comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » about label regions

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: about label regions [message #30607 is a reply to message #30523]

Mon, 06 May 2002 14:13

Ted Cary
Messages: 53
Registered: October 2001

Member

Xiaoying Jin wrote:

> I know there is a function 'label_region' built in IDL. But that is for the
> case a lot of disconnected regions seperated by background. However, In my
> case, there is no backgound, all the regions connect with some other
> regions.
>>
>> I have an graylevel image that having a lot of touching regions. The
>> pixels in the same region have the same gray level and they connect
>> with each other. How can I give each of these regions a unique label?
>>

> But the regions maybe have the same gray level if they do not connect
> with each other. So if I use WHERE or HISTOGRAM, it will not discriminate
> those regions with the same gray level. But I want label each of them a
> unique label.
> Any suggestion?

Xiaoying Jin,

My suggestion is to provide a link to your image. I think I understand what
you're talking about now: something like a grayscale photograph of a jar of
marbles? All the marbles are touching touching each other, so there is no
background. Two marbles of the same color may not belong to the same region.
You want to give a unique label to each marble/region.

If the regions to label are each in a different grayscale range or--even
better--if each region is uniformly gray, then this problem is not difficult.
You can use WHERE or HISTOGRAM like David suggested to get a mask of regions
at each gray level, and then use LABEL_REGION on each mask. If there are
contiguous regions of exactly the same gray level that must be identified,
things are more complicated--you'd have to differentiate based on shape or
maybe use some of the morphology functions.

Before I tell you how to continue, is this the type of problem you are talking
about? Remember, a link to a picture would help a lot.

Good luck,

TC

Report message to a moderator

[Message index]

		about label regions By: xje4e on Sun, 05 May 2002 21:21
		Re: about label regions By: Ted Cary on Mon, 06 May 2002 22:22
		Re: about label regions By: Xiaoying Jin on Mon, 06 May 2002 22:53
		Re: about label regions By: Ted Cary on Mon, 06 May 2002 17:00
		Re: about label regions By: Xiaoying Jin on Mon, 06 May 2002 14:37
		Re: about label regions By: Ted Cary on Mon, 06 May 2002 14:13
		Re: about label regions By: Xiaoying Jin on Mon, 06 May 2002 12:53
		Re: about label regions By: David Fanning on Mon, 06 May 2002 11:12
		Re: about label regions By: Xiaoying Jin on Mon, 06 May 2002 10:05

Previous Topic:	Mac OS X
Next Topic:	suppressing carriage return in PRINT

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 11:31:57 PDT 2025

Total time taken to generate the page: 0.55973 seconds