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Shape Context Based Corresponding Point Models


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Shape Context Based Corresponding Point Models



24 Mar 2011 (Updated )

Shape Context based nonrigid registration of 2D/3D objects, to build Active Shape Models

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Shape Context is a method to get an unique descriptor (feature vector) for every point of an object contour or surface. This descriptor is used in combination with a b-spline free form deformation grid, for fully automatic creation of point mappings between surfaces of patient datasets (2D/3D).

The 2D Example will create a corresponding point model (PCM) for a set of 10 2D hand contours.

The 3D Example will create a PCM for a set of 10 3D jaw triangulated surfaces.

There are also examples using the PCM's to train and use 2D/3D Active Shape Models (ASM) and Active Appearance Models (AAM). (folder "ActiveModels_version7")

The 2D example takes a couple of minutes. The 3D-example about 7 hours, and requires 64bit Matlab.

The non-rigid mapping between datasets is kept Diffeomorphic to prevent mesh folding. But the optimizer doesn't succeeded in all cases of the 3D-example (maybe in next update)

- The examples, will compile some c-coded functions into MEX files. In case of failure slower Matlab coded functions will be used.
- Most functions in this zip-archive are also available as standalone files on the File-Exchange, and can be newer/updated.

MATLAB release MATLAB 7.11 (R2010b)
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Comments and Ratings (13)
21 Oct 2013 Dirk-Jan Kroon

Please, look for the references in:

21 Oct 2013 WONG

hello.can you tell me the original paper you referred to when writing the programs"Shape Context Based Corresponding Point Models".

19 Feb 2013 Mark Sena

Trying to run on OSX 10.7.5, but getting the error:
/Applications/ line 305: gcc-4.2: command not found
-> gcc-4.2 -c -I/Applications/ -I/Applications/ -DMATLAB_MEX_FILE -fno-common -no-cpp-precomp -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -fexceptions -DMX_COMPAT_32 -O2 -DNDEBUG "Features2CostMatrix.c"

/Applications/ line 1326: gcc-4.2: command not found

mex: compile of ' "Features2CostMatrix.c"' failed.

Any help is appreciated.
Can't wait to use it!

06 Oct 2012 Xiangqi  
06 Oct 2012 Xiangqi

Thank you for providing the code.

I am trying to use the ShapeContext function. It seems that the demo data "testdata.mat" in the folder "ShapeContext_version2" doesn't contain the correct data.

24 Apr 2012 Dirk-Jan Kroon

Knnsearch is part of the "Statistics Toolbox" of Matlab. Maybe you can find a similar but free implementation on the File Exchange

24 Apr 2012 Birgit

When I run BuildingModels\Example3D the function createns(), knnsearch() and maybe others called by Horn_Align_ICP are missing. Could the deliver be incomplete?

24 Apr 2012 Birgit  
18 Feb 2012 Li Cheng

I found MATLAB code for active contours model in 1998 for a long time. Then found it. Really a good job!

23 Sep 2011 l.l.

Hi! I don't understand how to set landmarks on my 3D dataset. I have to manually fix them on each image?
Thanks in advance and I apologize if the claim proves foolish.

10 Jun 2011 M M

how long should the 2D example take to run?

10 May 2011 wang

why I can not download it?

24 Mar 2011 Sebastien PARIS

A master piece ...

26 Jan 2012

Many bugs solved. Less memory usage.

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