Detection Of water bodies from rest of the image

2012 3 21
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I want to extract only water bodies from rest of the image..how can i do this efficiently? Can anyone help me?

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Image Analyst
Image Analyst 2012-3-21
Where did you upload your image to?
Gaurav
Gaurav 2012-3-28
Sir i want to extract only the water part as shown in the following image..
http://www.freemalaysiatoday.com/wp-content/uploads/2011/01/No-water-electricity-roads-in-Jabus-constituency-1.jpg
Please help me to achieve this efficiently...

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Sean de Wolski
Sean de Wolski 2012-3-21

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I = your_image;
for ii = size(I,1):-1:1
for jj = size(I,2):-1:1);
water(ii,jj) = isWet(I(ii,jj,:))
end
end
Now you just need to write isWet().

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Gaurav
Gaurav 2012-3-23
Thanks for your reply...
But I am confused about what to write in isWet.Is this a threshold function for pixel values corresponding to water color? or anything else?
Please help me as i m very new to image processing and matlab...
Thank u.

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Gaurav
Gaurav 2012-3-26

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Thanks for your reply... But I am confused about what to write in isWet.Is this a threshold function for pixel values corresponding to water color? or anything else? Please help me as i m very new to image processing and matlab... Thank u.

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Image Analyst
Image Analyst 2012-3-26
It looks like Sean's joke went over your head. But you still have a chance to respond to my comment about posting your image.
Gaurav
Gaurav 2012-3-28
Sir i want to extract only the water part as shown in the following image..
http://www.freemalaysiatoday.com/wp-content/uploads/2011/01/No-water-electricity-roads-in-Jabus-constituency-1.jpg
Please help me to achieve this efficiently...

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