',
+  messageType: 'ada_feeding_msgs/srv/ToggleFaceDetection'
+}
+export { ROS_SERVICE_NAMES }
+
 // The meaning of the status that motion actions return in their results.
 // These should match the action definition(s)
 export const MOTION_STATUS_SUCCESS = 0

feedingwebapp/src/Pages/GlobalState.jsx

@@ -92,6 +92,7 @@ export const useGlobalState = create(
       mealStateTransitionTime: Date.now(),
       appPage: APP_PAGE.Home,
       desiredFoodItem: null,
+      detectedMouthCenter: null,
       // Settings values
       stagingPosition: SETTINGS.stagingPosition[0],
       biteInitiation: SETTINGS.biteInitiation[0],
@@ -111,6 +112,10 @@ export const useGlobalState = create(
         set(() => ({
           desiredFoodItem: desiredFoodItem
         })),
+      setDetectedMouthCenter: (detectedMouthCenter) =>
+        set(() => ({
+          detectedMouthCenter: detectedMouthCenter
+        })),
       setStagingPosition: (stagingPosition) =>
         set(() => ({
           stagingPosition: stagingPosition