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Re: How to eliminate smaller blob from label_region image [message #77334 is a reply to message #77333]

Tue, 23 August 2011 04:18

Wout De Nolf
Messages: 194
Registered: October 2008

Senior Member

On Mon, 22 Aug 2011 23:30:15 -0700 (PDT), vijay s
<vijayans.in@gmail.com> wrote:

>
> hi,
>
> thanks for the help and that works fine, now i have the required
> blob (only 2 blob, both are separated and adjacent to each other).
> Now i want to merge both and make as a single blob and want to find
> the new center.
>
> thanks

What do you mean by "new center"? I suppose the center of mass of the
combination of the two blobs? If you know you must have two blobs, you
don't need to remove the small blobs. Just get the blob index of the
two largest blobs and calculate the center of mass of the combined
blob.

; Get image
path=FILEPATH('pollens.jpg',SUBDIR=['examples','demo','demod ata'])
READ_JPEG, path, image

; Get blob indices
b = LABEL_REGION(image gt 160)

; Get population and members of each blob
h = HISTOGRAM(b, REVERSE_INDICES=r)

; Blob indices of the two largest blobs
h[0]=0 ; background
ind=(reverse(sort(h)))[0:1] ; two largest
ind=b[r[r[ind]]] ; get blob indices

; Get the center of mass of the combined blob
b=b eq ind[0] or b eq ind[1]
totalMass = Total(b)
s=size(b,/dim)
xcm = Total( Total(b, 2) * lindgen(s[0]) ) / totalMass
ycm = Total( Total(b, 1) * lindgen(s[1]) ) / totalMass

; Show result
loadct,3
tvscl,b
tmp=indgen(11)-5
plots,xcm,ycm+tmp,/device,color=150
plots,xcm+tmp,ycm,/device,color=150
print,'Center of mass: ',xcm,ycm

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[Message index]

		Re: How to eliminate smaller blob from label_region image By: David Fanning on Tue, 23 August 2011 05:02
		Re: How to eliminate smaller blob from label_region image By: Wout De Nolf on Tue, 23 August 2011 04:18
		Re: How to eliminate smaller blob from label_region image By: vijay s on Mon, 22 August 2011 23:30
		Re: How to eliminate smaller blob from label_region image By: David Fanning on Mon, 22 August 2011 05:37
		Re: How to eliminate smaller blob from label_region image By: Wout De Nolf on Mon, 22 August 2011 01:13
		Re: How to eliminate smaller blob from label_region image By: rogass on Wed, 31 August 2011 05:00

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