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area and intensity threshold in images [message #93540] Tue, 16 August 2016 00:33 Go to next message
gunvicsin11 is currently offline  gunvicsin11
Messages: 93
Registered: November 2012
Member
Hello,
I need to search for pixels by giving both area as well as intensity threshold,

For example if i need to give area threshold is 1 arcmin^2 and intensity threshold 1.35

how to search for the pixel which satisfies both these criteria.

Any ideas?

thanks

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Re: area and intensity threshold in images [message #93547 is a reply to message #93540] Wed, 17 August 2016 09:03 Go to previous messageGo to next message
Craig Markwardt is currently offline  Craig Markwardt
Messages: 1869
Registered: November 1996
Senior Member
On Tuesday, August 16, 2016 at 3:33:21 AM UTC-4, sin wrote:
> Hello,
> I need to search for pixels by giving both area as well as intensity threshold,
>
> For example if i need to give area threshold is 1 arcmin^2 and intensity threshold 1.35
>
> how to search for the pixel which satisfies both these criteria.
>
> Any ideas?

What does an area threshold mean? Does it mean some contiguous number of pixels?

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Re: area and intensity threshold in images [message #93562 is a reply to message #93540] Thu, 18 August 2016 21:44 Go to previous messageGo to next message
gunvicsin11 is currently offline  gunvicsin11
Messages: 93
Registered: November 2012
Member
On Tuesday, August 16, 2016 at 1:03:21 PM UTC+5:30, sin wrote:
> Hello,
> I need to search for pixels by giving both area as well as intensity threshold,
>
> For example if i need to give area threshold is 1 arcmin^2 and intensity threshold 1.35
>
> how to search for the pixel which satisfies both these criteria.
>
> Any ideas?
>
> thanks

Yes exactly, for example we need to give an area threshold of 20 pixels by 20 pixels which has an intensity threshold between 1.25 to 1.35.

How can we do that? Is there any routine for that?

thanks

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Re: area and intensity threshold in images [message #93567 is a reply to message #93562] Sat, 20 August 2016 20:00 Go to previous messageGo to next message
Jeremy Bailin is currently offline  Jeremy Bailin
Messages: 618
Registered: April 2008
Senior Member
On Thursday, August 18, 2016 at 11:45:00 PM UTC-5, sin wrote:
> On Tuesday, August 16, 2016 at 1:03:21 PM UTC+5:30, sin wrote:
>> Hello,
>> I need to search for pixels by giving both area as well as intensity threshold,
>>
>> For example if i need to give area threshold is 1 arcmin^2 and intensity threshold 1.35
>>
>> how to search for the pixel which satisfies both these criteria.
>>
>> Any ideas?
>>
>> thanks
>
> Yes exactly, for example we need to give an area threshold of 20 pixels by 20 pixels which has an intensity threshold between 1.25 to 1.35.
>
> How can we do that? Is there any routine for that?
>
> thanks

I think you need to be more explicit about what you're trying to do... I can speculate, but it could be completely wrong.

-Jeremy.

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Re: area and intensity threshold in images [message #93569 is a reply to message #93567] Sun, 21 August 2016 21:01 Go to previous message
gunvicsin11 is currently offline  gunvicsin11
Messages: 93
Registered: November 2012
Member
On Sunday, August 21, 2016 at 8:30:18 AM UTC+5:30, Jeremy Bailin wrote:
> On Thursday, August 18, 2016 at 11:45:00 PM UTC-5, sin wrote:
>> On Tuesday, August 16, 2016 at 1:03:21 PM UTC+5:30, sin wrote:
>>> Hello,
>>> I need to search for pixels by giving both area as well as intensity threshold,
>>>
>>> For example if i need to give area threshold is 1 arcmin^2 and intensity threshold 1.35
>>>
>>> how to search for the pixel which satisfies both these criteria.
>>>
>>> Any ideas?
>>>
>>> thanks
>>
>> Yes exactly, for example we need to give an area threshold of 20 pixels by 20 pixels which has an intensity threshold between 1.25 to 1.35.
>>
>> How can we do that? Is there any routine for that?
>>
>> thanks
>
> I think you need to be more explicit about what you're trying to do... I can speculate, but it could be completely wrong.
>
> -Jeremy.

Actually I have binary image, the area threshold of 20 by 20 pixels has to be applied to discard unwanted regions.

thanks

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