| Re: color value interpolation from colorbar [message #64214 is a reply to message #64128] |
Thu, 04 December 2008 18:35   |
j.coenia@gmail.com
Messages: 36
Registered: December 2008
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Thanks everyone. Sorry for the delay, I had to generate the requested
pics and create a Picasa web album. If there is a better way to post
images to usenet forums, please let me know.
Below is the Picasa link to the two images requested by Vince and
Paolo, (1) an example frame grab of a scan, and (2) its colorbar RGB
plotted against colorbar location:
http://picasaweb.google.com/j.coenia/ColorInterpolation?auth key=H9iPrIqxX1c#
To answer Jeremy's question, the colorbar length is 140 pixels or so
(scaled here from 1 to 100 on the x axis, which is vertical in the
scan). You can see from the plot that the colorbar sampling is
"garbagy." There are two very bright artifacts, at approximately x=20
and x=80. Such outliers can be tossed or smoothed out somehow I
think. For simplicity, I just sampled the values down the vertical
center of the colorbar, as the colorbar tends to bleed a little into
the dark background near the edges (more errors).
Jeremy's answer makes some sense to me. So is it possible to
reasonably guess the color levels in that artery using the colorbar on
the side of the scan? I know there is no scale on the colorbar --
I've been instructed to assume linear gradient from 1 to 100.
Radiologists and researchers use these colors; can the computer
quantify them to extract more meaningful information?
Thanks again.
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