试玩dlib人脸识别

一、Ubuntu端试玩dlib

源码下载：

wget http://dlib.net/files/dlib-19.18.tar.bz2

使用cmake进行编译。

1.1 编译gcc版本dlib

1. unzip dlib-19.18.zip
2. cd dlib-19.18/
3. mkdir build
4. cd build
5. cmake ..
6. make -j 8 release=1

编译成功

[100%] Linking CXX static library libdlib.a
[100%] Built target dlib

1.2 编译example

1. cd examples
2. mkdir build
3. cd build
4. cmake ..
5. cmake --build . --config Release

后续编译只需要修改代码，然后直接make -j 8
但是感觉速度也不是很快，链接比较耗时间。

1.3 微软ResNet模型与特征提取模型下载

下载地址：

wget http://dlib.net/files/shape_predictor_5_face_landmarks.dat.bz2

wget http://dlib.net/files/shape_predictor_68_face_landmarks.dat.bz2

wget http://dlib.net/files/dlib_face_recognition_resnet_model_v1.dat.bz2

bz2后缀文件解压命令

bzip2 -d shape_predictor_5_face_landmarks.dat.bz2

参考 https://blog.csdn.net/changkaibo/article/details/80091816

1.4 简单实例试玩

dnn_face_recognition_ex 人脸检测还支持人脸对齐。

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face_landmark_detection_ex

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二、cmake交叉编译dlib

终端命令行进入build目录后，执行cmake-gui进行配置。

2.1 cmake-gui配置

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设置好源码路径与交叉编译器路径后点击configure、generate。最后关闭cmake-gui，执行make -j 8即可编译。

出现错误：

Using CMake version: 3.5.1
Compiling dlib version: 19.18.0
CMake Error at dlib/cmake_utils/set_compiler_specific_options.cmake:50 (message):
  C++11 is required to use dlib, but the version of GCC you are using is too
  old and doesn't support C++11.  You need GCC 4.8 or newer.
Call Stack (most recent call first):
  dlib/CMakeLists.txt:30 (include)

原先的交叉编译器版本：
arm-hisiv100nptl-linux-gcc (Hisilicon_v100(gcc4.4-290+uclibc_0.9.32.1+eabi+linuxpthread)) 4.4.1 不支持c++11。

解决办法：

使用高版本编译器
arm-hisiv300-linux-gcc (Hisilicon_v300) 4.8.3 20131202 (prerelease)
Copyright (C) 2013 Free Software Foundation, Inc.

2.2 交叉编译dlib静态库出现错误

错误1：

/home/workspace/project/EC20/my_git_bak/TestRepo/cwr/face/demo/arm_cross_dlib/dlib-19.18/dlib/bigint/../serialize.h:1635:25: error: ‘to_string’ is not a member of ‘std’
                         std::to_string(objects_read+1) + "th object from the file " + filename +
                         ^
make[2]: *** [dlib/CMakeFiles/dlib.dir/bigint/bigint_kernel_1.cpp.obj] Error 1
make[1]: *** [dlib/CMakeFiles/dlib.dir/all] Error 2

解决办法：

在dlib根目录CMakeLists.txt 添加add_compile_options(-D_GLIBCXX_USE_C99)

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错误2：

/home/workspace/project/EC20/my_git_bak/TestRepo/cwr/face/demo/arm_cross_dlib/dlib-19.18/dlib/data_io/../geometry/rectangle.h:658:24: error: ‘round’ is not a member of ‘std’
         long l = (long)std::round(rect.left()*scale);

解决办法：

由于海思编译器对c++11支持不是很友好，在dlib/geometry/rectangle.h中修改，重新声明个round。

namespace std
{
    double round(double f);
    float erfc(float f);
}

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编译成功

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2.3 交叉编译example出现的错误

在example目录下创建arm_build

进入arm_build 使用camke-gui来进行设置交叉编译器

cmake-gui配置内容，只设置好example源码路径和arm_build目录，设置好CMAKE_INSTALL_PREFIX路径，其他默认就好。

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出现与编译libdlib.a静态库一样的错误。

[  3%] Building CXX object dlib_build/CMakeFiles/dlib.dir/entropy_decoder/entropy_decoder_kernel_2.cpp.obj
In file included from /home/workspace/test/tmp/dlib-19.18/dlib/bigint/bigint_kernel_1.h:8:0,
                 from /home/workspace/test/tmp/dlib-19.18/dlib/bigint/bigint_kernel_1.cpp:5:
/home/workspace/test/tmp/dlib-19.18/dlib/bigint/../serialize.h: In member function ‘dlib::proxy_deserialize& dlib::proxy_deserialize::doit(T&&)’:
/home/workspace/test/tmp/dlib-19.18/dlib/bigint/../serialize.h:1635:25: error: ‘to_string’ is not a member of ‘std’
                         std::to_string(objects_read+1) + "th object from the file " + filename +

参考静态库编译错误的解决办法，只不过修改的CMakeLists.txt是在example目录下的.

image

出现新的问题：

[ 49%] Linking CXX executable threads_ex
dlib_build/libdlib.a(threads_kernel_2.cpp.obj): In function `dlib::threads_kernel_shared_helpers::thread_starter(void*)':
threads_kernel_2.cpp:(.text+0x14): undefined reference to `pthread_detach'
dlib_build/libdlib.a(threads_kernel_2.cpp.obj): In function `dlib::threads_kernel_shared_helpers::spawn_thread(void (*)(void*), void*)':
threads_kernel_2.cpp:(.text+0x58): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
make[2]: *** [timer_ex] Error 1
make[1]: *** [CMakeFiles/timer_ex.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

解决办法：

在arm_build的目录下修改CMakeCache.txt文件
在/CXX compiler与C compiler下添加-lpthread选项。

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参考：
ubuntu14.04 + dlib19.2 - https://www.jianshu.com/p/653967b87031