[theora] NHW Project - improvement of NHW Neatness Metrics

[Raphael Canut]

Hello,

I have improved the NHW Neatness Metrics.This new version better modelizes
neatness/sharpness around the contours of image.This new version is then
better and the metric is more significative of neatness of image, even if
it is still perfectible.

Update at: http://nhwcodec.blogspot.com/

Many thanks!
Cheers,
Raphael
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