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FindOpenCV.cmake
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# - Try to find OpenCV library installation
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# See http://sourceforge.net/projects/opencvlibrary/
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#
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# The following variables are optionally searched for defaults
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#  OpenCV_ROOT_DIR:            Base directory of OpenCv tree to use.
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#  OpenCV_FIND_REQUIRED_COMPONENTS : FIND_PACKAGE(OpenCV COMPONENTS ..)
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#    compatible interface. typically  CV CXCORE CVAUX HIGHGUI CVCAM .. etc.
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#
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# The following are set after configuration is done:
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#  OpenCV_FOUND
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#  OpenCV_INCLUDE_DIR
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#  OpenCV_LIBRARIES
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#  OpenCV_LINK_DIRECTORIES
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#
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# deprecated:
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#  OPENCV_* uppercase replaced by case sensitive OpenCV_*
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#  OPENCV_EXE_LINKER_FLAGS
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#  OPENCV_INCLUDE_DIR : replaced by plural *_DIRS
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#
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# 2004/05 Jan Woetzel, Friso, Daniel Grest
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# 2006/01 complete rewrite by Jan Woetzel
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# 1006/09 2nd rewrite introducing ROOT_DIR and PATH_SUFFIXES
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#   to handle multiple installed versions gracefully by Jan Woetzel
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#
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# tested with:
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# -OpenCV 0.97 (beta5a):  MSVS 7.1, gcc 3.3, gcc 4.1
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# -OpenCV 0.99 (1.0rc1):  MSVS 7.1
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#
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# www.mip.informatik.uni-kiel.de/~jw
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# --------------------------------
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MACRO(DBG_MSG _MSG)
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  #  MESSAGE(STATUS "${CMAKE_CURRENT_LIST_FILE}(${CMAKE_CURRENT_LIST_LINE}):\n${_MSG}")
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ENDMACRO(DBG_MSG)
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# required cv components with header and library if COMPONENTS unspecified
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IF    (NOT OpenCV_FIND_COMPONENTS)
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  # default
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  SET(OpenCV_FIND_REQUIRED_COMPONENTS   CV CXCORE CVAUX HIGHGUI )
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  IF   (WIN32)
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    LIST(APPEND OpenCV_FIND_REQUIRED_COMPONENTS  CVCAM ) # WIN32 only actually
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  ENDIF(WIN32)
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ENDIF (NOT OpenCV_FIND_COMPONENTS)
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# typical root dirs of installations, exactly one of them is used
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SET (OpenCV_POSSIBLE_ROOT_DIRS
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  "${OpenCV_ROOT_DIR}"
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  "$ENV{OpenCV_ROOT_DIR}"
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  "$ENV{OPENCV_DIR}"  # only for backward compatibility deprecated by ROOT_DIR
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  "$ENV{OPENCV_HOME}" # only for backward compatibility
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  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Intel(R) Open Source Computer Vision Library_is1;Inno Setup: App Path]"
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  "$ENV{ProgramFiles}/OpenCV"
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  /usr/local
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  /usr
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  )
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# MIP Uni Kiel /opt/net network installation
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# get correct prefix for current gcc compiler version for gcc 3.x  4.x
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IF    (${CMAKE_COMPILER_IS_GNUCXX})
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  IF    (NOT OpenCV_FIND_QUIETLY)
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    MESSAGE(STATUS "Checking GNUCXX version 3/4 to determine  OpenCV /opt/net/ path")
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  ENDIF (NOT OpenCV_FIND_QUIETLY)
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  EXEC_PROGRAM(${CMAKE_CXX_COMPILER} ARGS --version OUTPUT_VARIABLE CXX_COMPILER_VERSION)
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  IF   (CXX_COMPILER_VERSION MATCHES ".*3\\.[0-9].*")
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    SET(IS_GNUCXX3 TRUE)
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    LIST(APPEND OpenCV_POSSIBLE_ROOT_DIRS /opt/net/gcc33/OpenCV )
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  ENDIF(CXX_COMPILER_VERSION MATCHES ".*3\\.[0-9].*")
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  IF   (CXX_COMPILER_VERSION MATCHES ".*4\\.[0-9].*")
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    SET(IS_GNUCXX4 TRUE)
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    LIST(APPEND OpenCV_POSSIBLE_ROOT_DIRS /opt/net/gcc41/OpenCV )
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  ENDIF(CXX_COMPILER_VERSION MATCHES ".*4\\.[0-9].*")
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ENDIF (${CMAKE_COMPILER_IS_GNUCXX})
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#DBG_MSG("DBG (OpenCV_POSSIBLE_ROOT_DIRS=${OpenCV_POSSIBLE_ROOT_DIRS}")
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#
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# select exactly ONE OpenCV base directory/tree
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# to avoid mixing different version headers and libs
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#
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FIND_PATH(OpenCV_ROOT_DIR
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  NAMES
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  cv/include/cv.h     # windows
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  include/opencv/cv.h # linux /opt/net
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  include/cv/cv.h
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  include/cv.h
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  PATHS ${OpenCV_POSSIBLE_ROOT_DIRS})
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DBG_MSG("OpenCV_ROOT_DIR=${OpenCV_ROOT_DIR}")
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# header include dir suffixes appended to OpenCV_ROOT_DIR
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SET(OpenCV_INCDIR_SUFFIXES
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  include
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  include/cv
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  include/opencv
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  cv/include
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  cxcore/include
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  cvaux/include
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  otherlibs/cvcam/include
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  otherlibs/highgui
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  otherlibs/highgui/include
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  otherlibs/_graphics/include
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  )
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# library linkdir suffixes appended to OpenCV_ROOT_DIR
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SET(OpenCV_LIBDIR_SUFFIXES
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  lib
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  OpenCV/lib
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  otherlibs/_graphics/lib
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  )
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#DBG_MSG("OpenCV_LIBDIR_SUFFIXES=${OpenCV_LIBDIR_SUFFIXES}")
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#
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# find incdir for each lib
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#
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FIND_PATH(OpenCV_CV_INCLUDE_DIR
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  NAMES cv.h
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES ${OpenCV_INCDIR_SUFFIXES} )
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FIND_PATH(OpenCV_CXCORE_INCLUDE_DIR
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  NAMES cxcore.h
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES ${OpenCV_INCDIR_SUFFIXES} )
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FIND_PATH(OpenCV_CVAUX_INCLUDE_DIR
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  NAMES cvaux.h
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES ${OpenCV_INCDIR_SUFFIXES} )
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FIND_PATH(OpenCV_HIGHGUI_INCLUDE_DIR
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  NAMES highgui.h
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES ${OpenCV_INCDIR_SUFFIXES} )
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FIND_PATH(OpenCV_CVCAM_INCLUDE_DIR
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  NAMES cvcam.h
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES ${OpenCV_INCDIR_SUFFIXES} )
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#
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# find sbsolute path to all libraries
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# some are optionally, some may not exist on Linux
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#
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FIND_LIBRARY(OpenCV_CV_LIBRARY
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  NAMES cv opencv
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  PATHS ${OpenCV_ROOT_DIR}
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  PATH_SUFFIXES  ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_CVAUX_LIBRARY
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  NAMES cvaux
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_CVCAM_LIBRARY
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  NAMES cvcam
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_CVHAARTRAINING_LIBRARY
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  NAMES cvhaartraining
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_CXCORE_LIBRARY
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  NAMES cxcore
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_CXTS_LIBRARY
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  NAMES cxts
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_HIGHGUI_LIBRARY
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  NAMES highgui
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_ML_LIBRARY
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  NAMES ml
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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FIND_LIBRARY(OpenCV_TRS_LIBRARY
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  NAMES trs
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  PATHS ${OpenCV_ROOT_DIR}  PATH_SUFFIXES ${OpenCV_LIBDIR_SUFFIXES} )
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#
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# Logic selecting required libs and headers
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#
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SET(OpenCV_FOUND ON)
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DBG_MSG("OpenCV_FIND_REQUIRED_COMPONENTS=${OpenCV_FIND_REQUIRED_COMPONENTS}")
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FOREACH(NAME ${OpenCV_FIND_REQUIRED_COMPONENTS} )
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  # only good if header and library both found
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  IF    (OpenCV_${NAME}_INCLUDE_DIR AND OpenCV_${NAME}_LIBRARY)
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    LIST(APPEND OpenCV_INCLUDE_DIRS ${OpenCV_${NAME}_INCLUDE_DIR} )
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    LIST(APPEND OpenCV_LIBRARIES    ${OpenCV_${NAME}_LIBRARY} )
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    #DBG_MSG("appending for NAME=${NAME} ${OpenCV_${NAME}_INCLUDE_DIR} and ${OpenCV_${NAME}_LIBRARY}" )
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  ELSE  (OpenCV_${NAME}_INCLUDE_DIR AND OpenCV_${NAME}_LIBRARY)
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    DBG_MSG("OpenCV component NAME=${NAME} not found! "
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      "\nOpenCV_${NAME}_INCLUDE_DIR=${OpenCV_${NAME}_INCLUDE_DIR} "
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      "\nOpenCV_${NAME}_LIBRARY=${OpenCV_${NAME}_LIBRARY} ")
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    SET(OpenCV_FOUND OFF)
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  ENDIF (OpenCV_${NAME}_INCLUDE_DIR AND OpenCV_${NAME}_LIBRARY)
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ENDFOREACH(NAME)
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DBG_MSG("OpenCV_INCLUDE_DIRS=${OpenCV_INCLUDE_DIRS}")
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DBG_MSG("OpenCV_LIBRARIES=${OpenCV_LIBRARIES}")
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# get the link directory for rpath to be used with LINK_DIRECTORIES:
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IF    (OpenCV_CV_LIBRARY)
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  GET_FILENAME_COMPONENT(OpenCV_LINK_DIRECTORIES ${OpenCV_CV_LIBRARY} PATH)
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ENDIF (OpenCV_CV_LIBRARY)
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MARK_AS_ADVANCED(
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  OpenCV_ROOT_DIR
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  OpenCV_INCLUDE_DIRS
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  OpenCV_CV_INCLUDE_DIR
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  OpenCV_CXCORE_INCLUDE_DIR
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  OpenCV_CVAUX_INCLUDE_DIR
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  OpenCV_CVCAM_INCLUDE_DIR
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  OpenCV_HIGHGUI_INCLUDE_DIR
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  OpenCV_LIBRARIES
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  OpenCV_CV_LIBRARY
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  OpenCV_CXCORE_LIBRARY
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  OpenCV_CVAUX_LIBRARY
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  OpenCV_CVCAM_LIBRARY
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  OpenCV_CVHAARTRAINING_LIBRARY
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  OpenCV_CXTS_LIBRARY
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  OpenCV_HIGHGUI_LIBRARY
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  OpenCV_ML_LIBRARY
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  OpenCV_TRS_LIBRARY
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  )
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# be backward compatible:
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SET(OPENCV_LIBRARIES   ${OpenCV_LIBRARIES} )
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SET(OPENCV_INCLUDE_DIR ${OpenCV_INCLUDE_DIRS} )
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SET(OPENCV_FOUND       ${OpenCV_FOUND})
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# display help message
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IF(NOT OpenCV_FOUND)
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  # make FIND_PACKAGE friendly
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  IF(NOT OpenCV_FIND_QUIETLY)
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    IF(OpenCV_FIND_REQUIRED)
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      MESSAGE(FATAL_ERROR
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        "OpenCV required but some headers or libs not found. Please specify it's location with OpenCV_ROOT_DIR env. variable.")
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    ELSE(OpenCV_FIND_REQUIRED)
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      MESSAGE(STATUS
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        "ERROR: OpenCV was not found.")
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    ENDIF(OpenCV_FIND_REQUIRED)
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  ENDIF(NOT OpenCV_FIND_QUIETLY)
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ENDIF(NOT OpenCV_FOUND)
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