移植opencv3.20到3519步骤

1.移植环境：

Ubuntu15.10 + arm-hisiv500-linux-

opencv3.20 [下载地址]([url]http://opencv.org/downloads.html[/url])

2.移植步骤：

1）安装cmake-gui

        shunzhi@ubuntu:~/hisi$ sudo apt-get install cmake-gui

2）新建一个opencv目录存放opencv-3.2.0.zip，并解压
        shunzhi@ubuntu:~/hisi$ mkdir opencv  
        shunzhi@ubuntu:~/hisi$ ls  
        opencv  opencv-3.2.0.zip  
        shunzhi@ubuntu:~/hisi$ unzip opencv-3.2.0.zip -d opencv  
        shunzhi@ubuntu:~/hisi$ cd opencv  
        shunzhi@ubuntu:~/hisi/opencv$ mkidr build _install  
        shunzhi@ubuntu:~/hisi/opencv$ ls  
        build  opencv-3.2.0  _install  

3）配置opencv编译环境
        shunzhi@ubuntu:~/hisi/opencv/opencv-3.2.0$ ls  
        3rdparty  cmake           CONTRIBUTING.md  doc      LICENSE  platforms  samples  
        apps      CMakeLists.txt  data             include  modules  README.md  
        shunzhi@ubuntu:~/hisi/opencv/opencv-3.2.0$cmake-gui  

点击Browse Source选择~/hisi/opencv/opencv-3.2.0  

点击Browse Build选择~/hisi/opencv/build  

点击Configure  

此时出现的对话框选择最后一项：Specify options for cross-compiling  

点击NEXT  

Operating System填写 arm-hisiv500-linux  

C填写arm-hisiv500-linux-gcc  

C++填写arm-hisiv500-linux-g++  

点击finish，然后等待Configuration done  

然后在出现的列表中修改CMAKE_INSTALL_PREFIX为~/hisi/opencv/_install  

点击Generate  

等待Generation done  

之后关闭cmake软件。  

4）编译opencv
        shunzhi@ubuntu:~/hisi/opencv/build$make

编译中遇到的问题：  
        ../../lib/libopencv_core.so: undefined reference to `pthread_mutex_trylock'
        ../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_settype'
        ../../lib/libopencv_core.so: undefined reference to `dlsym'
        ../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_destroy'
        ../../lib/libopencv_imgcodecs.so: undefined reference to `pthread_create'
        ../../lib/libopencv_core.so: undefined reference to `pthread_mutexattr_init'
        ../../lib/libopencv_core.so: undefined reference to `dlopen'
        ../../lib/libopencv_imgcodecs.so: undefined reference to `pthread_join'
        collect2: error: ld returned 1 exit status
        modules/core/CMakeFiles/opencv_perf_core.dir/build.make:816: recipe for target 'bin/opencv_perf_core' failed
        make[2]: *** [bin/opencv_perf_core] Error 1
        CMakeFiles/Makefile2:1341: recipe for target 'modules/core/CMakeFiles/opencv_perf_core.dir/all' failed
        make[1]: *** [modules/core/CMakeFiles/opencv_perf_core.dir/all] Error 2
        Makefile:146: recipe for target 'all' failed
        make: *** [all] Error 2

问题原因：
        cmake不认识我定义的arm-hisiv500-linux系统标记，没有加上库pthread和rt的链接选项

解决方案：修改CMakeCache.txt文件192行处  
        //Flags used by the linker.
        CMAKE_EXE_LINKER_FLAGS:STRING= -lpthread -lrt

5）安装opencv
        shunzhi@ubuntu:~/hisi/opencv/build$make install  
        shunzhi@ubuntu:~/hisi/opencv/_install$ ls  
        bin  include  lib  LICENSE  share  

3.测试：

1）编译测试程序
        shunzhi@ubuntu:~/hisi/opencv$ pwd
        /home/shunzhi/hisi/opencv
        shunzhi@ubuntu:~/hisi/opencv$ ls
        build  _install  opencv-3.2.0  test
        shunzhi@ubuntu:~/hisi/opencv$ cd test/
        shunzhi@ubuntu:~/hisi/opencv/test$ ls
        Makefile  opencv_hisi.c
        shunzhi@ubuntu:~/hisi/opencv/test$ make
        [Compiling] opencv_hisi.c ...
        shunzhi@ubuntu:~/hisi/opencv/test$ ls
        Makefile  opencv_hisi  opencv_hisi.c  opencv_hisi.o
        shunzhi@ubuntu:~/hisi/opencv/test$

2）测试程序

opencv_hisi.c
[code]#include
        #include
        #include

Makefile:
[code]CC = arm-hisiv500-linux-g++
DEMOTAR = opencv_hisi
DEMOOBJ = opencv_hisi.o
CFLAGS += -g -Wall -I$(shell pwd)/../_install/include
LDFLAGS += -L$(shell pwd)/../_install/lib -Wl,-Bdynamic -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_imgcodecs -lpthread -lrt
%.o: %.c
        @echo "[Compiling] $< ..."
        @$(CC) $(CFLAGS) -c $<
all: $(DEMOTAR)
$(DEMOTAR):$(DEMOOBJ)
        @$(CC) -o $@ $^ $(LDFLAGS)
.PHONY : clean
        clean:
        rm -rf $(DEMOOBJ) $(DEMOTAR)[/code]

4.测试结果

1）将opencv库拷贝到3519的开发板/usr/lib目录下。
        /usr/lib # ls
        libopencv_calib3d.so     libopencv_imgproc.so     libopencv_superres.so
        libopencv_core.so        libopencv_ml.so          libopencv_video.so
        libopencv_features2d.so  libopencv_objdetect.so   libopencv_videoio.so
        libopencv_flann.so       libopencv_photo.so       libopencv_videostab.so
        libopencv_highgui.so     libopencv_shape.so
        libopencv_imgcodecs.so   libopencv_stitching.so

2）开发板执行测试程序

        /mnt # ./opencv_hisi lena.jpg lena_test.jpg

注：

1）测试程序功能是将彩色图片转化为灰色图片（彩转灰）。  

2）lean.jpg文件在 ```opencv/opencv-3.2.0/samples/data/lena.jpg``` 位置。[postbg]bg4.png[/postbg]