uv_coordinates.rb in tracksperanto-2.2.0

- old
+ new

@@ -1,5 +1,7 @@
-# Y down X right, 0 is center and values are UV float -1 to 1, doubled
+# Syntheyes and some other apps use a relative UV coordinate sustem. For Syntheyes, zero is at the
+# optical center of the image, and goes positive right and up. Since Tracksperanto works in absolute
+# pixels we need to convert to and fro.
 module Tracksperanto::UVCoordinates
   
   # UV coords used by Syntheyes and it's lens distortion algos.
   def absolute_to_uv(abs_x, abs_y, w, h)
     [convert_to_uv(abs_x, w), convert_to_uv(abs_y, h) * -1]
\ No newline at end of file