for the archive...
"Analyze" > "Particle Analyzer" fit ellipse seems to be a good option to
estimate the length and width. major/minor axis of the ellipse
should be approximately equal to length/width of the food grains.
Furthermore this option should have the advantage to be not so sensitive
to noise, shadow or ragged borders of the food grains.
- select straight "Analyze" > "Set Scale"
(set Known Distance and Unit of length)
- select dirt and "Edit" > "Clear"
- "Image" > "Type" > 8-Bit
- "Process" > "Binary" > "Make Binary"
- "Analyse" > "Set Measurements" > Fit ellipse
- "Analyse" > "Anaylse Particles"
- Show > Outlines, Display results, Clear results,
Summarize, Add to Manager, Record Stat ...
- OK, "Major"/"Minor" in Results = length/wide of fitted ellipse.
Christof
Am 20-09-2012 16:44, schrieb Christof Kluß:
> Hi
>
> I would like to estimate the length and width of food grains. There is
> an article about exactly this topic (Igathinathane et al., 2009). But I
> do not find a tutorial how to do this mesasurement.
>
> Do you know instructions, or rather plugins, for this task?
>
> thx
> Christof
>
>
> C. Igathinathane, L.O. Pordesimo, W.D. Batchelor, Major orthogonal
> dimensions measurement of food grains by machine vision using ImageJ,
> Food Research International, Volume 42, Issue 1, January 2009, Pages
> 76-84, ISSN 0963-9969,
http://dx.doi.org/10.1016/j.foodres.2008.08.013>
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http://imagej.nih.gov/ij/list.html>
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