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Hi,I have the same problem with Cerin,but when I ran the launch file like Cerin's /webcam_lsd_slam.launch, it have some errors:

core service [/rosout] found
ERROR: cannot launch node of type [usb_cam/usb_cam_node]: usb_cam
ROS path [0]=/opt/ros/indigo/share/ros
ROS path [1]=/home/zuo/ros_ws/lsd_slam/src
ROS path [2]=/home/zuo/ros_ws/ws_uav/src
ROS path [3]=/home/zuo/ros_ws/ws_ethzasl_ptam/src
ROS path [4]=/opt/ros/indigo/share
ROS path [5]=/opt/ros/indigo/stacks
process[usb_cam/to_mono_node1-2]: started with pid [21536]
ERROR: cannot launch node of type [image_view/image_view]: image_view
ROS path [0]=/opt/ros/indigo/share/ros
ROS path [1]=/home/zuo/ros_ws/lsd_slam/src
ROS path [2]=/home/zuo/ros_ws/ws_uav/src
ROS path [3]=/home/zuo/ros_ws/ws_ethzasl_ptam/src
ROS path [4]=/opt/ros/indigo/share
ROS path [5]=/opt/ros/indigo/stacks
[ERROR] [1470734987.261875629]: Skipping XML Document "/opt/ros/indigo/share/hector_pose_estimation  hector_pose_estimation_nodelets.xml" which had no Root Element.  This likely means the XML is malformed or missing.

and my workspace is like:

~/lsd_slam
    src/
        /lsd_slam
            /lsd_slam
            /lsd_slam_core
            /lsd_slam_viewer
        /lsd_slam_test
           /launch
                /webcam_lsd_slam.launch

Thank in advance!