Fourier descriptor to compare curves 3D
in [Matlab]
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From: fraisa1985 Youssef on 9 Jul 2010 16:16 Hello, I'm working on an 3D face recognition problem. Each face is characterized with a 3D curve 3D, so i have to compare theses 3D curve. To be invariant of the origin point i would use Fourier descriptor to compare theses 3D curves. Please help me . Best regards.
From: Matt J on 9 Jul 2010 16:38 "fraisa1985 Youssef" <meguebli(a)gmail.com> wrote in message <i18024$89e$1(a)fred.mathworks.com>... > Hello, > I'm working on an 3D face recognition problem. > Each face is characterized with a 3D curve 3D, so i have to compare theses 3D curve. > To be invariant of the origin point i would use Fourier descriptor to compare theses 3D curves. ============== I doubt there will be many responses seeing as you've haven't described where in your problem you've gotten stuck. Nevertheless, I don't know how you'd define Fourier descriptors for 3D curves. I thought it possible only in 2D, so I'd be interested in any feedback you get.
From: Alan B on 9 Jul 2010 18:14 "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i181bc$ohg$1(a)fred.mathworks.com>... > "fraisa1985 Youssef" <meguebli(a)gmail.com> wrote in message <i18024$89e$1(a)fred.mathworks.com>... > > Hello, > > I'm working on an 3D face recognition problem. > > Each face is characterized with a 3D curve 3D, so i have to compare theses 3D curve. > > To be invariant of the origin point i would use Fourier descriptor to compare theses 3D curves. > ============== > > I doubt there will be many responses seeing as you've haven't described where in your problem you've gotten stuck. > > Nevertheless, I don't know how you'd define Fourier descriptors for 3D curves. I thought it possible only in 2D, so I'd be interested in any feedback you get. I'm not too familiar with Fourier descriptors, but what if you just found the descriptors for two pairs of your coordinates (ie, the x-y descriptors, plus the y-z descriptors)? Or the descriptors for the curvature and torsion of the curve, with respect to arc length?
From: fraisa1985 Youssef on 9 Jul 2010 19:09 "Alan B" <monguin61REM(a)OVETHIS.yahoo.com> wrote in message <i186vb$u4$1(a)fred.mathworks.com>... > "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i181bc$ohg$1(a)fred.mathworks.com>... > > "fraisa1985 Youssef" <meguebli(a)gmail.com> wrote in message <i18024$89e$1(a)fred.mathworks.com>... > > > Hello, > > > I'm working on an 3D face recognition problem. > > > Each face is characterized with a 3D curve 3D, so i have to compare theses 3D curve. > > > To be invariant of the origin point i would use Fourier descriptor to compare theses 3D curves. > > ============== > > > > I doubt there will be many responses seeing as you've haven't described where in your problem you've gotten stuck. > > > > Nevertheless, I don't know how you'd define Fourier descriptors for 3D curves. I thought it possible only in 2D, so I'd be interested in any feedback you get. > > I'm not too familiar with Fourier descriptors, but what if you just found the descriptors for two pairs of your coordinates (ie, the x-y descriptors, plus the y-z descriptors)? Or the descriptors for the curvature and torsion of the curve, with respect to arc length? thank you for you answer. First, there are some works who extends the Fourier descriptor for 3D, i'm also not familiar with fourier descriptor but i'm sure there are some extension of Fourier Descriptor for 3D. My goal is to compare the 3D curve , i would use the Fourier Descriptor because she is invariant from the origin point. Theses somes examples of 3D curve. [URL=http://img686.imageshack.us/i/58766448.png/][IMG]http://img686.imageshack.us/img686/2028/58766448.png[/IMG][/URL] Uploaded with [URL=http://imageshack.us]ImageShack.us[/URL] [URL=http://img401.imageshack.us/i/11646552.png/][IMG]http://img401.imageshack.us/img401/377/11646552.png[/IMG][/URL] Uploaded with [URL=http://imageshack.us]ImageShack.us[/URL] if you have another idea to compare theses 3D curves please tell me. Best regards
From: fraisa1985 Youssef on 9 Jul 2010 19:31
"Alan B" <monguin61REM(a)OVETHIS.yahoo.com> wrote in message <i186vb$u4$1(a)fred.mathworks.com>... > "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i181bc$ohg$1(a)fred.mathworks.com>... > > "fraisa1985 Youssef" <meguebli(a)gmail.com> wrote in message <i18024$89e$1(a)fred.mathworks.com>... > > > Hello, > > > I'm working on an 3D face recognition problem. > > > Each face is characterized with a 3D curve 3D, so i have to compare theses 3D curve. > > > To be invariant of the origin point i would use Fourier descriptor to compare theses 3D curves. > > ============== > > > > I doubt there will be many responses seeing as you've haven't described where in your problem you've gotten stuck. > > > > Nevertheless, I don't know how you'd define Fourier descriptors for 3D curves. I thought it possible only in 2D, so I'd be interested in any feedback you get. > > I'm not too familiar with Fourier descriptors, but what if you just found the descriptors for two pairs of your coordinates (ie, the x-y descriptors, plus the y-z descriptors)? Or the descriptors for the curvature and torsion of the curve, with respect to arc length? Thank you for your answers, it good idea is to just found the descriptors for two pairs of my coordinates, have you an idea how i can implement him please ? Also can you explain more the descriptors for the curvature and torsion of the curve, with respect to arc length? Best regards |