isaac_ros_image_proc

Source code available on GitHub.

Quickstart

Set Up Development Environment

1. Set up your development environment by following the instructions in getting started.

2. (Optional) Install dependencies for any sensors you want to use by following the sensor-specific guides.

   Note

   We strongly recommend installing all sensor dependencies before starting any quickstarts. Some sensor dependencies require restarting the development environment during installation, which will interrupt the quickstart process.

Datasets

Download Quickstart Assets

1. Download quickstart data from NGC:

   Make sure required libraries are installed.

   sudo apt-get install -y curl jq tar
   

   Then, run these commands to download the asset from NGC:

   NGC_ORG="nvidia"
   NGC_TEAM="isaac"
   PACKAGE_NAME="isaac_ros_image_proc"
   NGC_RESOURCE="isaac_ros_image_proc_assets"
   NGC_FILENAME="quickstart.tar.gz"
   MAJOR_VERSION=4
   MINOR_VERSION=0
   VERSION_REQ_URL="https://catalog.ngc.nvidia.com/api/resources/versions?orgName=$NGC_ORG&teamName=$NGC_TEAM&name=$NGC_RESOURCE&isPublic=true&pageNumber=0&pageSize=100&sortOrder=CREATED_DATE_DESC"
   AVAILABLE_VERSIONS=$(curl -s \
       -H "Accept: application/json" "$VERSION_REQ_URL")
   LATEST_VERSION_ID=$(echo $AVAILABLE_VERSIONS | jq -r "
       .recipeVersions[]
       | .versionId as \$v
       | \$v | select(test(\"^\\\\d+\\\\.\\\\d+\\\\.\\\\d+$\"))
       | split(\".\") | {major: .[0]|tonumber, minor: .[1]|tonumber, patch: .[2]|tonumber}
       | select(.major == $MAJOR_VERSION and .minor <= $MINOR_VERSION)
       | \$v
       " | sort -V | tail -n 1
   )
   if [ -z "$LATEST_VERSION_ID" ]; then
       echo "No corresponding version found for Isaac ROS $MAJOR_VERSION.$MINOR_VERSION"
       echo "Found versions:"
       echo $AVAILABLE_VERSIONS | jq -r '.recipeVersions[].versionId'
   else
       mkdir -p ${ISAAC_ROS_WS}/isaac_ros_assets && \
       FILE_REQ_URL="https://api.ngc.nvidia.com/v2/resources/$NGC_ORG/$NGC_TEAM/$NGC_RESOURCE/\
   versions/$LATEST_VERSION_ID/files/$NGC_FILENAME" && \
       curl -LO --request GET "${FILE_REQ_URL}" && \
       tar -xf ${NGC_FILENAME} -C ${ISAAC_ROS_WS}/isaac_ros_assets && \
       rm ${NGC_FILENAME}
   fi
   

Build isaac_ros_image_proc

Binary PackageBuild from Source

1. Activate the Isaac ROS environment:

   isaac-ros activate
   

2. Install the prebuilt Debian package:

   sudo apt-get update
   

   sudo apt-get install -y ros-jazzy-isaac-ros-image-proc
   

Run Launch File

Note

The quickstart for the alpha blending node has been integrated into isaac_ros_unet image segmentation. To run and visualize the results of alpha blending, see here.

RosbagRealSense CameraZED Camera

1. Continuing inside the Isaac ROS environment, install the following dependencies:

   sudo apt-get update
   

   sudo apt-get install -y ros-jazzy-isaac-ros-examples
   

2. Run the following launch file to spin up a demo of this package using the quickstart rosbag:

   Resize:

   ros2 launch isaac_ros_examples isaac_ros_examples.launch.py launch_fragments:=resize
   

   Color Conversion:

   ros2 launch isaac_ros_examples isaac_ros_examples.launch.py launch_fragments:=color_conversion interface_specs_file:=${ISAAC_ROS_WS}/isaac_ros_assets/isaac_ros_image_proc/quickstart_interface_specs.json
   

   Crop:

   ros2 launch isaac_ros_examples isaac_ros_examples.launch.py launch_fragments:=crop interface_specs_file:=${ISAAC_ROS_WS}/isaac_ros_assets/isaac_ros_image_proc/quickstart_interface_specs.json
   

   Rectify:

   ros2 launch isaac_ros_examples isaac_ros_examples.launch.py launch_fragments:=rectify_mono interface_specs_file:=${ISAAC_ROS_WS}/isaac_ros_assets/isaac_ros_image_proc/quickstart_interface_specs.json
   

   Flip:

   ros2 launch isaac_ros_examples isaac_ros_examples.launch.py launch_fragments:=flip
   

3. Open a second terminal inside the Isaac ROS environment:

   isaac-ros activate
   

4. Run the rosbag file to simulate an image stream:

   ros2 bag play --loop ${ISAAC_ROS_WS}/isaac_ros_assets/isaac_ros_image_proc/quickstart --remap /hawk_0_left_rgb_image:=/image_raw /hawk_0_left_rgb_camera_info:=/camera_info
   

Visualize Results

1. Open a new terminal inside the Isaac ROS environment:

   isaac-ros activate
   

2. Observe the image_proc output on the terminal with the command:

   Resize:

   ros2 run image_view image_view --ros-args --remap image:=resize/image
   

   Color Conversion:

   ros2 run image_view image_view --ros-args --remap image:=image_mono
   

   Crop:

   ros2 run image_view image_view --ros-args --remap image:=crop/image
   

   Rectify:

   ros2 run image_view image_view --ros-args --remap image:=image_rect
   

   Flip:

   ros2 run image_view image_view --ros-args --remap image:=image_flipped
   

Overview

The isaac_ros_image_proc package offers functionality for rectifying/undistorting images from a monocular camera setup, resizing the image, changing the image format, and alpha blending two images. It largely replaces the image_proc package, though the image format conversion facility also functions as a way to replace the CPU-based image format conversion in cv_bridge. The rectify node can also resize the image; if resizing is not needed, specify the output width/height same as input.

Available Components

AlphaBlendNode

ROS Parameters

ROS Parameter	Type	Default	Description
alpha	double	0.5	The alpha value, where 0 represents the image input being fully transparent and the mask input fully opaque. This is a mandatory parameter and needs to be between 0 and 1 inclusive.
image_queue_size	int	10	The queue size of the image input. This is a mandatory parameter and needs to be set to a non-zero positive number.
mask_queue_size	int	10	The queue size of the mask input. This is a mandatory parameter and needs to be set to a non-zero positive number.
sync_queue_size	int	10	The queue size of the time synchronizer. This is a mandatory parameter and needs to be set to a non-zero positive number.

ROS Topics Subscribed

ROS Topic	Interface	Description
image_input	NitrosImage	The input image to blend.
mask_input	NitrosImage	The mask image to blend.

ROS Topics Published

ROS Topic	Interface	Description
blended_image	NitrosImage	Blended image.

CropNode

ROS Parameters

ROS Parameter	Type	Default	Description
input_width	int64_t	0	The width of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
input_height	int64_t	0	The height of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
crop_width	int64_t	0	The width of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
crop_height	int64_t	0	The height of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
crop_mode	string	""	Mode of operation to perform cropping. Valid values are - CENTER, LEFT, RIGHT, TOP, BOTTOM, TOPLEFT, TOPRIGHT, BOTTOMLEFT, BOTTOMRIGHT, and BBOX. Except BBOX, region of interest calculation is performed based on input and cropped image dimensions.
roi_top_left_x	int64_t	0	X value of the top left corner of a region of interest. This is only used when crop_mode is set to BBOX.
roi_top_left_y	int64_t	0	Y value of the top left corner of a region of interest. This is only used when crop_mode is set to BBOX.
num_blocks	int	40	The number of pre-allocated memory output blocks, should not be less than 40.

ROS Topics Subscribed

ROS Topic	Interface	Description
image	NitrosImage	The input image that needs to be cropped.
camera_info	NitrosCameraInfo	The corresponding camera_info of the input image.

ROS Topics Published

ROS Topic	Interface	Description
crop/image	NitrosImage	Cropped image.
crop/camera_info	NitrosCameraInfo	The corresponding camera_info of the cropped image.

ImageFlipNode

ROS Parameters

ROS Parameter	Type	Default	Description
flip_mode	string	BOTH	Axis to be use for flip operation. Valid values are - HORIZONTAL, VERTICAL, and BOTH.

ROS Topics Subscribed

ROS Topic	Interface	Description
image	NitrosImage	The input image that needs to be flipped.

ROS Topics Published

ROS Topic	Interface	Description
image_flipped	NitrosImage	Flipped image.

ImageFormatConverterNode

ROS Parameters

ROS Parameter	Type	Default	Description
image_width	int64_t	1280	The width of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
image_height	int64_t	720	The height of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
encoding_desired	string	""	Target color encoding to convert to. Valid values are - img_encodings::RGB8, img_encodings::RGB16, img_encodings::BGR8, img_encodings::BGR16, img_encodings::MONO8, img_encodings::MONO16, img_encodings::NV24, and nv12.
num_blocks	int	40	The number of pre-allocated memory output blocks, should not be less than 40.

ROS Topics Subscribed

ROS Topic	Interface	Description
image_raw	NitrosImage	The input image data.

ROS Topics Published

ROS Topic	Interface	Description
image	NitrosImage	The output image data.

ImageNormalizeNode

ROS Parameters

ROS Parameter	Type	Default	Description
mean	std::vector<double>	{0.5, 0.5, 0.5}	The mean of the image pixels per channel that will be used for normalization.
stddev	std::vector<double>	{0.5, 0.5, 0.5}	The standard deviation of the image pixels per channel that will be used for normalization.

ROS Topics Subscribed

ROS Topic	Interface	Description
image	NitrosImage	The input image data.

ROS Topics Published

ROS Topic	Interface	Description
normalized_image	NitrosImage	The output image data.

PadNode

ROS Parameters

ROS Parameter	Type	Default	Description
output_image_width	uint16_t	1200	The width of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
output_image_height	uint16_t	1024	The height of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
padding_type	string	CENTER	Describes the padding mode. Valid values are - CENTER, TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, and BOTTOM_RIGHT.
border_type	string	CONSTANT	Describes how border values are calculated. Valid values are - CONSTANT, REPLICATE, REFLECT, WRAP, and REFLECT101. More info can be found here.
border_pixel_color_value	std::vector<double>	{0.0, 0.0, 0.0, 0.0}	RGBA color value for border color.

ROS Topics Subscribed

ROS Topic	Interface	Description
image	NitrosImage	The input image data.

ROS Topics Published

ROS Topic	Interface	Description
padded_image	NitrosImage	The output image data.

RectifyNode

ROS Parameters

ROS Parameter	Type	Default	Description
output_width	uint16_t	1200	The width of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
output_height	uint16_t	1024	The height of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
horizontal_interval	uint16_t	1	The horizontal interval used for generating rectify warp grid points. It must be power-of-two and must be greater than or equal to 1.
vertical_interval	uint16_t	1	The vertical interval used for generating rectify warp grid points. It must be power-of-two and must be greater than or equal to 1.
interpolation	string	cubic_catmullrom	The interpolation type. Choices are: nearest, linear, cubic_catmullrom.
border_type	string	zero	The boarder type specifies how the pixel values outside of the image should be constructed. Choices are: zero, repeat, reverse, mirror.
num_blocks	int	40	The number of pre-allocated memory output blocks, should not be less than 40.

ROS Topics Subscribed

ROS Topic	Interface	Description
image_raw	NitrosImage	The input image that needs to be rectified.
camera_info	NitrosCameraInfo	The corresponding camera_info of the input image.

ROS Topics Published

ROS Topic	Interface	Description
image_rect	NitrosImage	Rectified image.
camera_info_rect	NitrosCameraInfo	The corresponding camera_info of the rectified image.

ResizeNode

ROS Parameters

ROS Parameter	Type	Default	Description
input_width	int64_t	0	The width of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
input_height	int64_t	0	The height of the input image. This is a mandatory parameter and needs to be set to a non-zero positive number.
output_width	int64_t	1080	The width of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
output_height	int64_t	720	The height of the output image. This is a mandatory parameter and needs to be set to a non-zero positive number.
keep_aspect_ratio	bool	false	When enabled, aspect ratio of the original image will be preserved by adding black border.
encoding_desired	string	""	This value is used to mark the preference of output color format.
disable_padding	bool	false	When set to true, keep_aspect_ratio is ignored and no padding is added to the output image.
num_blocks	int	40	The number of pre-allocated memory output blocks, should not be less than 40.

ROS Topics Subscribed

ROS Topic	Interface	Description
image	NitrosImage	The input image that needs to be resized.
camera_info	NitrosCameraInfo	The corresponding camera_info of the input image.

ROS Topics Published

ROS Topic	Interface	Description
resize/image	NitrosImage	Resized image.
resize/camera_info	NitrosCameraInfo	The corresponding camera_info of the resized image.

Limitation: isaac_ros_image_proc nodes require even number dimensions for images.