ros_opentld

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Hi,

I created a workspace and cloned ROS_openTLD from https://github.com/Ronan0912/ros_opentld, and I run it in the following way, cd ros_opentld ; source devel/setup.sh ; roslaunch tld_tracker ros_tld_tracker.launch ; roslaunch tld_tracker ros_tld_gui.launch.

but I don't know why there is always no image showing on the tld_gui window. I thought maybe I need to edit 'image_topic' in the launch file to the specific topic I used, but I don't know how to modify the <remap from="image" to="$(arg image_topic)"/>. I'm not sure whether the modification is necessary. I am new to ROS and sorry I ask the silly question. Someone else know the problem and can help? Thank you.