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Finally, I have found a temporary "way-around" solution:
The cause of this problem is that the current highgui lib used by ROS does not have the Qt support, so with such libs, the programmer could not use those new Qt functions in OpenCV.
So my way to solve it is to download the newest OpenCV 2.4.2 source from the official site, then compile it by myself, and then use the compiled new highgui libs to replace the old ones in ROS, then everything goes fine~
The compile procedure of OpenCV 2.4.2 on Ubuntu 12.04 can be easily found through Google.
