Re: [zvtm-devel] concave effect

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Do you have any idea how to change the  algorithm to give a defish
?Maybe you can tell me and I can do this change


On Tue, Mar 18, 2008 at 9:49 PM, Kleber Magno <kle...@gm...> wrote:
> Emmanuel,
>  I don't have any information about the radial or magnification but all
>  image look have same parameters I will try some possibility.
>  thanks very much for your replay. I will try change thw code and
>  investigate how to solve this problem.
>
>  best great
>
>  On Tue, Mar 18, 2008 at 5:01 PM, Emmanuel Pietriga
>
>
> <emm...@in...> wrote:
>  > You should be, though it is not easy to say for sure from this small
>  >  cropped image. Do you have any information on the original fisheye
>  >  properties (e.g. magnification factor in the center, radius) ?
>  >
>  >   From what Isee, I would apply a radial L(2) lens with a linear
>  >  profile, outer radius that covers the whole fisheye, and inner radius
>  >  of 1. For the magnification factor MM, it looks like the original is 2
>  >  or 3, so the compensating one would be the inverse of this (I think, I
>  >  haven't done the maths, just what I think it should be to compensate).
>  >  But it is difficult to tell from this small image.
>  >
>  >  Note that there is a problem with lenses that have a mag factor MM in
>  >  [0;1]. It kind of works for values relatively close to 1, but at some
>  >  point the lens just no longer works. That's something I have to fix,
>  >  but I haven't got the time to fix it yet (the demand for such lenses
>  >  isn't that big :-) ).
>  >
>  >  Emmanuel
>  >
>  >
>  >
>  >  On 18 mars 08, at 18:22, Kleber Magno wrote:
>  >
>  >  > OK,
>  >  > So I have this attach image and I need defish.So with [0;1] can I get
>  >  > a inverse effect?
>  >  > Kleber
>  >  >
>  >  >
>  >  >
>  >  > On Tue, Mar 18, 2008 at 1:48 PM, Emmanuel Pietriga
>  >  > <emm...@in...> wrote:
>  >  >> You mean a magnification factor between 0 and 1? Can you show me an
>  >  >> example. I'll tell you if a lens can "compensate" for it or not. Note
>  >  >> that I'm afraid compensating (if I understand correctly what you
>  >  >> intend to do) will involve information loss since there might be up-
>  >  >> to-
>  >  >> two subsampling steps involved in inverse-fisheye'ing an already
>  >  >> fisheye'd view.
>  >  >>
>  >  >> Emmanuel
>  >  >>
>  >  >>
>  >  >>
>  >  >> On 18 mars 08, at 17:00, Kleber Magno wrote:
>  >  >>
>  >  >>> Hi Emmanuel,
>  >  >>>
>  >  >>> I have some images with fisheye effect and I need remove it.  So I
>  >  >>> think that one algorithm like fisheye with magnitude negative.
>  >  >>> thanks
>  >  >>>
>  >  >>>
>  >  >>> On Tue, Mar 18, 2008 at 12:25 PM, Emmanuel Pietriga
>  >  >>> <emm...@in...> wrote:
>  >  >>>> Hello. What do you mean by "concave effect"? Can you show an
>  >  >>>> example
>  >  >>>> of what you want to achieve?
>  >  >>>>
>  >  >>>> Emmanuel
>  >  >>>>
>  >  >>>>
>  >  >>>>
>  >  >>>>
>  >  >>>> On 18 mars 08, at 14:10, Kleber Magno wrote:
>  >  >>>>
>  >  >>>>> Hi!
>  >  >>>>> I need a concave effect. How I can do it? I try many
>  >  >>>>> implementation
>  >  >>>>> of Lens..
>  >  >>>>>
>  >  >>>>> Thanks
>  >  >>>>> Kleber
>  >  >>>>>
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>  >  >>>>
>  >  >>>> --
>  >  >>>> Emmanuel Pietriga
>  >  >>>> INRIA Futurs - Projet In Situ    tel : +33 1 69 15 34 66
>  >  >>>> Bat 490, Université Paris-Sud    fax : +33 1 69 15 65 86
>  >  >>>> 91405 ORSAY Cedex FRANCE     http://www.lri.fr/~pietriga
>  >  >>>>
>  >  >>>>
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>  >  >>>>
>  >  >>>
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>  >  >>
>  >  >> --
>  >  >> Emmanuel Pietriga
>  >  >> INRIA Futurs - Projet In Situ    tel : +33 1 69 15 34 66
>  >  >> Bat 490, Université Paris-Sud    fax : +33 1 69 15 65 86
>  >  >> 91405 ORSAY Cedex FRANCE     http://www.lri.fr/~pietriga
>  >  >>
>  >  >>
>  >  >> -------------------------------------------------------------------------
>  >  >> This SF.net email is sponsored by: Microsoft
>  >  >> Defy all challenges. Microsoft(R) Visual Studio 2008.
>  >  >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
>  >  >> _______________________________________________
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>  >  >>
>  >  > <
>  >  > rf
>  >  > .PNG
>  >
>  >
>  > > >
>  >  > -------------------------------------------------------------------------
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>  >  > Defy all challenges. Microsoft(R) Visual Studio 2008.
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>  >
>  >  --
>  >  Emmanuel Pietriga
>  >  INRIA Futurs - Projet In Situ    tel : +33 1 69 15 34 66
>  >  Bat 490, Université Paris-Sud    fax : +33 1 69 15 65 86
>  >  91405 ORSAY Cedex FRANCE     http://www.lri.fr/~pietriga
>  >
>  >
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