Comments on: Sparse Field Active Contours

By: grace

grace — Mon, 01 Mar 2010 13:58:03 +0000

Thanks Shawn,
Your code is good.The “localized_seg_demo.m” run well.I’m trying this now.
I have the same problem but already find the “fat_contour”.However,I have another problem at:??? Error using ==> delete Error in ==> visualize_phi at 6 delete(h1); I don’t know why the error is occur!

By: fralik

fralik — Thu, 11 Feb 2010 10:30:00 +0000

@fralik
Oh! Found it here http://www.mathworks.com/matlabcentral/fileexchange/26101-active-contours-a-new-distribution-metric-for-image-segmentation

By: fralik

fralik — Thu, 11 Feb 2010 10:16:19 +0000

Trying to run it. There is no “sfm_chanvese_demo” file. But that is not a real problem. I got an error about function “fat_contour”. Matlab can not find it =(

By: Rajeev

Rajeev — Tue, 26 Jan 2010 06:53:07 +0000

Thanks Shawn – appreciate your quick response.

I had wanted to know if there were any other dependencies other than the “Matrix” data structure (I haven’t looked exhaustively at the C++ code). From your response it seems there aren’t, which answers my question.

I’ll post the converted code soon.

Rajeev

By: Shawn Lankton

Shawn Lankton — Sun, 24 Jan 2010 23:51:28 +0000

@Rajeev Thanks for your interest. There are several Matlab libraries used in the code. In general, Matlab MEX programs use the internal Matlab “Matrix” data-structures. You can easily strip these out and use simple data arrays. This is the underlying data-type in the data-structures in the “Matrix” element.

By: Rajeev

Rajeev — Fri, 22 Jan 2010 12:01:29 +0000

Hi Shawn,

Thanks for sharing the Sparse Field Active Contours algo.

Since bulk of the algo is written in C++ and the .m files are only used as wrappers, I am trying to convert this algo as a standalone Windows application – i.e. trying to remove all the Matlab dependencies.

For this I’m plan on compiling the C++ code in VC++ 2008 and then convert all the Matlab .m files to C++ code.

However, when I compile the C++ code (energy3c.cpp, llist.cpp, lsops3c.cpp, and sfm_local_chanvese_mex.cpp) in VC++ 2008, the compiler gives an error where it reports a dependency on “matrix.h” – which is a Matlab header file. (used for “mxArray” in “Sparse3c.h”).

Would you know how to remove the dependency of “matrix.h” and other Matlab specific dependencies, so that one can compile and execute the entire algo as a stanadalone VC++ application?

Thanks again.

Rajeev

By: Wliao

Wliao — Tue, 22 Dec 2009 22:15:16 +0000

Thank you very much for sharing with us, it is very good job!

By: Shawn Lankton

Shawn Lankton — Wed, 09 Dec 2009 13:16:56 +0000

I had the same thought! Please see this paper: Localizing Region-Based Active Contours (publications page). I hope to publish my codes for this soon.

By: Naveen

Naveen — Wed, 09 Dec 2009 08:32:46 +0000

Shawn,
Have this question: I need to segment out a region surrounded by multiple shades of boundary. That would mean we need multiple uout (mean of exterior pixels intensity). Or is there a way to restrict uout to a localised region?How do I use your code?

By: Shawn Lankton

Shawn Lankton — Tue, 24 Nov 2009 13:48:37 +0000

@Quinn All of the source is provided. You can feel free to modify any of the files to implement specific behaviors, but typically new energies can be implemented by modifying solely energy3c.cpp.