OpenCV linux cmake添加使用

安装好opencv之后：

只需要添加一下，就可以方便的使用opencv了，find_package opencv 会寻找FindOpenCV.cmake

find_package(OpenCV 2.4.8 REQUIRED)
if(OpenCV_FOUND)
    message(STATUS "---------------- OPENCV_INCLUDE_DIRS: ${OPENCV_INCLUDE_DIRS}")
    include_directories(${OPENCV_INCLUDE_DIRS})
    link_directories(${OPENCV_LIBRARY_DIRS})
    add_definitions(${OPENCV_DEFINITIONS})
else()
    message(FATAL_ERROR "-------------------OpenCV not found")
endif()

set(TEST_SRC ./test/test.cpp)

ADD_EXECUTABLE(test ${TEST_SRC})
TARGET_LINK_LIBRARIES(test ${OpenCV_LIBS})  #link the opencv libraries