Need help!!...Sea grass selection

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Need help!!...Sea grass selection

amphipod
I am a student working on seagrass coverage in the waters of Malaysia.  I want to know if there is easier way for me to crop only the grass blades using color selections..etc...

The sample UW photo that I am working on can be viewed at  http://rsb.info.nih.gov/ij/images/sea-grass.jpg

Thank you in advance...
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Re: Need help!!...Sea grass selection

Marcel
Hello,

i can highly recommend you to use the Threshold Colour plugin in your special case.
http://imagejdocu.tudor.lu/imagej-documentation-wiki/plugins

With your image it works good in the HSB and CIE Lab colour space to work out the leaves.
If this is sufficient for your work you can for example threshold the image in this dialog.
Then convert the image to 8-bit (Image->Type->8-bit) and threshold the black areas with
Image->Adjust->Threshold (will be coloured red).
You can now make a particle analysis Analyse->Analyse Particles (Set the values you want to measure
in the "Set Measurements" dialog). In the "Analyse Particles" dialog you can select
at which size the particles should be counted (because there will be a
little bit "noise" in your image).

Before you do this please improve the quality of your image with imageJ or a standard image
tool like Gimp etc. to work out the colours!

I hope this information helps

With kind regards

Marcel



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Re: Need help!!...Sea grass selection

Marcel
In reply to this post by amphipod
Apropos,

you may be also interested in the siox plugin for Gimp (a java implementation exists too!).

http://www.siox.org/

It is integrated in the developer version of Gimp.

With kind regards

Marcel