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Re: Finding the regions automatically

Posted by Herbie on Feb 17, 2018; 9:00am
URL: http://imagej.273.s1.nabble.com/Finding-the-regions-automatically-tp5020109p5020131.html

Good day,

as I wrote before, my macro gives exactly and reproducibly 203 (not 207
as you write) areas for the provided sample image, where the last is the
space around the disc.

Of course you must decide if an area is too small to be counted and
correspondingly enter this value to the Analyze Particles dialog.

"The image has so many domains that I can't check manually, may I
know what to do? Is there any way to check that the total area of
domains are almost perfect?"

If counting about 200 areas by hand is too much for you, then you have
to live with what you get. If you dilate or erode differently, you will
get different results. You have to decide what's acceptable for you.

Most importantly, you should perfectly understand what the proposed
macros are doing.

Regards

Herbie

:::::::::::::::::::::::::::::::::::::::::
Am 17.02.18 um 02:56 schrieb anusuya pal:

> Hello everyone,
>
> Thanks for giving me different suggestions.
>
> Replying to Michael's question, Can't you simply run 'Analyze Particles'? I
> think I can't just do it, to get the accurate results, I need to do some
> work before we just use 'analyze particles'. If I do so on the raw image,
> there are some lines which are not perfectly continuous, there are gaps,
> and if I just do analyze particles, it takes some of the gaps as particles
> and count the area, which I think is not correct. However I did this and
> got sum of the areas as 499130 pixel^2 with counts 633.
>
> Replying to Cammer's suggestion, Threshold, Erode,Analyze, if I erode, yes,
> the lines will be perfectly continuous, but the lines become thicker, I
> should do to make those lines thin again, otherwise the areas of the
> domains are not perfect. However, I did this, I got the count as 211 and
> sum as 580561.
>
> Now, comes to Herbie's and Jeremy's approaches. Herbie's approach gives
> counts as 207 with sum as 425532 and Jeremy's macro gives 186 with 495383
> pixel^2. The image has so many domains that I can't check manually, may I
> know what to do? Is there any way to check that the total area of domains
> are almost perfect?
>
> Thanks
> Anu
>
>
>
>
>
>
> On Fri, Feb 16, 2018 at 10:00 AM, Cammer, Michael <
> [hidden email]> wrote:
>
>> Theshold
>> Erode
>> Analyze particles
>>
>> Michael Cammer, Sr Research Scientist, DART Microscopy Laboratory
>> NYU Langone Health, 540 First Avenue, SK2 Microscopy Suite, New York, NY
>> 10016
>> C: 914-309-3270  [hidden email]  http://nyulmc.org/micros
>> http://microscopynotes.com/
>>
>>
>>
>> -----Original Message-----
>> From: anusuya pal [mailto:[hidden email]]
>> Sent: Thursday, February 15, 2018 5:34 PM
>> To: [hidden email]
>> Subject: Finding the regions automatically
>>
>> Hello,
>>
>> Greetings of the day!
>>
>> I have a binary image, and want to find the area of each of the domains. I
>> can do that with nearest neighbor tool by selecting each domain and to add
>> in roiManager, and then to measure the area of each domain.
>>
>> I want to know is there any other way so that the selection of the domains
>> can be done automatically?
>>
>> For convenience, attaching the binary image (a_75) and the output image
>> obtained from nearest neighbor tool showing one domain in red color. Your
>> help will be appreciated!
>>
>> Thanks in advance!
>> Anu
>>
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