On Jun 17, 10:39=A0am, "edward.s.mei...@[EMAIL PROTECTED]
" <mei...@[EMAIL PROTECTED]
>
wrote:
> On Jun 17, 5:03 am, rajani_sp <rajani...@[EMAIL PROTECTED]
> wrote:
>
>
>
>
>
> > On Jun 17, 12:54 pm, Martin Leese <ple...@[EMAIL PROTECTED]
>
> > wrote:
>
> > > Arutperumjothi wrote:
> > > > On Jun 17, 10:34 am, Martin Leese
<ple...@[EMAIL PROTECTED]
>
> > > > wrote:
> > > >> Arutperumjothi wrote:
> > > >>> Hi all,
> > > >>> I am new to image processing . i have two images taken with
differ=
ent
> > > >>> white balance adjustments.
> > > >>> i need to compare this and say which one has more white balance
. =
Can
> > > >>> anybody tell me how can I do this. =A0I am trying out this with
Ma=
trox
> > > >>> image processing library and AForge.Net.
> > > >> Don't understand. =A0I understand what white
> > > >> balance is. =A0I don't understand what you
> > > >> mean by "more white balance". =A0I don't see
> > > >> how white balance can be something you can
> > > >> have more of.
> > > > Sorry for not being clear in query.
> > > > I have taken two images with web cam by =A0white balance
adjustments=
( I
> > > > guess i should be saying correcting white balance ) . I need to
> > > > compare the two images. Please tell me how can i compare these two
> > > > images.
>
> > > Compare for what purpose? =A0What is your
> > > goal? =A0Why do you want to do this?
>
> > > Also, stuffing the two images on a website
> > > somewhere and posting the link is always
> > > helpful.
>
> > > There are many ways to compare two images.
> > > For example, you can just look at them.
>
> > > --
> > > Regards,
> > > Martin Leese
> > > E-mail: ple...@[EMAIL PROTECTED]
> > > Web:http://members.tripod.com/martin_leese/-Hidequoted
text -
>
> > > - Show quoted text -
>
> > Hi,
>
> > Thank you for the response. =A0I have uploaded the images in the below
> >
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.jpe=
g
> > I have to compare the images and output the result as =A0which of the
> > images
> > has the =A0correct white balance. In the pictures in the above link we
> > can see the
> > second image looks more natural. =A0 Ofcourse manually we can see both
> > images
> > and say which of them is better. Similarly i compare the luminosity of
> > the two images
> > and say which one is brighter picture. =A0Hope this is clear.
>
> > Thanks
> > Rajani
>
> You can't determine which image has the correct white balance unless
> you know the spectral response (i.e. color) of the objects in the
> image. To say "manually we can see both images and say which of them
> is better," assumes that you know a priori the color of the wall. If
> the wall is painted a yellowish off-white, then the image on the left
> is correct; if the wall is painted white, then the image on the right
> is correct; if the wall is painted pink, then neither is correct.
>
> Ed M- Hide quoted text -
>
> - Show quoted text -
-----------------------------------------
Ed, you're correct and I think he knows it so that's why he amended
his post to just wanting some way to compare the two images. That's
why I suggested Delta E. It won't be calibrated but I think he's just
looking for something quick and dirty.
Regards,
ImageAnalyst
By the way, are you related to the famous Aden Meinel who founded the
Optical Sciences Center at the University of Arizona?
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