# nisha.m234

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1. ## Unwrap a 3D fingerprint (convert to 2D)

Hey, I need to unwrap a 3D fingerprint (convert to 2D). I cannot just remove z coordinate and make it 2D. I need to unwrap it in a manner that it resembles as if the fingerprint would have been scanned as 2D at first place. The input I am having is a ply file with just the x,y,z coordinates. Any suggestion? Any software out there that will do it for me directly? I heard there are some spring solvers that will do it for me. Any idea how can I implement it? I want to do it the easy way rather than getting into too much complexity. Thanks!
2. ## Curvature Estimation

Yes, I read through those references. I am not good in maths so was not able to understand much. I see same formulae that's there on slides the same is there in those references! could not get much help. I thought people here would be able to relate to this methods and could help me better. Thanks!
3. ## Curvature Estimation

[color=#000000][font=Verdana, Arial, Helvetica, sans-serif][size=2]I have to implement this method on Page 42 http://www.global-edge.titech.ac.jp/faculty/hamid/courses/shapeAnalysis/files/2.BasicNotions.pdf Here is the dataset : Dragon dataset of http://graphics.im.ntu.edu.tw/~robin/courses/cg03/model/ The output should look like Page 44 on above pdf file. I am having problem to code it in C++. Can anyone code it for me in C++ or provide some psedocode for me to start. Any help appreciated! Thanks! [/font]
4. ## 3D FingerPrint - need to extract ridges and valleys? Estimation Curvatures

[color="#000000"][font="Verdana, Arial, Helvetica, sans-serif"]any updates?? anyone ??[/font] [/quote] bit of update on my side: http://www.grasshopper3d.com/forum/topics/3d-fingerprint-need-to-1
5. ## 3D FingerPrint - need to extract ridges and valleys? Estimation Curvatures

[color=#000000][font=Verdana, Arial, Helvetica, sans-serif][size=2]any updates?? anyone ??[/font]

done!!
7. ## 3D FingerPrint - need to extract ridges and valleys? Estimation Curvatures

[font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"]Hello,[/font] [font="Verdana, Geneva, Tahoma, sans-serif"] [/font] [font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"]I need to extract ridges and valleys of a 3D fingerprint. The output should be a ply file which shows exactly where are the ridges and valleys on 3d fingerprint using different colors.[/font] [font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"]Input file** - ply file with just x,y,z locations. I got it from a 3d scanner. Email me on nisha.m234@gmail.com for the input file. [/font] [font="Verdana, Geneva, Tahoma, sans-serif"] [/font] [font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"]**Algorithm:**[/font] [font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"]I am trying to find principal curvatures for extracting the ridges and valleys. [/font] [font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"][color="#000000"][font="arial, verdana, tahoma, sans-serif"]http://www.global-ed...asicNotions.pdf[/font][/font][font="Verdana, Geneva, Tahoma, sans-serif"][color="#333333"][color="#000000"][font="arial, verdana, tahoma, sans-serif"] [/font](in the file see page 42. You can read from page 30. I am trying to achieve something like that.) [/font]