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在Windows下运行Felzenszwalb的Deformable Part Models(voc-release4.01)目标检测matlab源码

2014-02-20 17:19 549 查看
原文:http://blog.csdn.net/masibuaa/article/details/17577195

可变形部件模型Deformable Part Models是目前最好的目标检测算法,由Felzenszwalb提出,本文介绍如何在windows下运行Felzenszwalb给出的matlab源码。

有关Deformable Part Model参见论文

A Discriminatively Trained, Multiscale,Deformable Part Model[CVPR
2008]的中文翻译


Object Detection with Discriminatively Trained Part Based Models[PAMI 2010]的中文翻译

有关可变形部件模型(Deformable Part Model)的一些说明

Deformable Part Model 相关网页(其中有源码下载):http://www.cs.berkeley.edu/~rbg/latent/index.html

Pedro Felzenszwalb的个人主页:http://cs.brown.edu/~pff/

PASCAL VOC 目标检测挑战:http://pascallin.ecs.soton.ac.uk/challenges/VOC/

Felzenszwalb给出了matlab版本的实现,且只能运行在linux和Mac操作系统上,有网友给出了其中的第四版voc-release4.01修改后在windows上运行的方法,这里进行一下总结。

本文参考以下三篇博客:

Win7+VS2010+Matlab2011b下运行Discriminatively Trained Deformable PartModels(4.01版)代码-运行demo()-详细步骤

如何在window下运行Discriminatively Trained Deformable PartModels代码

在windows下运行Felzenszwalb的Discriminatively Trained Deformable Part Models代码

我的环境:Win7 + Matlab R2010a(其中配置VC++6.0中的c++编译器)

在网站http://www.cs.berkeley.edu/~rbg/latent/index.html上下载voc-release4.01源码并解压。

步骤1 在Matlab中配置c++编译器

在matlab命令行中输入:

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mex –setup

回车,出现提示:

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Please choose your compiler for building external interface (MEX) files:

Would you like mex to locate installed compilers [y]/n?

输入n,回车,此时会列出matlab支持的编译器:

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Select a compiler:

[1]Intel C++ 11.1 (with Microsoft Visual C++ 2008 SP1 linker)

[2]Intel C++ 9.1 (with Microsoft Visual C++ 2005 SP1 linker)

[3]Intel Visual Fortran 11.1 (with Microsoft Visual C++ 2008 SP1 linker)

[4]Intel Visual Fortran 11.1 (with Microsoft Visual C++ 2008 Shell linker)

[5]Intel Visual Fortran 10.1 (with Microsoft Visual C++ 2005 SP1 linker)

[6]Lcc-win32 C 2.4.1

[7]Microsoft Visual C++ 6.0

[8]Microsoft Visual C++ 2005 SP1

[9]Microsoft Visual C++ 2008 Express

[10]Microsoft Visual C++ 2008 SP1

[11]Open WATCOM C++

[0]None

根据自己机器上安装的VC版本,选择对应的编译器,输入序号,回车,提示:

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Your machine has a Microsoft Visual C++compiler located at

C:\Program Files\Microsoft Visual Studio.Do you want to use this compiler [y]/n?

如果自动检测给出的是正确的VC目录,输入y,否则可以输入n后手动输入VC目录。

步骤2 尝试调用compile()编译源码

将matlab工作目录设置为文件夹voc-release4.01所在的目录,在matlab命令行中输入compile,即调用compile()函数尝试编译源码,我们看看会出现什么错误,然后挨个解决,错误提示如下:

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Command line warning D4024 : unrecognizedsource file type 'resize.cc', object file assumed

Command line warning D4027 : source file'resize.cc' ignored

Command line warning D4021 : no actionperformed

说明编译器无法识别.cc文件,打开compile.m文件,如下:

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mex -O resize.cpp

mex -O dt.cpp

mex -O features.cpp

mex -O getdetections.cpp

% use one of the following depending on your setup

% 0 is fastest, 3 is slowest

% 0) multithreaded convolution using SSE

% mex -O fconvsse.cc -o fconv

% 1) multithreaded convolution using blas

% WARNING: the blas version does not work with matlab >= 2010b

% and Intel CPUs

% mex -O fconvblasMT.cc -lmwblas -o fconv

% 2) mulththreaded convolution without blas

% mex -O fconvMT.cc -o fconv

% 3) convolution using blas

% mex -O fconvblas.cc -lmwblas -o fconv

% 4) basic convolution, very compatible

% mex -O fconv.cc -o fconv

%在windows下使用时加上下面这句,并注释掉0)

mex -O fconv.cpp

发现首先会编译resize.cc,dt.cc,features.cc,getdetections.cc 这四个文件,既然不识别.cc文件,就将这四个.cc文件的扩展名都改为.cpp,同时也修改compile.m文件,将前四句改为:

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mex -O resize.cpp

mex -O dt.cpp

mex -O features.cpp

mex -O getdetections.cpp

步骤3 修改resize.cpp文件

然后调用compile(),错误提示:

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resize.cpp(36) : error C2057: expected constant expression

resize.cpp(36) : error C2466: cannot allocate an array of constant size 0

resize.cpp(36) : error C2133: 'ofs' : unknown size

resize.cpp(70) : error C2065: 'bzero' : undeclared identifier

resize.cpp(95) : error C2065: 'round' : undeclared identifier

为解决此问题,修改resize.cpp文件,在前面加上bzero和round的定义:

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#define bzero(a,b) memset(a,0,b)

int round(float a){float tmp = a-(int)a; if(tmp>=0.5) return(int)a+1;else return (int)a;}

并并修改ofs数组的定义,将

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alphainfo ofs[len];

这句改成:

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alphainfo *ofs = new alphainfo[len];

当然在同一作用域后面加上:

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delete [] ofs;

修改完后的resize.cpp文件如下:

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#include <math.h>

#include <assert.h>

#include <string.h>

#include "mex.h"

/*

* Fast image subsampling.

* This is used to construct the feature pyramid.

*/

//在windows下使用时加上下面这句

#define bzero(a,b) memset(a,0,b)

int round(float a){float tmp = a-(int)a; if(tmp>=0.5) return (int)a+1;else return (int)a;}

// struct used for caching interpolation values

struct alphainfo {

int si, di;

double alpha;

};

// copy src into dst using pre-computed interpolation values

void alphacopy(double *src, double *dst, struct alphainfo *ofs, int n) {

struct alphainfo *end = ofs + n;

while (ofs != end) {

dst[ofs->di] += ofs->alpha * src[ofs->si];

ofs++;

}

}

// resize along each column

// result is transposed, so we can apply it twice for a complete resize

void resize1dtran(double *src, int sheight, double *dst, int dheight,

int width, int chan) {

double scale = (double)dheight/(double)sheight;

double invscale = (double)sheight/(double)dheight;

// we cache the interpolation values since they can be

// shared among different columns

int len = (int)ceil(dheight*invscale) + 2*dheight;

//alphainfo ofs[len];

alphainfo *ofs = new alphainfo[len];//在windows下使用时加上这句,注释掉上面一句

int k = 0;

for (int dy = 0; dy < dheight; dy++) {

double fsy1 = dy * invscale;

double fsy2 = fsy1 + invscale;

int sy1 = (int)ceil(fsy1);

int sy2 = (int)floor(fsy2);

if (sy1 - fsy1 > 1e-3) {

assert(k < len);

assert(sy-1 >= 0);

ofs[k].di = dy*width;

ofs[k].si = sy1-1;

ofs[k++].alpha = (sy1 - fsy1) * scale;

}

for (int sy = sy1; sy < sy2; sy++) {

assert(k < len);

assert(sy < sheight);

ofs[k].di = dy*width;

ofs[k].si = sy;

ofs[k++].alpha = scale;

}

if (fsy2 - sy2 > 1e-3) {

assert(k < len);

assert(sy2 < sheight);

ofs[k].di = dy*width;

ofs[k].si = sy2;

ofs[k++].alpha = (fsy2 - sy2) * scale;

}

}

// resize each column of each color channel

bzero(dst, chan*width*dheight*sizeof(double));

for (int c = 0; c < chan; c++) {

for (int x = 0; x < width; x++) {

double *s = src + c*width*sheight + x*sheight;

double *d = dst + c*width*dheight + x;

alphacopy(s, d, ofs, k);

}

}

delete[] ofs;//在windows下使用时加上这句

}

// main function

// takes a double color image and a scaling factor

// returns resized image

mxArray *resize(const mxArray *mxsrc, const mxArray *mxscale) {

double *src = (double *)mxGetPr(mxsrc);

const int *sdims = mxGetDimensions(mxsrc);

if (mxGetNumberOfDimensions(mxsrc) != 3 ||

mxGetClassID(mxsrc) != mxDOUBLE_CLASS)

mexErrMsgTxt("Invalid input");

double scale = mxGetScalar(mxscale);

if (scale > 1)

mexErrMsgTxt("Invalid scaling factor");

int ddims[3];

ddims[0] = (int)round(sdims[0]*scale);

ddims[1] = (int)round(sdims[1]*scale);

ddims[2] = sdims[2];

mxArray *mxdst = mxCreateNumericArray(3, ddims, mxDOUBLE_CLASS, mxREAL);

double *dst = (double *)mxGetPr(mxdst);

double *tmp = (double *)mxCalloc(ddims[0]*sdims[1]*sdims[2], sizeof(double));

resize1dtran(src, sdims[0], tmp, ddims[0], sdims[1], sdims[2]);

resize1dtran(tmp, sdims[1], dst, ddims[1], ddims[0], sdims[2]);

mxFree(tmp);

return mxdst;

}

// matlab entry point

// dst = resize(src, scale)

// image should be color with double values

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) {

if (nrhs != 2)

mexErrMsgTxt("Wrong number of inputs");

if (nlhs != 1)

mexErrMsgTxt("Wrong number of outputs");

plhs[0] = resize(prhs[0], prhs[1]);

}

步骤4 修改dt.cpp文件

修改完resize.cpp文件后,继续compile,错误提示如下:

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dt.cpp(61): error C2065: 'int32_t' : undeclared identifier

等等。

为解决此问题,在dt.cpp文件前面加上:

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#defineint32_t int

然后继续compile,错误提示如下:

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dt.cpp(77): error C2374: 'x' : redefinition; multiple initialization

dt.cpp(70) : seedeclaration of 'x'

说明有变量的二次定义,其实这是VC++6.0编译器的一个bug,在VC++6.0中,如果有如下的语句:

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for(int i=0; i < 10; i++)

{...}

for(int i=0; i <10; i++)

{...}

则编译器会提示第二个变量i是重复定义,也就是说,编译器不认为在for语句内定义的变量的作用域仅限于for语句内,这与C++语法不符,现在的VS2010中已经没有这个问题了。所以在resize.cpp文件的对应位置注释掉二次定义就可以了,或者如果你选择的编译器不是VC++6.0的话,就没有这个问题。

步骤5 修改features.cpp文件

修改好dt.cpp文件后,再次compile,错误提示如下:

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features.cpp(48) : error C2065: 'round' : undeclared identifier

features.cpp(158) : error C2374: 'x' : redefinition; multiple initialization

features.cpp(65) : see declaration of 'x'

features.cpp(195) : error C2374: 'o' : redefinition; multiple initialization

features.cpp(179) : see declaration of 'o'

可以看出有三个问题,round()函数未定义,变量x和o重复定义,

所以在features.cpp文件中加入round()函数的定义:

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intround(float a){float tmp = a-(int)a; if(tmp>=0.5) return (int)a+1;elsereturn (int)a;}

并根据出错位置注释掉变量x和o的二次定义

步骤6 再次修改compile.m文件

修改完features.cpp文件后,再次compile,错误提示如下:

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Usage:

MEX [option1 ... optionN] sourcefile1 [... sourcefileN]

[objectfile1 ... objectfileN] [libraryfile1 ... libraryfileN]

Use the -help option for more information, or consult the MATLAB API Guide.

Error in ==> compile at 10

mex -O fconvsse.cc -o fconv

打开compile.m文件,查看第10行之前的注释:

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% use one of thefollowing depending on your setup

% 0 is fastest, 3 isslowest(应该是0 is fastest, 4 is slowest)

可以看到0-4只是效率不同,作用一样,既然第10行的0号出问题了,就换一个,根据网友pozen的说明:其他几个fconv用了其他平台的multiThread在windows上跑不起,所以在最后加上:

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mex -O fconv.cpp

并将第10行的

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mex -O fconvsse.cc -o fconv

注释掉。

注意这里要先将fconv.cc文件的扩展名改为cpp,否则还会出现一开始的不识别.cc文件的问题。

修改完后的compile.m文件如下:

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mex -O resize.cpp

mex -O dt.cpp

mex -O features.cpp

mex -O getdetections.cpp

% use one of the following depending on your setup

% 0 is fastest, 3 is slowest

% 0) multithreaded convolution using SSE

% mex -O fconvsse.cc -o fconv

% 1) multithreaded convolution using blas

% WARNING: the blas version does not work with matlab >= 2010b

% and Intel CPUs

% mex -O fconvblasMT.cc -lmwblas -o fconv

% 2) mulththreaded convolution without blas

% mex -O fconvMT.cc -o fconv

% 3) convolution using blas

% mex -O fconvblas.cc -lmwblas -o fconv

% 4) basic convolution, very compatible

% mex -O fconv.cc -o fconv

%在windows下使用时加上下面这句,并注释掉0)

mex -O fconv.cpp

步骤7 修改fconv.cpp文件

修改完compile.m文件后,再次compile,错误提示如下:

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fconv.cpp(75): error C4716: 'process' : must return a value

所以修改fconv.cpp文件,将

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void*process(void *thread_arg)

改为:

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void process(void*thread_arg)

即去掉指针符号。

然后再次compile,没错误提示了,编译成功了。

步骤8 运行demo(),进行目标检测试验

编译完成后,在matlab命令行中输入demo,进行目标检测试验,根据提示,依次会出现小轿车、人、自行车的部件模型和检测结果,如果想检测其他图片,修改demo文件即可。

结果

(1) 小轿车





(2) 人





(3) 自行车



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