migrate depth_image_proc docs (#926)

.gitignore

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 *pyc
 .vscode/settings.json
+*/doc/generated

depth_image_proc/doc/changes.rst

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+Changelog Notes
+===============
+
+Jazzy Jalisco
+-------------
+There are several major change between ``Iron`` and ``Jazzy``:
+
+ * All components now properly support ``image_transport`` parameter, or
+   ``depth_image_transport`` if the topic is a depth image.
+ * All components now properly support remapping the ``camera_info`` topic
+   for an associated ``image`` topic. For instance, if you remap ``image``
+   to ``my/image`` then ``my/camera_info`` will be used. Previously you
+   would have to manually remap the ``camera_info`` topic.
+ * The input of ``point_cloud_xyz_radial`` is renamed from ``image_raw``
+   to ``depth/image_raw`` for consistency.
+ * The input of ``point_cloud_xyzrgb_radial`` is renamed from
+   ``depth_registered/image_rect`` to ``depth/image_raw`` and
+   ``rgb/image_rect_color`` to ``rgb/image_raw``.

depth_image_proc/doc/components.rst

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+Nodes and Components
+====================
+
+This package includes a number of ROS 2 components that can be assembled
+into depth image processing pipelines.
+See the tutorial :ref:`Launch depth_image_proc Components`.
+
+Alternatively, each component can be run as a standalone node.
+
+depth_image_proc::ConvertMetricNode
+-----------------------------------
+Component to convert raw uint16 depth image in millimeters to
+float depth image in meters.
+Also available as a standalone node with the name ``convert_metric_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **image_raw** (sensor_msgs/Image): ``uint16`` depth image in millimeters,
+   the native OpenNI format.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **image** (sensor_msgs/Image): ``float`` depth image in meters, the
+   recommended format for processing in ROS 2.
+
+Parameters
+^^^^^^^^^^
+ * **image_transport** (string, default: raw): Image transport to use.
+
+depth_image_proc::CropForemostNode
+----------------------------------
+Takes a depth image and crops the closest element. The node will find the
+minimum depth value in the image and then set all pixels farther than
+``min + distance`` to 0. Also available as a standalone node
+``crop_foremost_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **image_raw** (sensor_msgs/Image): Must be a depth (single channel) image.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **image** (sensor_msgs/Image): Cropped image.
+
+Parameters
+^^^^^^^^^^
+ * **distance** (float, default: 0.0): The depth tolerance to use when
+   thresholding the image. Pixels farther than ``min + distance`` will be
+   set to 0.
+ * **image_transport** (string, default: raw): Image transport to use.
+
+depth_image_proc::DisparityNode
+-------------------------------
+Converts a depth image to disparity image. Also available as a standalone
+node ``disparity_node``.
+The images below show the raw depth image, and the output disparity image.
+The output disparity image is being colorized using the ``disparity_view``
+node from the ``image_view`` package.
+
+|depth| |disparity|
+
+.. |depth| image:: images/depth.png
+   :width: 49%
+
+.. |disparity| image:: images/disparity.png
+   :width: 49%
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **left/image_rect** (sensor_msgs/Image): Rectified depth image.
+ * **right/camera_info** (sensor_msgs/CameraInfo): Camera calibration and
+   metadata. Must contain the baseline, which conventionally is encoded in
+   the right camera P matrix.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **left/disparity** (stereo_msgs/DisparityImage): Disparity image
+   (inversely related to depth), for interop with stereo processing nodes.
+   For all other purposes use depth images instead.
+
+Parameters
+^^^^^^^^^^
+ * **delta_d** (double, default: 0.125): Smallest allowed disparity increment,
+   which relates to the achievable depth range resolution. Defaults to 1/8 pixel.
+ * **image_transport** (string, default: raw): Image transport to use.
+ * **min_range** (double, default: 0.0): Minimum detectable distance.
+ * **max_range** (double, default: +Inf): Maximum detectable distance.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyzNode
+-----------------------------------
+Converts a depth image to XYZ point cloud. Also available as a standalone
+node ``point_cloud_xyz_node``.
+The images below show the raw depth image, and the output point cloud,
+colorized along the Z-axis.
+
+|depth| |cloud_xyz|
+
+.. |cloud_xyz| image:: images/rviz_xyz.png
+   :width: 49%
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **image_rect** (sensor_msgs/Image): Rectified depth image.
+ * **camera_info** (sensor_msgs/CameraInfo): Camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZ point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZ>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for the depth topic subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyzRadialNode
+-----------------------------------------
+Converts a radial depth image to an XYZ point cloud. Note that radial nodes
+assume an unrectified radial image, and therefore use the K and D matrices
+of the camera info message, rather than the P matrix. Also available as a
+standalone node ``point_cloud_xyz_radial_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth/image_raw** (sensor_msgs/Image): Unrectified radial depth image.
+ * **depth/camera_info** (sensor_msgs/CameraInfo): Camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZ point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZ>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for the depth topic subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyziNode
+------------------------------------
+Component to convert depth image to XYZI point cloud. Also available as a
+standalone node ``point_cloud_xyzi_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth/image_rect** (sensor_msgs/Image): Rectified depth image.
+ * **intensity/image_rect** (sensor_msgs/Image): Rectified intensity image.
+ * **intensity/camera_info** (sensor_msgs/CameraInfo): Camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZ point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZI>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for the depth topic subscriber.
+ * **image_transport** (string, default: raw): Image transport to use for
+   the intensity image subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyziRadialNode
+------------------------------------------
+Converts a radial depth image and an intensity image to an XYZI point cloud.
+Note that radial nodes assume an unrectified radial image, and therefore
+use the K and D matrices of the camera info message, rather than the P matrix.
+Also available as a standalone node ``point_cloud_xyzi_radial_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth/image_raw** (sensor_msgs/Image): Unrectified radial depth image.
+ * **intensity/image_raw** (sensor_msgs/Image): Unrectified intensity image.
+ * **intensity/camera_info** (sensor_msgs/CameraInfo): Camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZI point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZI>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for the depth topic subscriber.
+ * **image_transport** (string, default: raw): Image transport to use for
+   the intensity image subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyzrgbNode
+--------------------------------------
+Combines a registered depth image and an RGB image into XYZRGB point cloud.
+Also available as a standalone node ``point_cloud_xyzrgb_node``.
+
+|depth_reg| |rgb|
+
+.. |depth_reg| image:: images/depth_reg.png
+   :width: 49%
+
+.. |rgb| image:: images/rgb.jpg
+   :width: 49%
+
+The node can convert the registered depth and rgb images (above) into a colorized
+point cloud (below):
+
+|cloud_xyzrgb|
+
+.. |cloud_xyzrgb| image:: images/rviz_xyzrgb.png
+   :width: 60%
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth_registered/image_rect** (sensor_msgs/Image): Rectified depth image,
+   registered to the RGB camera
+ * **rgb/image_rect_color** (sensor_msgs/Image): Rectified color image.
+ * **rgb/camera_info** (sensor_msgs/CameraInfo): RGB camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZ point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZRGB>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for depth_registered subscriber.
+ * **image_transport** (string, default: raw): Image transport to use for
+   rgb/image_rect_color subscriber.
+ * **exact_sync** (bool, default: False): Whether to use exact synchronizer.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::PointCloudXyzrgbRadialNode
+--------------------------------------------
+Converts a radial depth image and an rgb image to an XYZRGB point cloud.
+Note that radial nodes assume an unrectified radial image, and therefore
+use the K and D matrices of the camera info message, rather than the P matrix.
+Also available as a standalone node ``point_cloud_xyzrgb_radial_node``.
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth/image_raw** (sensor_msgs/Image): Unrectified radial depth image.
+ * **rgb/image_raw** (sensor_msgs/Image): Unrectified rgb image.
+ * **rgb/camera_info** (sensor_msgs/CameraInfo): Camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **points** (sensor_msgs/PointCloud2): XYZRGB point cloud. If using PCL,
+   subscribe as PointCloud<PointXYZRGB>.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for the depth topic subscriber.
+ * **image_transport** (string, default: raw): Image transport to use for
+   the rgb image subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+depth_image_proc::RegisterNode
+------------------------------
+Component to "register" a depth image to another camera frame. Reprojecting the
+depths requires the calibration parameters of both cameras and, from tf, and the
+extrinsic transform between them. The images below show the depth image before
+and after apply registration:
+
+|depth| |depth_reg|
+
+Subscribed Topics
+^^^^^^^^^^^^^^^^^
+ * **depth/image_rect** (sensor_msgs/Image): Rectified depth image. The image should
+   be either 16UC1 (which is interpreted as millimeters) or 32FC1 (which is interpreted
+   as meters).
+ * **depth/camera_info** (sensor_msgs/CameraInfo): Depth camera calibration and metadata.
+ * **rgb/camera_info** (sensor_msgs/CameraInfo): RGB camera calibration and metadata.
+
+Published Topics
+^^^^^^^^^^^^^^^^
+ * **depth_registered/camera_info** (sensor_msgs/CameraInfo): Camera calibration and
+   metadata. Same as rgb/camera_info but time-synced to depth_registered/image_rect.
+ * **depth_registered/image_rect** (sensor_msgs/Image): Reprojected depth image in the
+   RGB camera frame.
+
+Parameters
+^^^^^^^^^^
+ * **depth_image_transport** (string, default: raw): Image transport to use
+   for depth subscriber.
+ * **queue_size** (int, default: 5): Size of message queue for synchronizing
+   subscribed topics.
+
+Required TF Transforms
+^^^^^^^^^^^^^^^^^^^^^^
+ * /depth_optical_frame → /rgb_optical_frame: The transform between the depth and
+   RGB camera optical frames as specified in the headers of the subscribed topics
+   (rendered here as /depth_optical_frame and /rgb_optical_frame).