Advice request: Recognizing and measuring diseased leaf areas

[Jonathan Rosenthal]

I'd greatly appreciate any suggestions as to how I can use ImageJ on  
scanned, color images of leaves to detect several different plant  
diseases and to measure the areas affected (they turned yellow or  
brown or grew small bumps on the surface).
     Thanks very much,

Jonathan Rosenthal
Visiting Scholar
Dept. of Biology
Vassar College

[Jean-Yves Tinevez-2]

On Sep 15, 2009, at 8:56 AM, Jonathan Rosenthal wrote:

> I'd greatly appreciate any suggestions as to how I can use ImageJ on  
> scanned, color images of leaves to detect several different plant  
> diseases and to measure the areas affected (they turned yellow or  
> brown or grew small bumps on the surface).
>    Thanks very much,

Can you put an image somewhere?
 From what you say it concerns Color-based image segmentation, so I  
would try to use Color Deconvolution:

http://www.dentistry.bham.ac.uk/landinig/software/cdeconv/cdeconv.html

It is an awesome plugin that can separate your image according to  
certain color, initially meant to deal with immunostaining. It would  
allow you to separate the image of te leave from the brown bumps, that  
you could then process separately.
Your image should be relatively flat.

Cheers
jy



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Jean-Yves Tinevez
PFID - Imagopole
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