tested rootSIFT


git-svn-id: http://lire.googlecode.com/svn/trunk@181 f280a053-6817-128d-8a7e-cdf98506035a
optimized a single thing, moved memory allocation out of the loop.

git-svn-id: http://lire.googlecode.com/svn/trunk@182 f280a053-6817-128d-8a7e-cdf98506035a