[josm-dev] Plugin: Access layer pixel data

[Nick Ma.]

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I'm working on a plugin like "Tracer2"[1] but which should run
entirely embedded into JOSM.

Therefore I'm asking for the best way to access pixel color shown in
an active Layer[2] or ImageryLayer?

Why/Background/Next steps (that's not the question):
To execute an edge detection[3] algorithm with the image information
and auto detect the edges of an area currently displayed in JOSM.
Helping to faster create buildings.

Any hints appreciated.
Best, Nick

[1] http://wiki.openstreetmap.org/wiki/JOSM/Plugins/Tracer2
[2] JAVA::org.openstreetmap.josm.gui.layer.Layer
[3] https://en.wikipedia.org/wiki/Edge_detection
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