Unexpected Feature Behavior

So I may be barking up the wrong tree here but I was using the feature detection just to do some basic edge detection of an object and I guess maybe I took the wrong approach to the problem but I expected the edges of the object to be "features" and not minor details inside of the feature.. I tried different thresholds to no avail..

http://i.imgur.com/k2V3Pz6.png <-- Note a lot of "Edges" are not shown as features despite the threshold being low (5).

Start by reproducing the feature-detection behavior with the attached image and the reported threshold of 5, then read the feature-detection entry point used by the example. Compare the detected features with the object's visible edges and determine whether the behavior is expected or requires a documented correction.

Written by the indexing model from the issue text.