Plot optical image illuminance (lux) as a mesh
oiPlotIlluminance(oi,yScale,roiFlag)
The default scaling of the lux axis is logarithmic. Set yScale to 'linear' for a
linear scale.
If roiFlag is set to true (1), the user selects a region of the image
from the optical image window. Otherwise the entire image is plotted.
In the GraphWin, set Tools | Move Camera to rotate the view.
Copyright ImagEval Consultants, LLC, 2003.