Posted by
Wilfred L. Guerin on
May 19, 2008; 4:05pm
URL: http://imagej.273.s1.nabble.com/isolating-lichens-from-the-background-tp3696183p3696184.html
I will see if any of our extrapolation and signals analysis systems
are effective on your data, we had quite a round pulling 3d structure
data out of common images of particulate materials like granite or
coral sculpture (where pixel color values at depth are identical
mathematically to particles locally) and in crystals. Also, we have
had good (huge) results with orgaic system correlation, namely
identification of trees or plants in environmental modeling by reverse
modeling known (hint plant identification lookup books)
characteristics and correlating statistically their structure. (system
handles abstract data set creation with physically proven generators
(plant growth simulation) to accurately model current and
historical/future organic composition.)
In your case, most flat plants have a fairly standard growth pattern,
obviously using this as the differential bounds to identify the finite
size and density of growth is suitable, otherwise, isolate solids
statistically and search color based extensions or groupings.
Either way, fuzzy things represented as pixles are never very accurate.
If you control the image collection, it is very easy to use a few
plastic spheres (balls) and a few images of each target area to
exponentiate a 3d representation of your target, thus allowing for
accurate isolation and modeling of growth.
For ij in 2d, statistical color histograms (ired/uv camera) to isolate
targets, filters, then accumulate particles with certain localization
affinity.
Patterns in the sand ;)
Counting particles was never hard!
On 5/16/08, Charles R Parker <
[hidden email]> wrote:
> I'm new to image processing and ImageJ, so please bear with me. I need to
> be able to measure the area of healthy and necrotic lichens in
> photographs. Examples are at
http://dlia.org/images/Parker/ParkerTIFS.html>
> So far, I have not been able to isolate the lichen from the background,
> let alone measure anything. I would appreciate any suggestions anyone may
> have on a suitable approach.
>
> Thanks,
> Chuck
> =========================
> Charles R. Parker, Ph.D.
> Research Aquatic Biologist
> U. S. Geological Survey
> 1316 Cherokee Orchard Road
> Gatlinburg, TN 37738
>
> E-mail:
[hidden email]
> Phone: (865) 436-1704
>