sunbingfengPI

I used the old DBOW2 library(commit id: `67edcbc16903b314e9f19fd0bce6e93eef5e6635`) instead. You could set the `GIT_TAG` to use the history commit to hack over it. ``` ExternalProject_Add(${name} PREFIX ${DEPENDENCY_DIR} GIT_REPOSITORY http://github.com/dorian3d/${name} GIT_TAG...

You are welcome! @junzhang2016

Maybe you should disable `DEBUG_IMAGE` in loop_fusion module, and it will thus release input image after keyframe construction. @zgxsin