Add an option to subscribe compressed image topics

Also allow for relative names in cam_base_topic

aruco_opencv/config/aruco_tracker.yaml

@@ -5,6 +5,7 @@
 
     marker_dict: 4X4_50
 
+    image_sub_compressed: false
     image_sub_qos:
       reliability: 2 # 0 - system default, 1 - reliable, 2 - best effort
       durability: 2 # 0 - system default, 1 - transient local, 2 - volatile

aruco_opencv/package.xml

@@ -36,6 +36,7 @@
   <exec_depend>tf2_ros</exec_depend>
   <exec_depend>tf2_geometry_msgs</exec_depend>
   <exec_depend>yaml-cpp</exec_depend>
+  <exec_depend>compressed_image_transport</exec_depend>
 
   <test_depend>ament_lint_auto</test_depend>
   <test_depend>ament_cmake_copyright</test_depend>

aruco_opencv/src/aruco_tracker.cpp

@@ -60,6 +60,7 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
   bool transform_poses_;
   bool publish_tf_;
   double marker_size_;
+  bool image_sub_compressed_;
   int image_sub_qos_reliability_;
   int image_sub_qos_durability_;
   int image_sub_qos_depth_;
@@ -73,6 +74,7 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
   rclcpp_lifecycle::LifecyclePublisher<sensor_msgs::msg::Image>::SharedPtr debug_pub_;
   rclcpp::Subscription<sensor_msgs::msg::CameraInfo>::SharedPtr cam_info_sub_;
   rclcpp::Subscription<sensor_msgs::msg::Image>::SharedPtr img_sub_;
+  rclcpp::Subscription<sensor_msgs::msg::CompressedImage>::SharedPtr compressed_img_sub_;
   rclcpp::Time last_msg_stamp_;
   bool cam_info_retrieved_ = false;
 
@@ -159,6 +161,11 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
     cam_info_retrieved_ = false;
 
     std::string cam_info_topic = image_transport::getCameraInfoTopic(cam_base_topic_);
+    if (cam_base_topic_.size() > 0 && cam_base_topic_[0] != '/' && cam_info_topic.size() > 0 && cam_info_topic[0] == '/') {
+      // Remove leading slash to allow for relative camera_base_topic.
+      cam_info_topic = cam_info_topic.substr(1);
+    }
+
     cam_info_sub_ = create_subscription<sensor_msgs::msg::CameraInfo>(
       cam_info_topic, 1,
       std::bind(&ArucoTracker::callback_camera_info, this, std::placeholders::_1));
@@ -171,9 +178,15 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
 
     auto qos = rclcpp::QoS(rclcpp::QoSInitialization::from_rmw(image_sub_qos), image_sub_qos);
 
-    img_sub_ = create_subscription<sensor_msgs::msg::Image>(
-      cam_base_topic_, qos, std::bind(
-        &ArucoTracker::callback_image, this, std::placeholders::_1));
+    if (image_sub_compressed_) {
+      compressed_img_sub_ = create_subscription<sensor_msgs::msg::CompressedImage>(
+        cam_base_topic_ + "/compressed", qos, std::bind(
+          &ArucoTracker::callback_compressed_image, this, std::placeholders::_1));
+    } else {
+      img_sub_ = create_subscription<sensor_msgs::msg::Image>(
+        cam_base_topic_, qos, std::bind(
+          &ArucoTracker::callback_image, this, std::placeholders::_1));
+    }
 
     return LifecycleNodeInterface::CallbackReturn::SUCCESS;
   }
@@ -185,6 +198,7 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
     on_set_parameter_callback_handle_.reset();
     cam_info_sub_.reset();
     img_sub_.reset();
+    compressed_img_sub_.reset();
     tf_listener_.reset();
     tf_buffer_.reset();
 
@@ -231,6 +245,7 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
     declare_param(*this, "image_is_rectified", false, false);
     declare_param(*this, "output_frame", "");
     declare_param(*this, "marker_dict", "4X4_50");
+    declare_param(*this, "image_sub_compressed", false);
     declare_param(
       *this, "image_sub_qos.reliability",
       static_cast<int>(RMW_QOS_POLICY_RELIABILITY_BEST_EFFORT));
@@ -266,6 +281,8 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
 
     get_param(*this, "marker_dict", marker_dict_, "Marker Dictionary name: ");
 
+    get_parameter("image_sub_compressed", image_sub_compressed_);
+
     get_parameter("image_sub_qos.reliability", image_sub_qos_reliability_);
     get_parameter("image_sub_qos.durability", image_sub_qos_durability_);
     get_parameter("image_sub_qos.depth", image_sub_qos_depth_);
@@ -408,6 +425,13 @@ class ArucoTracker : public rclcpp_lifecycle::LifecycleNode
     }
   }
 
+  void callback_compressed_image(const sensor_msgs::msg::CompressedImage::ConstSharedPtr img_msg)
+  {
+    // Decompress the image using bridge
+    auto image = cv_bridge::toCvCopy(img_msg, "bgr8");
+    callback_image(image->toImageMsg());
+  }
+
   void callback_image(const sensor_msgs::msg::Image::ConstSharedPtr img_msg)
   {
     RCLCPP_DEBUG_STREAM(get_logger(), "Image message address [SUBSCRIBE]:\t" << img_msg.get());