Border Energy classifier for region filtering

[CattleProdigy]

Border energy attempts to find a measure of a region with high feature-to-background contrast in an attempt to discard homogeneous, less-salient regions. Regions with border energy below some threshold are discarded.

Border energy is defined as the average Sobel Edge Magnitude of all border pixels in a region.

The paper proposes a "simple adaptive threshold" not based on std-dev or variance.

See: http://en.wikipedia.org/wiki/Sobel_operator#Formulation
for Sobel Edge detection and magnitude.

[CattleProdigy]

The calculation for Border Energy is done. The paper mentions a 'simple adaptive threshold' as the actual decision for this region classifier. The paper is vague. Right now the decision is a dumb threshold set to an empirically chosen number