storing keypoints

[Jérôme Kieffer]

Dear pythonistas,

I am wondering what is the best way to store (in python) SIFT keypoints
to exchange them (serialize, save, load-back, ...) SIFT is a keypoint
extraction algorithm for images so it transforms a 2D image into
n-keypoints; each keypoint being composed of 4floats
(x, y, scale, orientation) and 128 uint8.

* I would like to use at best numpy machinery. 
* record array look indicated but the 128xuint8 block is likely to be tedious
* I would like to be able to separate directly the float from uint8.

Maybe nx36 float with 32 float being actually 128uint  and use
recordarrays and views ? 

Any idea?
Thanks.

-- 
Jérôme Kieffer <google at terre-adelie.org>