Opencv

※前提条件：本情報はUbentu 15.4を基づいて説明している

C/C++開発するため、Ubentu環境でOpenCVのライブラリをコンパイルする

準備： †

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基本：
sudo apt-get install build-essential

必須：
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

オプション：
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

Terminalから以下おコマンドを実行する

mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-master/modules ..
make
sudo make install

トラブルシューティング †

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ICV エラー †

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■現象
以下のようなICVエラーが発生

-- ICV: Downloading ippicv_linux_20151201.tgz...
CMake Error at 3rdparty/ippicv/downloader.cmake:73 (file):
  file DOWNLOAD HASH mismatch

    for file: [/home/xxxxx/opencv/opencv-master/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e/ippicv_linux_20151201.tgz]
      expected hash: [808b791a6eac9ed78d32a7666804320e]
        actual hash: [43f410e70865e2a75a1c58ecd13b0bb0]
             status: [28;"Timeout was reached"]

Call Stack (most recent call first):
  3rdparty/ippicv/downloader.cmake:110 (_icv_downloader)
  cmake/OpenCVFindIPP.cmake:237 (include)
  cmake/OpenCVFindLibsPerf.cmake:12 (include)
  CMakeLists.txt:539 (include)


CMake Error at 3rdparty/ippicv/downloader.cmake:77 (message):
  ICV: Failed to download ICV package: ippicv_linux_20151201.tgz.
  Status=28;"Timeout was reached"
Call Stack (most recent call first):
  3rdparty/ippicv/downloader.cmake:110 (_icv_downloader)
  cmake/OpenCVFindIPP.cmake:237 (include)
  cmake/OpenCVFindLibsPerf.cmake:12 (include)
  CMakeLists.txt:539 (include)


-- Configuring incomplete, errors occurred!

■対策：

以下のURLから必須コンポーネントをダウンロードする

https://raw.githubusercontent.com/Itseez/opencv_3rdparty/81a676001ca8075ada498583e4166079e5744668/ippicv/ippicv_linux_20151201.tgz

①ダウンロードしたファイルを以下のパスに格納する

opencv-master/3rdparty/ippicv/downloads/linux-808b791a6eac9ed78d32a7666804320e

②インストールにまた必要となる場合、エラー提示したように、以下ファイルを編集すること。
※簡単に修正するなら73〜85行を全部削除すればよい。

opencv-master/3rdparty/ippicv/downloader.cmake

    message(STATUS "ICV: Downloading ${OPENCV_ICV_PACKAGE_NAME}...")
#    file(DOWNLOAD "${OPENCV_ICV_URL}/${OPENCV_ICV_PACKAGE_NAME}" "${OPENCV_ICV_PACKAGE_ARCHIVE}"
#         TIMEOUT 600 STATUS __status
#         EXPECTED_MD5 ${OPENCV_ICV_PACKAGE_HASH})
#    if(NOT __status EQUAL 0)
#      message(FATAL_ERROR "ICV: Failed to download ICV package: ${OPENCV_ICV_PACKAGE_NAME}. Status=${__status}")
#    else()
#      # Don't remove this code, because EXPECTED_MD5 parameter doesn't fail "file(DOWNLOAD)" step
#      # on wrong hash
#      file(MD5 "${OPENCV_ICV_PACKAGE_ARCHIVE}" archive_md5)
#      if(NOT archive_md5 STREQUAL OPENCV_ICV_PACKAGE_HASH)
#        message(FATAL_ERROR "ICV: Downloaded copy of ICV package has invalid MD5 hash: ${archive_md5} (expected: ${OPENCV_ICV_PACKAGE_HASH})")
#      endif()
#    endif()
  endif()

Unknown CMake command "ocv_check_dependencies". †

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■現象
opencv_contrib-masterのModuleのサンプルのコンパイルに以下のエラーが発生

CMake Error at CMakeLists.txt:10 (ocv_check_dependencies):
 Unknown CMake command "ocv_check_dependencies".

■対策：

faceを例として説明する、以下のパス内でcmake .を

opencv_contrib-master/modules/face/samples

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