| Variance in sub-sections? [message #29399] |
Fri, 15 February 2002 13:06  |
Joshua Nipper
Messages: 8
Registered: February 2002
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Junior Member |
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I have a 512x512 image, and I would like to calculate the mean/variance in a
3x3 neighborhood around every pixel. What would be the easiest way to do
this w/out for loops?
Thanks
Josh
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| Re: Variance in sub-sections? [message #29442 is a reply to message #29399] |
Wed, 20 February 2002 19:37  |
JD Smith
Messages: 850
Registered: December 1999
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Senior Member |
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Craig Markwardt wrote:
>
> "Martin Downing" <martin.downing@ntlworld.com> writes:
>
>> Hi There!
>>
>> Funny I was intending to reply to this thread a few days ago, but as time
>> was pressing decided to wait and see, thanks david for doing the work!
>> The population_estimate thread was in response to Craig noting the ambiguity
>> in my terminology, most people on the planet would have named it "sample",
>
> Please, *please* say you aren't confusing me with JD :-)
I should hope there are worse epithets, Craig ;)
JD
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| Re: Variance in sub-sections? [message #29467 is a reply to message #29399] |
Tue, 19 February 2002 08:30 |
Martin Downing
Messages: 136
Registered: September 1998
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Senior Member |
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Errm - oops. Sorry Craig and for that matter JD! I was writting my response
rather hastily and before morning coffee.
Lets just say it was a typo. On the matter of confusing, well I normally
confuse everyone !
Martin
> Please, *please* say you aren't confusing me with JD :-)
>
> Craig
>
> --
> ------------------------------------------------------------ --------------
> Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
> Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
> ------------------------------------------------------------ --------------
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| Re: Variance in sub-sections? [message #29470 is a reply to message #29399] |
Tue, 19 February 2002 07:03 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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"Martin Downing" <martin.downing@ntlworld.com> writes:
> Hi There!
>
> Funny I was intending to reply to this thread a few days ago, but as time
> was pressing decided to wait and see, thanks david for doing the work!
> The population_estimate thread was in response to Craig noting the ambiguity
> in my terminology, most people on the planet would have named it "sample",
Please, *please* say you aren't confusing me with JD :-)
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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