facing a problem with mexfile

I am working on object tracking from cluttered backgound using superpixel segmentation. I am working in Matla 2013a and visual studio2010. The segmentation is coded as a cpp file SLIC_mex.cpp inside which another c file is invoked called as SLIC.cpp. Whenever i try to compile SLIC_mex.cpp the following error occurs.

Creating library C:\Users\SREELA~1\AppData\Local\Temp\mex_HoLUo1\templib.x and object C:\Users\SREELA~1\AppData\Local\Temp\mex_HoLUo1\templib.exp 
SLIC_mex.obj : error LNK2019: unresolved external symbol "public: virtual __cdecl SLIC::~SLIC(void)" (??1SLIC@@UEAA@XZ) referenced in function mexFunction 
SLIC_mex.obj : error LNK2019: unresolved external symbol "public: void __cdecl SLIC::DoSuperpixelSegmentation_ForGivenNumberOfSuperpixels(unsigned int const *,int,int,int * &,int &,int const &,double const &)" (?DoSuperpixelSegmentation_ForGivenNumberOfSuperpixels@SLIC@@QEAAXPEBIHHAEAPEAHAEAHAEBHAEBN@Z) referenced in function mexFunction 
SLIC_mex.obj : error LNK2019: unresolved external symbol "public: __cdecl SLIC::SLIC(void)" (??0SLIC@@QEAA@XZ) referenced in function mexFunction 
SLIC_mex.mexw64 : fatal error LNK1120: 3 unresolved externals 

    F:\MATALA~1\BIN\MEX.PL: Error: Link of 'SLIC_mex.mexw64' failed. 

Warning: Function C:\Users\sreelakshmipc\Documents\MATLAB\log.m has the same name as a
MATLAB builtin. We suggest you rename the function to avoid a potential name conflict. 
> In mex_helper>runCmdInShell at 86
  In mex_helper at 53
  In mex at 204 
Error using mex (line 206)
Unable to complete successfully.