isaac_ros_detectnet

Source code on GitHub.

Quickstart

1. Set up your development environment by following the instructions here.

2. Clone isaac_ros_common and this repository under ${ISAAC_ROS_WS}/src.

   cd ${ISAAC_ROS_WS}/src
   

   git clone https://github.com/NVIDIA-ISAAC-ROS/isaac_ros_common.git
   

git clone https://github.com/NVIDIA-ISAAC-ROS/isaac_ros_object_detection.git

3. Pull down a ROS Bag of sample data:

   cd ${ISAAC_ROS_WS}/src/isaac_ros_object_detection/isaac_ros_detectnet && \
     git lfs pull -X "" -I "resources/rosbags"
   

4. Launch the Docker container using the run_dev.sh script:

   cd ${ISAAC_ROS_WS}/src/isaac_ros_common && \
     ./scripts/run_dev.sh
   

5. Install this package’s dependencies.

   sudo apt-get install -y ros-humble-isaac-ros-detectnet ros-humble-isaac-ros-triton ros-humble-isaac-ros-dnn-image-encoder
   

6. Run the quickstart setup script which will download the PeopleNet Model from NVIDIA GPU Cloud(NGC)

   cd /workspaces/isaac_ros-dev/src/isaac_ros_object_detection/isaac_ros_detectnet && \
     ./scripts/setup_model.sh --height 632 --width 1200 --config-file resources/quickstart_config.pbtxt
   

7. Run the following launch file to spin up a demo of this package:

   cd /workspaces/isaac_ros-dev && \
     ros2 launch isaac_ros_detectnet isaac_ros_detectnet_quickstart.launch.py
   

8. Visualize and validate the output of the package in the rqt_image_view window. After about a minute, your output should look like this:

   

Try More Examples

To continue your exploration, check out the following suggested examples:

• Tutorial with Isaac Sim
• Tutorial with Custom Model

This package only supports models based on the Detectnet_v2 architecture. Some of the supported DetectNet models from NGC:

Model Name	Use Case
PeopleNet AMR	People counting with a mobile robot
PeopleNet	People counting, heatmap generation, social distancing
TrafficCamNet	Detect and track cars
DashCamNet	Identify objects from a moving object
FaceDetectIR	Detect faces in a dark environment with IR camera

To learn how to use this models, click here.

ROS 2 Graph Configuration

To run the DetectNet object detection inference, the following ROS 2 nodes must be set up and running:

1. Isaac ROS DNN Image encoder: This takes an image message and converts it to a tensor (TensorList isaac_ros_tensor_list_interfaces/TensorList) that can be processed by the network.

2. Isaac ROS DNN Inference - Triton: This executes the DetectNet network and takes, as input, the tensor from the DNN Image Encoder.

   Note

   The Isaac ROS TensorRT package is not able to perform inference with DetectNet models at this time.

   The output is a TensorList message containing the encoded detections. Use the parameters model_name and model_repository_paths to point to the model folder and set the model name. The .plan file should be located at $model_repository_path/$model_name/1/model.plan

3. Isaac ROS Detectnet Decoder: This node takes the TensorList with encoded detections as input, and outputs Detection2DArray messages for each frame. See the following section for the parameters.

Troubleshooting

Isaac ROS Troubleshooting

For solutions to problems with Isaac ROS, see troubleshooting.

Deep Learning Troubleshooting

For solutions to problems with using DNN models, see troubleshooting deeplearning.

API

Usage

ros2 launch isaac_ros_detectnet isaac_ros_detectnet.launch.py label_list:=<list of labels> enable_confidence_threshold:=<enable confidence thresholding> enable_bbox_area_threshold:=<enable bbox size thresholding> enable_dbscan_clustering:=<enable dbscan clustering> confidence_threshold:=<minimum confidence value> min_bbox_area:=<minimum bbox area value> dbscan_confidence_threshold:=<minimum confidence for dbscan algorithm> dbscan_eps:=<epsilon distance> dbscan_min_boxes:=<minimum returned boxes> dbscan_enable_athr_filter:=<area-to-hit-ratio filter> dbscan_threshold_athr:=<area-to-hit ratio threshold> dbscan_clustering_algorithm:=<choice of clustering algorithm> bounding_box_scale:=<bounding box normalization value> bounding_box_offset:=<XY offset for bounding box>

ROS Parameters

ROS Parameter	Type	Default	Description
label_list	string[]	{"person", "bag", "face"}	The list of labels. These are loaded from labels.txt (downloaded with the model)
confidence_threshold	double	0.35	The min value of confidence used to threshold detections before clustering
min_bbox_area	double	100	The min value of bounding box area used to threshold detections before clustering
dbscan_confidence_threshold	double	0.35	Holds the epsilon to control merging of overlapping boxes. Refer to OpenCV groupRectangles and DBSCAN documentation for more information on epsilon.
dbscan_eps	double	0.7	Holds the epsilon to control merging of overlapping boxes. Refer to OpenCV groupRectangles and DBSCAN documentation for more information on epsilon.
dbscan_min_boxes	int	1	The minimum number of boxes to return.
dbscan_enable_athr_filter	int	0	Enables the area-to-hit ratio (ATHR) filter. The ATHR is calculated as: ATHR = sqrt(clusterArea) / nObjectsInCluster.
dbscan_threshold_athr	double	0.0	The area-to-hit ratio threshold.
dbscan_clustering_algorithm	int	1	The clustering algorithm selection. (1: Enables DBScan clustering, 2: Enables Hybrid clustering, resulting in more boxes that will need to be processed with NMS or other means of reducing overlapping detections.
bounding_box_scale	double	35.0	The scale parameter, which should match the training configuration.
bounding_box_offset	double	0.0	Bounding box offset for both X and Y dimensions.

ROS Topics Subscribed

ROS Topic	Interface	Description
tensor_sub	isaac_ros_tensor_list_interfaces/TensorList	The tensor that represents the inferred aligned bounding boxes.

ROS Topics Published

ROS Topic	Interface	Description
detectnet/detections	vision_msgs/Detection2DArray	Aligned image bounding boxes with detection class.