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# 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]
end
def convert_to_uv(absolute_value, absolute_side)
x = (absolute_value / absolute_side.to_f) - 0.5
# .2 to -.3, y is reversed and coords are double
x * 2
end
def convert_from_uv(absolute_side, uv_value)
# First, start from zero (-.1 becomes .4)
value_off_corner = (uv_value.to_f / 2) + 0.5
absolute_side * value_off_corner
end
end
Version data entries
20 entries across 20 versions & 1 rubygems