http://imagej.273.s1.nabble.com/Java-SIFT-plugin-for-ImageJ-Question-on-parametage-tp3694919p3694922.html
> Hello, everybody,
>
> Is there anybody who knows a lot about the Java SIFT plugin provided
> by Stephan Saalfeld <mailto:
[hidden email]>?
> I also send this message to Stephan Saalfeld
> <mailto:
[hidden email]> but I need some quick answers to make my
> project move.
>
> I'm using the SIFT plugin to extract the salient points and I played
> with the parameters.
>
> In the "Java SIFT parameters explanation.doc" I find some inconsistency.
> * Steps per scale octave*: Keypoint candidates are extracted at
> all scales between /maximum image size/ and /minimum image size/.
>
> * *Minimum image size*: The Scale Space stops if the size of the
> octave would be smaller than /minimum image size/. *Tip*: Increase
> the minimum size to discard large features (i.e. those extracted
> from looking at an image from far, such as the overall shape).
> * *Maximum image size*: The Scale Space starts with the first octave
> equal or smaller than the /maximum image size/. *Tip*: By reducing
> the size, fine scaled features will be discarded, favoring larger
> features. Larger features are more likely to remain constant
> across serial sections. Increasing the size beyond that of the
> actual images has no effect.
>
> I don't understand why if I enlarger the maximum image size, I'll
> discard the larger features ....
> I presume that the larger features are for the larger scale, right?
> Then larger scale can only be detected in larger window.
>
> I think I just badly understand these two parameters.
>
> Can anyone explain a little bit?
>
> cheers, Xin
>
>
>