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Re: Image proceesing in IDL [message #60791]

Fri, 13 June 2008 16:59

enod
Messages: 41
Registered: November 2004

Member

On Jun 14, 1:28 am, arun <mailtosa...@gmail.com> wrote:
> Hi,
> I have a tiff image of the dimesion 3000 x 3000 which is actually a
> gray scale image.I want to calculate the amount of soil,water and air
> present in the image.I tried using histogram to apply threshold but
> its not working fine.Can anyone suggest me how to do it.I am an
> invoice so any help would be appreciated.Below is the code which i
> have used.
>
> nPixels = n_elements(rotateImg)
>
soilSubscripts = where(rotateImg ge 24000and rotateImg lt 30000,
~~syntax error?
> nSoilPixels)
>
> percentSoil = float(nSoilPixels) / nPixels
>
> waterSubscripts = where(rotateImg ge 18000 and rotateImg lt 23000,
> nWaterPixels)
>
> percentWater = float(nWaterPixels) / nPixels
>
> PRINT, percentSoil
> PRINT, percentWater
>
> With Regards
> Arun

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Re: Image proceesing in IDL [message #60799 is a reply to message #60791]

Fri, 13 June 2008 12:05

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

David,
he probably meant novice, so I don't think there is money in this for you.
:-)

Haje

"David Fanning" <news@dfanning.com> wrote in message
news:MPG.22bc6119510b49aa98a3ac@news.frii.com...
> arun writes:
>
>> I am an invoice ...
>
> Darn. If you were a check, it would be easier. :-(
>
> What exactly seems to be going wrong here? Why do
> you think it is "not working"?
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Image proceesing in IDL [message #60805 is a reply to message #60799]

Fri, 13 June 2008 10:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

arun writes:

> I am an invoice ...

Darn. If you were a check, it would be easier. :-(

What exactly seems to be going wrong here? Why do
you think it is "not working"?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: Image proceesing in IDL [message #60806 is a reply to message #60805]

Fri, 13 June 2008 10:44

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Jun 13, 12:28 pm, arun <mailtosa...@gmail.com> wrote:
> Hi,
> I have a tiff image of the dimesion 3000 x 3000 which is actually a
> gray scale image.I want to calculate the amount of soil,water and air
> present in the image.I tried using histogram to apply threshold but
> its not working fine.Can anyone suggest me how to do it.I am an
> invoice so any help would be appreciated.Below is the code which i
> have used.
>
> nPixels = n_elements(rotateImg)
>
> soilSubscripts = where(rotateImg ge 24000and rotateImg lt 30000,
> nSoilPixels)
>
> percentSoil = float(nSoilPixels) / nPixels
>
> waterSubscripts = where(rotateImg ge 18000 and rotateImg lt 23000,
> nWaterPixels)
>
> percentWater = float(nWaterPixels) / nPixels
>
> PRINT, percentSoil
> PRINT, percentWater
>
> With Regards
> Arun

Looks fine to me - what does 'its not working fine.' mean, exactly?

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Re: Image proceesing in IDL [message #60898 is a reply to message #60806]

Mon, 16 June 2008 11:07

arun
Messages: 6
Registered: June 2008

Junior Member

Hi Vince,
The histogram contains 2 peaks of the same size.SO the result
has to be 50% each.But the output is as follows.....
Soil Percent = 0.140934
Water percent = 0.140398

I want to know is there any method to calculate themfrom histogram

Thanks & Regards
Arun

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