cmake编译安装OpenCV

步骤过程：下载OpenCV源码包opencv-3.2.0.zip

解压后，查看文件夹opencv-3.2.0/3rdparty/ffmpeg

---cmake结束之后---在ffmpeg文件夹下，有如下内容：

该文件夹下没有ffmpeg.dll等动态链接库，在用cmake编译源码时，会下载ffmpeg.dll等库，所有要保持网络通畅。

——————configure过程

下载opencv_ffmpeg.dll的过程

下载完之后，安装

、

这时会在opencv的源码包里发现多了三个文件opencv_ffmpeg.dll opencv_ffmpeg_64.dl

在下载另一条的时候会失败的，错误提醒如下：

编译OpenCV3.2.0时，ffmpeg或ippcv下载不成功的解决方案可以通过手动配置来解决这类问题，当然也可以直接配置之后再编译，

下载地址为 opencv/opencv_3rdparty ，编译完成后结果为：

下载

解压文件夹下后，会看到以下文件夹，看到ippicv:

在文件夹ippicv下，会有分别在linux 、mac、win系统的三个压缩文件包，如下：

然后解压win的zip下：

然后将解压的该文件夹，存放在\ippicv，首先新建一个unpack的文件夹，

然后，将ippicv_win文件夹复制到unpack文件夹下。

然后，编辑downloader.cmake(首先将复制一份)，如下：

，然后编辑downloader.cmake，如下：

#
# 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()

，然后重新点击configure,