sal: Saliency detection using kd-trees.
kdtree: Allow partially overlapping patches.
kdtree: Forgot to add header.
sal: Proper distance measure, 50% overlapping patches.
sal: Add initial propagation.
sal: Completely normalize color distance.

Mellows out results much better.
sal: Resize and combine saliency maps.
sal: Propagate only the best matches.
sal: Track of best two matches in a poor-mans heap.
sal: Propagate best 2 matches.

Now we compare up to 40 nearest-neighbor tuples.
(8*2top*2left*query)