On Jun 18, 12:21=A0am, ImageAnalyst <imageanal...@[EMAIL PROTECTED]
> wrote:
> 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
dif=
ferent
> > > > >>> 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=
Matrox
> > > > >>> 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
adjustme=
nts ( I
> > > > > guess i should be saying correcting white balance ) . I need to
> > > > > compare the two images. Please tell me how can i compare these
tw=
o
> > > > > 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/-Hidequotedtext
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>
> > > > - Show quoted text -
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> > > Hi,
>
> > > Thank you for the response. =A0I have uploaded the images in the
belo=
w
> > >
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.=
jpeg
> > > 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
w=
e
> > > can see the
> > > second image looks more natural. =A0 Ofcourse manually we can see
bot=
h
> > > images
> > > and say which of them is better. Similarly i compare the luminosity
o=
f
> > > 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. =A0 That's
> why I suggested Delta E. =A0It 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?- Hide quoted text
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>
> - Show quoted text -
Hi ImageAnalyst and Edward,
Thanks a lot for your valuable answers .
I am trying out this .
Thanks again
rajani
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