我正在尝试使用以下命令编译 OpenCV 3.2：
1.
cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=/usr/local/ -DOPENCV_EXTRA_MODULES_PATH=/home/matteo/Desktop/Xilinx/OpenCV/source/opencv_contrib/modules/ /home/matteo/Desktop/Xilinx/OpenCV/source/opencv-3.2.0/
2.
make -j7 # runs 7 jobs in parallel
3.
sudo make install
你能解释一下为什么我得到
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-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
-- Caffe: NO
-- Protobuf: NO
-- Glog: NO
-- Downloading ...
CMake Error at cmake/OpenCVUtils.cmake:1043 (file):
file DOWNLOAD cannot open file for write.
Call Stack (most recent call first):
../opencv_contrib/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download)
../opencv_contrib/modules/dnn/CMakeLists.txt:5 (include)
CMake Error at cmake/OpenCVUtils.cmake:1047 (message):
Failed to download . Status=
Call Stack (most recent call first):
../opencv_contrib/modules/dnn/cmake/OpenCVFindLibProtobuf.cmake:32 (ocv_download)
../opencv_contrib/modules/dnn/CMakeLists.txt:5 (include)
-- Configuring incomplete, errors occurred!
我正在使用 Ubuntu 16.04 。我的系统上已经安装了 OpenCV：也许我以错误的方式卸载了它？我记得用上面使用的相同命令编译 OpenCV 3.2。
您必须拥有 opencv_contrib 和 opencv 本身的匹配版本。
在opencv github下，进入OpenCV 版本 https://github.com/opencv/opencv/releases并下载3.2.0（在master分支中应该是相同的）。
现在，前往https://github.com/opencv/opencv_contrib/releases https://github.com/opencv/opencv_contrib/releases并下载 3.2.0。然后您将获得两个匹配的版本。
之后，在 opencv_contrib 主分支的 README.md 上找到的所有 cmake 命令应该可以正常工作。
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