Hi,
We are producing depth or range images of rough surfaces, and are seeking to
quantify them by using Gary Chinga's excellent SurfCharJ plug-in.
We have calibrated the image in the spatial sense (set scale...), each pixel
is given a size in microns or mm.
And we can calibrate it in the depth sense, each grey level equals to some
distance in mm or micron.
We understand that the scale for x-y must be in the same units as the depth
scale.
We presume that the distance per grey level is to be set using the Calibrate
menu item.
If anyone has used this plugin in anger can they please provide a simple
guide to the production of a suitably calibrated image.
I think that the followings steps are necessary.
1. Spatially calibrate the X-Y dimensions with set scale.
2. Calibrate the grey levels, should be linear in mm with each grey level
representing the increment in depth between each level.
3. Convert the image to 32 bit depth.
Run the surfcharj plugin.
As part of this process it seems that a simple calibration of the grey scale
to depth should be possible, as in his case we know that each grey level is
produced by a set increment in depth. And the relationship is linear.
So if anyone can provide some simple pointers I would be grateful.
Noel
Noel Goldsmith
Air Vehicles Division
DSTO
506 Lorimer Street
Port Melbourne
3207 Victoria
AUSTRALIA
613 96267527
0428364003
[hidden email]
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