首先看一下教程：

http://wiki.ros.org/openni_launch/Tutorials/BagRecordingPlayback

知道了rosbag如何进行使用记录深度数据

但是按照以上教程记录下来的bag file还是很大

于是看了别人写的launch file

摘抄自spencer_people_tracking

<!-- Launch file for playing bagfiles recorded with the SPENCER robot platform -->

<launch>

  <!-- CONFIGURABLE ARGUMENTS -->

  <arg name="files" default=""/>

  <arg name="folder" default=""/>

  <arg name="urdf" default="false"/>

  <arg name="remap_tf" default="true" if="$(arg urdf)"/>

  <arg name="remap_tf" default="false" unless="$(arg urdf)"/>

  <arg name="depth" default="true"/>

  <arg name="no_point_clouds" default="false" />

  <arg name="front_rgbd" default="true"/>

  <arg name="rear_rgbd" default="true"/>

  <arg name="laser" default="true"/>

  <arg name="uncompress_rgbd" default="true"/>

  <arg name="tracked_persons" default="true"/>

  <arg name="velodyne" default="false"/>

  <!-- Playback options -->

  <arg name="rqt" default="false"/>

  <arg name="pause" default="true"/>

  <arg name="initial_wait_time" default="0.0" if="$(arg pause)"/>

  <arg name="initial_wait_time" default="45.0" unless="$(arg pause)"/>

  <arg name="loop" default="false"/>

  <arg name="start" default="0.0"/> <!-- seconds into the bagfile at which to start playing -->

  <arg name="duration" default="99999999.9"/> <!-- number of seconds to play -->

  <arg name="rate" default="1.0"/> <!-- playback speed -->

  <arg name="required" default="true" />

  <!-- Visualization options -->

  <arg name="visualization" default="true" /> <!-- whether to run RViz with provided config, or not -->

  <arg name="panoramas" default="false"/>

  <arg name="relay_rgbd_for_visualization" default="true"/>

  <arg name="rviz_config_file" default="$(find spencer_bagfile_tools)/launch/components/visualization_robot.rviz"/> <!-- configuration file for RViz to use, if visualization is enabled -->

  <arg name="rosbag_play_args" default="--clock --queue=5 --delay=0 --start=$(arg start) --duration=$(arg duration) --rate=$(arg rate)" /> <!-- extra arguments used to play back the bagfile -->

  <!-- Important: Use simulated time published on /clock topic, otherwise TF will be broken -->

  <param name="/use_sim_time" value="true"/>

  <!-- BAG FILE PLAYBACK -->

  <group>

    <remap from="/tf" to="/spencer/sensors/tf_in_bagfile" if="$(arg remap_tf)"/>

    <remap from="/spencer/sensors/clock" to="/clock"/>

    <remap from="/spencer/perception/tracked_persons" to="/spencer/perception/tracked_persons_in_bagfile" unless="$(arg tracked_persons)"/>

    <remap from="/spencer/perception/detected_persons" to="/spencer/perception/detected_persons_in_bagfile" unless="$(arg tracked_persons)"/>

    <!-- Uncompress RGB-D images -->

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_top/depth/image_raw/compressedDepth" to="/spencer/sensors/rgbd_front_top/depth_recorded/image_raw/compressedDepth"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_top/rgb/image_raw/compressed"    to="/spencer/sensors/rgbd_front_top/rgb_recorded/image_color/compressed"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_bottom/depth/image_raw/compressedDepth" to="/spencer/sensors/rgbd_front_bottom/depth_recorded/image_raw/compressedDepth"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_bottom/rgb/image_raw/compressed"    to="/spencer/sensors/rgbd_front_bottom/rgb_recorded/image_color/compressed"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_top/depth/image_raw/compressedDepth" to="/spencer/sensors/rgbd_rear_top/depth_recorded/image_raw/compressedDepth"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_top/rgb/image_raw/compressed"    to="/spencer/sensors/rgbd_rear_top/rgb_recorded/image_color/compressed"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_bottom/depth/image_raw/compressedDepth" to="/spencer/sensors/rgbd_rear_bottom/depth_recorded/image_raw/compressedDepth"/>

    <remap if="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_bottom/rgb/image_raw/compressed"    to="/spencer/sensors/rgbd_rear_bottom/rgb_recorded/image_color/compressed"/>

    <!-- Hack if uncompressed depth/image_rect was recorded instead of depth/image_raw as recommended at http://wiki.ros.org/openni_launch/Tutorials/BagRecordingPlayback -->

    <remap unless="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_top/depth/image_rect" to="/spencer/sensors/rgbd_front_top/depth/image_raw"/>

    <remap unless="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_front_bottom/depth/image_rect" to="/spencer/sensors/rgbd_front_bottom/depth/image_raw"/>

    <remap unless="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_top/depth/image_rect"  to="/spencer/sensors/rgbd_rear_top/depth/image_raw"/>

    <remap unless="$(arg uncompress_rgbd)" from="/spencer/sensors/rgbd_rear_bottom/depth/image_rect"  to="/spencer/sensors/rgbd_rear_bottom/depth/image_raw"/>

    <!-- This script launches either rosbag play or rqt_bag, and searches for all relevant bag files for the active sensor modalities in the given folder -->

    <node name="playback_wrapper" pkg="spencer_bagfile_tools" type="play.py" output="screen" required="$(arg required)" ns="/spencer/sensors" clear_params="true"> <!-- sub-namespace only applied for relative topic names in bagfile -->

      <!-- Either give a list of files... -->

      <param name="files" value="$(arg files)"/>

      <!-- Or an entire folder containing bagfiles prefixed with laser_, front_rgbd_, etc. -->

      <param name="folder" value="$(arg folder)"/>

      <param name="laser" value="$(arg laser)"/>

      <param name="front_rgbd" value="$(arg front_rgbd)"/>

      <param name="rear_rgbd" value="$(arg rear_rgbd)"/>

      <param name="rqt" value="$(arg rqt)"/>

      <param name="pause" value="$(arg pause)"/>

      <param name="loop" value="$(arg loop)"/>

      <param name="rosbag_play_args" value="$(arg rosbag_play_args)"/>

      <param name="initial_wait_time" value="$(arg initial_wait_time)"/>

    </node>

  </group>

  <!-- TF EXCLUSIONS -->

  <group if="$(arg remap_tf)">

    <remap from="tf_old" to="/spencer/sensors/tf_in_bagfile"/>

    <node name="tf_filter" pkg="spencer_bagfile_tools" type="tf_filter.py" args="_exclude:='[]'"/>

  </group>

  <!-- RGB-D PROCESSING -->

  <group if="$(arg depth)">

    <!-- Uncompress RGB-D -->

    <group if="$(arg uncompress_rgbd)">

      <include file="$(find spencer_bagfile_tools)/launch/components/uncompress_rgbd.launch">

        <arg name="sensor_name" value="rgbd_front_top"/>

      </include>

      <include file="$(find spencer_bagfile_tools)/launch/components/uncompress_rgbd.launch">

        <arg name="sensor_name" value="rgbd_front_bottom"/>

      </include>

      <include file="$(find spencer_bagfile_tools)/launch/components/uncompress_rgbd.launch">

        <arg name="sensor_name" value="rgbd_rear_top"/>

      </include>

      <include file="$(find spencer_bagfile_tools)/launch/components/uncompress_rgbd.launch">

        <arg name="sensor_name" value="rgbd_rear_bottom"/>

      </include>

    </group>

    <!-- Generate point clouds -->

    <group unless="$(arg no_point_clouds)" ns="/spencer/sensors/">

      <!-- Front sensors -->

      <group if="$(arg front_rgbd)">

        <include file="$(find spencer_bagfile_tools)/launch/components/generate_pointcloud.launch">

          <arg name="sensor_name" value="rgbd_front_top"/>

        </include>

        <include file="$(find spencer_bagfile_tools)/launch/components/generate_pointcloud.launch">

          <arg name="sensor_name" value="rgbd_front_bottom"/>

        </include>

      </group>

      <!-- Rear sensors -->

      <group if="$(arg rear_rgbd)">

        <include file="$(find spencer_bagfile_tools)/launch/components/generate_pointcloud.launch">

          <arg name="sensor_name" value="rgbd_rear_top"/>

        </include>

        <include file="$(find spencer_bagfile_tools)/launch/components/generate_pointcloud.launch">

          <arg name="sensor_name" value="rgbd_rear_bottom"/>

        </include>

      </group>

    </group>

  </group>

  <!-- Relay original RGB-D images to throttled visualization topics (for playback, we don't need compression and throttling) -->

  <group if="$(arg relay_rgbd_for_visualization)" ns="relay_rgbd_for_visualization">

    <node pkg="nodelet" type="nodelet" name="manager" args="manager" output="screen"/>

    <include file="$(find spencer_bagfile_tools)/launch/components/relay_rgbd_for_visualization.launch">

      <arg name="camera" value="rgbd_front_top"/>

    </include>

    <include file="$(find spencer_bagfile_tools)/launch/components/relay_rgbd_for_visualization.launch">

      <arg name="camera" value="rgbd_front_bottom"/>

    </include>

    <include file="$(find spencer_bagfile_tools)/launch/components/relay_rgbd_for_visualization.launch">

      <arg name="camera" value="rgbd_rear_top"/>

    </include>

      <include file="$(find spencer_bagfile_tools)/launch/components/relay_rgbd_for_visualization.launch">

      <arg name="camera" value="rgbd_rear_bottom"/>

    </include>

  </group>

  <!-- Create RGB and depth panoramas for visualization -->

  <group if="$(arg panoramas)" ns="/spencer/sensors">

    <node if="$(arg front_rgbd)" name="panorama_rgb_front" pkg="spencer_bagfile_tools" type="panorama_builder" args="_topics:='/spencer/sensors/rgbd_front_top/rgb /spencer/sensors/rgbd_front_bottom/rgb' _inplane_rotations:='0.0 180.0' _vertical:=true _output_topic:='/spencer/sensors/rgbd_front_panorama/rgb'"/>

    <node if="$(arg rear_rgbd)" name="panorama_rgb_rear" pkg="spencer_bagfile_tools" type="panorama_builder" args="_topics:='/spencer/sensors/rgbd_rear_top/rgb /spencer/sensors/rgbd_rear_bottom/rgb' _inplane_rotations:='0.0 180.0' _vertical:=true _output_topic:='/spencer/sensors/rgbd_rear_panorama/rgb'"/>

    <group if="$(arg depth)">

      <node if="$(arg front_rgbd)" name="panorama_depth_front" pkg="spencer_bagfile_tools" type="panorama_builder" args="_topics:='/spencer/sensors/rgbd_front_top/depth /spencer/sensors/rgbd_front_bottom/depth' _inplane_rotations:='0.0 180.0' _vertical:=true _output_topic:='/spencer/sensors/rgbd_front_panorama/depth'"/>

      <node if="$(arg rear_rgbd)" name="panorama_depth_rear" pkg="spencer_bagfile_tools" type="panorama_builder" args="_topics:='/spencer/sensors/rgbd_rear_top/depth /spencer/sensors/rgbd_rear_bottom/depth' _inplane_rotations:='0.0 180.0' _vertical:=true _output_topic:='/spencer/sensors/rgbd_rear_panorama/depth'"/>

    </group>

  </group>

  <!-- VELODYNE POINT CLOUD GENERATION -->

  <group if="$(arg velodyne)">

    <include file="$(find velodyne_pointcloud)/launch/VLP16_points.launch"/>

  </group>

  <!-- ROBOT URDF -->

  <group if="$(arg urdf)">

    <include file="$(find spencer_description)/launch/publish.launch"/>

  </group>

  <!-- VISUALIZATION -->

  <node name="rviz" pkg="rviz" type="rviz" args="-d $(arg rviz_config_file)" required="false" if="$(arg visualization)"/>

</launch>

可以看到解压缩，rosbag info 以下别人的bag file

topics:

/spencer/sensors/rgbd_front_top/depth/camera_info 720 msgs : sensor_msgs/CameraInfo
/spencer/sensors/rgbd_front_top/depth/image_raw/compressedDepth 720 msgs : sensor_msgs/CompressedImage
/spencer/sensors/rgbd_front_top/rgb/camera_info 691 msgs : sensor_msgs/CameraInfo
/spencer/sensors/rgbd_front_top/rgb/image_raw/compressed 691 msgs : sensor_msgs/CompressedImage

发现记录的都是压缩格式的深度图，和彩色图

于是需要解压缩

别人的uncompress_rgbd.launch

<launch>

    <arg name="sensor_name"/>

    <group ns="/spencer/sensors/$(arg sensor_name)">
　　　　　<!--注意这里是base topic就是说这个base topic下的所有topic都会被变换-->

        <node name="republish_rgb"   pkg="image_transport" type="republish" args="compressed in:=rgb_recorded/image_color raw out:=rgb/image_raw"/>

        <node name="republish_depth" pkg="image_transport" type="republish" args="compressedDepth in:=depth_recorded/image_raw raw out:=depth/image_raw"/>

    </group>

</launch>

发现用到了image_transport

于是去看

http://wiki.ros.org/image_transport

和

http://wiki.ros.org/image_transport_plugins

下面是本文采用的launch file，使用compressed imge节省了空间

在弄这个launch file 的时候出了错误，rosbag记录正确，但是image_view就是没有图像，问题在于remap出错了，应该放在node里，或者放在rosbag node前面

<launch>

 	<!-- Important: Use simulated time published on /clock topic, otherwise TF will be broken -->

  	<param name="/use_sim_time" value="true"/>

	<node pkg="rosbag" type="play" name="rosbag" args="--clock --queue=5 --delay=0 --start=0 --duration=99999999 --rate=1   --loop $(find vision_obstacles_avoidance)/bags/xtion.bag">

		<remap  from="/vision_obstacles_avoidance/xtion/depth_registered/image_raw/compressedDepth" to="/vision_obstacles_avoidance/xtion/depth_registered_recorded/image_raw/compressedDepth"/>

    	<remap   from="/vision_obstacles_avoidance/xtion/rgb/image_raw/compressed" to="/vision_obstacles_avoidance/xtion/rgb_recorded/image_color/compressed"/>

	</node>

	<!--注意这里是base topic就是说这个base topic下的所有topic都会被变换-->

    <group ns="/vision_obstacles_avoidance/xtion">

		<node name="republish_rgb"   pkg="image_transport" type="republish" args="compressed in:=rgb_recorded/image_color raw out:=rgb/image_raw"/>

		<node name="republish_depth" pkg="image_transport" type="republish" args="compressedDepth in:=depth_registered_recorded/image_raw raw out:=depth_registered/image_raw"/>

    </group>

</launch>

　

rosbag record --duration=15  /vision_obstacles_avoidance/xtion/depth_registered/image_raw/compressedDepth /vision_obstacles_avoidance/xtion/depth_registered/camera_info /vision_obstacles_avoidance/xtion/rgb/image_raw/compressed /vision_obstacles_avoidance/xtion/rgb/camera_info -O xtion

rosbag record --duration=15 /vision_obstacles_avoidance/xtion/depth/image_raw/compressedDepth /vision_obstacles_avoidance/xtion/depth/camera_info /vision_obstacles_avoidance/xtion/rgb/image_raw/compressed /vision_obstacles_avoidance/xtion/rgb/camera_info -O xtion

　

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