------【2017.07.14 更新】-------------------------------------------------------

安裝opencv3每次cmake都要下載3rdparty，下載很慢還總失敗。附上自行下載連結及解決辦法：

opencv3.2也可以去官網下載。

先解壓縮opencv3.2

cd opencv-3.2.0/3rdparty/ippicv
mkdir unpack

將解壓後的目錄mv到unpack目錄中

替換ippicv目錄中downloader.cmake檔案內容為：

#
# The script downloads ICV package
#
# On return this will define:
# OPENCV_ICV_PATH - path to unpacked downloaded package
#

function(_icv_downloader)
  # Commit SHA in the opencv_3rdparty repo
  set(IPPICV_BINARIES_COMMIT "81a676001ca8075ada498583e4166079e5744668")
  # Define actual ICV versions
  if(APPLE)
    set(OPENCV_ICV_PACKAGE_NAME "ippicv_macosx_20151201.tgz")
    set(OPENCV_ICV_PACKAGE_HASH "4ff1fde9a7cfdfe7250bfcd8334e0f2f")
    set(OPENCV_ICV_PLATFORM "macosx")
    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_osx")
  elseif(UNIX)
    if(ANDROID AND NOT (ANDROID_ABI STREQUAL x86 OR ANDROID_ABI STREQUAL x86_64))
      return()
    endif()
    set(OPENCV_ICV_PACKAGE_NAME "ippicv_linux_20151201.tgz")
    set(OPENCV_ICV_PACKAGE_HASH "808b791a6eac9ed78d32a7666804320e")
    set(OPENCV_ICV_PLATFORM "linux")
    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_lnx")
  elseif(WIN32 AND NOT ARM)
    set(OPENCV_ICV_PACKAGE_NAME "ippicv_windows_20151201.zip")
    set(OPENCV_ICV_PACKAGE_HASH "04e81ce5d0e329c3fbc606ae32cad44d")
    set(OPENCV_ICV_PLATFORM "windows")
    set(OPENCV_ICV_PACKAGE_SUBDIR "/ippicv_win")
  else()
    return() # Not supported
  endif()

  set(OPENCV_ICV_UNPACK_PATH "${CMAKE_CURRENT_LIST_DIR}/unpack")
  set(OPENCV_ICV_PATH "${OPENCV_ICV_UNPACK_PATH}${OPENCV_ICV_PACKAGE_SUBDIR}")

  message(STATUS "ICV: Package successfully downloaded")
  set(OPENCV_ICV_PATH "${OPENCV_ICV_PATH}" PARENT_SCOPE)
endfunction()

_icv_downloader()
 

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提示錯誤：

cv2.error: /io/opencv/modules/highgui/src/window.cpp:583: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvShowImage

這個問題真是。。RLGL。。。

依賴包我就不說了，安裝好就是了。特別是libgtk2.0-dev和pkg-config。

簡單說一下怎麼手動安裝opencv2吧

先去官網http://opencv.org/

點release

下載opencv-2.4.13的source原始碼包

unzip opencv-2.4.13.zip
cd opencv-2.4.13/
cmake -DWITH_GTK=ON -DCMAKE_INSTALL_PREFIX=/usr/local .
make
sudo make install

這時候找cv2.so

可能在/usr/local/lib/python2.7/site-packages/ 目錄裡

也可能在/usr/local/lib/python2.7/dist-packages/ 目錄裡

第一種情況將cv2.so複製到/usr/lib/python2.7/site-packages/目錄裡

第二種情況複製到/usr/lib/python2.7/dist-packages/目錄裡

好了！！！最坑爹的來了，正常這樣操作後就沒問題了啊。

如果你執行程式碼不再提示錯誤可以無視下面的內容。

還出問題的小夥伴們看一看/usr/local/lib/python2.7/site-packages/或者/usr/local/lib/python2.7/dist-packages/目錄下是不是有個名字為cv2的資料夾

刪掉它！問題就解決了。

來來回回重新安裝了一下午的opencv，崩潰的要死！