[ptx] question about SIFT

[Guillaume Brice Mainbourg]

Hi Xianyong,

I share the same problem you had, a long time ago, for the algorithm of
SIFT. Would you explain me how to resample the Gaussian image that has
twice the initial value of sigma? And can you explain me what to do with
this?

I am currently using only one octave and get at best 6 extrema. Non of
them survive the accurate keypoint localization so I am in big troubles.

Last question: what is an autopona?

Thanks in advance for your help,

Guillaume