OpenCV在ARM上的移植

與X86 Linux類似，請參考： Linux 下編譯安裝OpenCV 本文在此基礎上進行進一步操作。

網絡上很多移植編譯的方法比較老，多數針對OpenCV 1.0，而且方法很麻煩，不仔細操作很容易出錯，我的方法是盡可能的利用現成的工具，盡量圖形化界面配置操作，方便編譯配置。

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Linking CXX executable ../../bin/opencv_perf_core
../../lib/libopencv_highgui.so: undefined reference to `_TIFFmemcpy'
../../lib/libopencv_core.so: undefined reference to `pthread_spin_init'
../../lib/libopencv_core.so: undefined reference to `pthread_spin_unlock'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFmemset'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFwarningHandler'
../../lib/libopencv_core.so: undefined reference to `pthread_key_create'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFmemcmp'
../../lib/libopencv_core.so: undefined reference to `pthread_getspecific'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFfree'
../../lib/libopencv_ts.so: undefined reference to `pthread_key_delete'
../../lib/libopencv_core.so: undefined reference to `pthread_spin_lock'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFmalloc'
../../lib/libopencv_highgui.so: undefined reference to `TIFFOpen'
../../lib/libopencv_core.so: undefined reference to `pthread_spin_destroy'
../../lib/libopencv_core.so: undefined reference to `pthread_once'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFrealloc'
../../lib/libopencv_core.so: undefined reference to `clock_gettime'
../../lib/libopencv_core.so: undefined reference to `pthread_spin_trylock'
../../lib/libopencv_highgui.so: undefined reference to `_TIFFerrorHandler'
../../lib/libopencv_core.so: undefined reference to `pthread_setspecific'
collect2: ld returned 1 exit status
make[2]: *** [bin/opencv_perf_core] 錯誤 1
make[1]: *** [modules/core/CMakeFiles/opencv_perf_core.dir/all] 錯誤 2
make: *** [all] 錯誤 2

關於TIFF的報錯，是因為一開始我勾選了TIFF的支持，而這個支持是需要宿主機中安裝相應的程序的，所以報錯，可以打開cmake 去掉勾選。 其他報錯經過查找找到以下解釋：

編譯時發現如下錯誤：
Linking CXX executable ../../bin/opencv_createsamples
../../lib/libcxcore.so: undefined reference to `clock_gettime'
../../lib/libcxcore.so: undefined reference to `pthread_key_create'
../../lib/libcxcore.so: undefined reference to `pthread_getspecific'
../../lib/libcxcore.so: undefined reference to `pthread_setspecific'

原因是cmake不認識我定義的arm-linux系統標記，沒有加上庫pthread和rt的鏈接選項

此時需要修改CMakeCache.txt，CMAKE_EXE_LINKER_FLAGS原來為空，加上-lpthread -lrt

按照此方法更改對應文件，如下圖所示：

此處在CMakeCache.txt 的173行，添加-lpthread -lrt，然後繼續編譯。編譯過程十來分鐘左右，編譯成功結果如下：

運行make install進行安裝，在我的安裝目錄中就會多出以下幾個文件夾：

lib文件夾即生成的庫文件，拷貝到開發板對應目錄即可。