PointcloudScreenpoint

What is this

Use pointcloud from kinect

Use pointcloud from laser

Use amplifiered pointclouds published by laser

This is a nodelet to convert (u, v) coordinate on a image to 3-D point. It retrieves 3-D environment as pointcloud.

pointcloud_screenpoint_sample.launch is a sample launch file.

Subscribing Topics

• ~points (sensor_msgs/PointCloud2):

  Pointcloud source to estimate 3D points that the user wantedt to specify on a 2D screen

• ~point (geometry_msgs/PointStamped):

  Input point to represent (u, v) image coordinate and this topic is enabled only if ~use_point parameter is set True. Only x and y fileds are used and the header frame_id is ignored. If ~use_sync parameter is set True, ~points and ~point are synchronized.

• ~rect (geometry_msgs/PolygonStamped):

  Input rectangular region on image local coordinates and this topic is enabled only if ~use_rect parameter is set True. Only x and y fields are used and the header frame_id is ignored. And the region should be rectangular. If ~use_sync parameter is set True,

• ~poly (geometry_msgs/PolygonStamped):`

  Input polygonal region in image local coordinates.

• ~point_array (sensor_msgs/PointCloud2):

  Input points to represent series of (u, v) image coordinate and this topic is enabled only if ~use_point_array parameter is set True. Only x and y fields are used and the header frame_id is ignored. If ~use_sync parameter is set True, ~point_array and ~point are synchronized.

Publishing Topics

• ~output_point (geometry_msgs/PointStamped):

  The topic to be used to publish one point as a result of screenpoint.

• ~output (sensor_msgs/PointCloud):

  The topic to be used to publish series of points as a result of screenpoint.

• ~output_polygon (geometry_msgs/PolygonStamped):

  Projected points of ~rect or ~poly.

Advertising Servicies

• ~screen_to_point (jsk_pcl_ros::TransformScreenpoint):

  ROS Service interface to convert (u, v) image coordinate into 3-D point.

  The definition of jsk_pcl_ros::TransformScreenpoint is:

# screen point
float32 x
float32 y
---
# position in actual world
std_msgs/Header header
geometry_msgs/Point point
geometry_msgs/Vector3 vector

With int this service, the latest pointcloud acquired by ~points is used to convert (u, v) into 3-D point.

Parameters

• ~use_sync (Boolean, default: False):

  If this parameter is set to True, the timestamps of 3-D pointcloud and the target point/rectangle/point array are synchronized.

• ~queue_size (Integer, default: 1):

  Queue length of subscribing topics.

• ~crop_size (Integer, default: 10):

  The size of approximate region if ~points pointcloud has nan holes.

• ~use_rect (Boolean, default: False):

  Enable ~polygon topic.

• ~use_poly (Boolean, default: False):

  Enable ~poly topic.

• ~use_point (Boolean, default: False):

  Enable ~point topic.

• ~use_point_array (Boolean, default: False):

  Enable ~point_array topic.

• ~publish_points (Boolean, default: False):

  Publish result of screenpoint to ~output topic.

• ~publish_point (Boolean, default: False):

  Publish result of screenpoint to ~output_point topic.