How to change subscribed topics of depth_image_proc/point_cloud_xyz node??

edit

Hi, how do I change the topic subscriptions of depth_image_proc's depth_image_proc/point_cloud_xyz node?

I have made a node which publishes a sensor_msgs/Image topics which is:

/face_detector/depth_image_roi

Through openni_launch, I also have topic camera/depth/camera_info published.

If I understand correctly, the depth_image_proc/point_cloud_xyz node subscribes to the following topics:

depth/camera_info (sensor_msgs/CameraInfo)
depth_registered/image_rect (sensor_msgs/Image)

As such, I think I have the required topics published.

I found this. However, I don't know how to change the topic subscriptions to suit my needs.

Any help would be appreciated!

edit 1:

rosnode info /standalone_nodelet:

    Node [/standalone_nodelet]
    Publications: 
     * /point_cloud/points [sensor_msgs/PointCloud2]
     * /rosout [rosgraph_msgs/Log]
     * /standalone_nodelet/bond [bond/Status]

    Subscriptions: 
     * /camera/rgb/camera_info [sensor_msgs/CameraInfo]
     * /face_detector/depth_image_roi [sensor_msgs/Image]
     * /face_detector/rgb_image_roi [sensor_msgs/Image]
     * /standalone_nodelet/bond [bond/Status]

    Services: 
     * /standalone_nodelet/get_loggers
     * /standalone_nodelet/list
     * /standalone_nodelet/load_nodelet
     * /standalone_nodelet/set_logger_level
     * /standalone_nodelet/unload_nodelet

[....]

depth_image_proc/point_cloud_xyz launch file:

<!-- Convert the depth image and the rgb image into a xyzrgb Point Cloud -->
<launch>
    <!-- Nodelet manager for this pipeline -->
    <node pkg="nodelet" type="nodelet" args="manager" name="standalone_nodelet" output="screen"/>

    <!-- Convert to point cloud -->
    <node pkg="nodelet" type="nodelet" name="depth_image_proc" args="load depth_image_proc/point_cloud_xyzrgb standalone_nodelet" output="screen">

        <!-- Input: Camera calibration and metadata.  (sensor_msgs/CameraInfo) -->
        <remap from="rgb/camera_info" to="/camera/rgb/camera_info"/>

        <!-- Input: Rectified color image. (sensor_msgs/Image) -->
        <remap from="rgb/image_rect_color" to="/face_detector/rgb_image_roi"/>

        <!-- Input: Rectified depth image, registered to the RGB camera. (sensor_msgs/Image) -->
        <remap from="depth_registered/image_rect" to="/face_detector/depth_image_roi"/>

        <!-- Output: XYZ point cloud. If using PCL, subscribe as PointCloud<PointXYZ>.  (sensor_msgs/PointCloud2)  -->
        <remap from="depth_registered/points" to="/point_cloud/points"/>

    </node>
</launch>

Also based on depth_image_proc's lazy subscribing behavior, my face_detector node subscribes to output /point_cloud/points.

Without subscribing to the output, the depth_image_proc/point_cloud_xyz node will not subscribe to the required topics stated above.