Posted by
Robert Dougherty on
URL: http://imagej.273.s1.nabble.com/Zooming-and-smoothing-tp3693324p3693335.html
Herbie,
>
>
> In any case you have to justify the "simulation" of a finer grid...
>
> HTH
>
> Herbie
Interesting point. The acoustical images are generated on a range of
scales depending on frequency and the processing algorithm, but they
always have to end up a certain size to match the optical reference
image and to look right in PowerPoint, Word, or YouTube. I could
compute them in that size (I'm giving YouTube 640 x 360 now) but it
would take longer than it needs to in some cases (low frequency). I
could scale up the acoustic image without interpolation, but then it
would look seriously wrong, and would not be what I would have gotten
by computing every pixel. I convinced myself that the band-limited
nature of the imaging is consistent with the interpolation process,
and validated this with some test cases. In the tests, the
interpolated results matched the detailed computation. Application
of a deconvolution algorithm makes the situation more interesting. It
that case, it is possible to generate high resolution nonsense.
Bob
Robert Dougherty, Ph.D.
President, OptiNav, Inc.
4176 148th Ave. NE
Redmond, WA 98052
(425)891-4883
FAX (425)467-1119
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