IMPROVED
/*
- One set of keyframes (e.g. 500 KF) is copied to local dir, but only
few are used for raw feature extraction --> SLOW
==> copy 30 secs, extract features 12 secs, finalize 10 secs

- Different features (e.g. rgbsift, csift, etc) use different keyframe
sets --> NOT SHARED --> SLOWER
- Some params (AveKeyPointPerKeyFrame = 1,000) should be revised, eg.
for harlap (<1K). 
 */

/*
 * Use /tmp (host) dir instead of gszTmpDir (another server)
 */