@u4/opencv-build

npm-opencv-build

A simple script to auto build recent OpenCV + contrib version via npm. This script is used to auto build opencv4nodejs.

Changes in this fork

• OpenCV build is not triggered by npm install but by new OpenCVBuilder().install()
• OpenCV build can now be configured with new OpenCVBuilder(new OpenCVBuildEnv({version: "3.4.16", autoBuildBuildCuda: true, autoBuildWithoutContrib: false, })).install()
• Each OPENCV_VERSION will be build in his own directory.
• Each AUTOBUILD_FLAGS will be build in his own directory. (induce massive time gain during development)
• if MSBuild.exe localisation for VS 2019
• Script output is now colorized.
• Add some usefull log.
• Big code refactor.
• Enfoce typing.
• Add comments and documentations.

Install

npm install opencv-build

Requirements

• cmake

Windows

for old nodejs

npm install --global windows-build-tools

Environment Variables

It's possible to specify build environment variables by inserting them into the package.json where the dependency is declared an object like:

{
  "opencv4nodejs": {
    "autoBuildFlags": "-DOPENCV_GENERATE_PKGCONFIG=ON -DOPENCV_PC_FILE_NAME=opencv.pc",
    "autoBuildOpencvVersion": "4.5.4"
  }
}

The following opencv4nodejs parameters can be passed:

autoBuildBuildCuda

Can be set using the environment variables OPENCV4NODEJS_BUILD_CUDA

set any value to enable, the following cMake flag will be added:

• DWITH_CUDA=ON
• DBUILD_opencv_cudacodec=OFF // video codec (NVCUVID) is deprecated in cuda 10, so don't add it
• DCUDA_FAST_MATH=ON // optional
• DWITH_CUBLAS=ON // optional

autoBuildFlags

Can be set using the environment variables OPENCV4NODEJS_AUTOBUILD_FLAGS

Append option to CMake flags.

autoBuildOpencvVersion

Can be set using the environment variables OPENCV4NODEJS_AUTOBUILD_OPENCV_VERSION

Choose the openCV version you want to build default value is 3.4.16.

autoBuildWithoutContrib

Can be set using the environment variables OPENCV4NODEJS_AUTOBUILD_WITHOUT_CONTRIB

Set any value to enable, this option will skip openCV Contribs.

disableAutoBuild

Can be set using the environment variables OPENCV4NODEJS_DISABLE_AUTOBUILD

Set any value to disable compilation from sources.

opencvIncludeDir

Over write the OPENCV_INCLUDE_DIR environment variables

opencvLibDir

Over write the OPENCV_LIB_DIR environment variables

opencvBinDir

Over write the OPENCV_BIN_DIR environment variables

build test

OPENCV4NODEJS_AUTOBUILD_FLAGS=-DBUILD_LIST=core,imgproc,imgcodecs,videoio,highgui,video,calib3d,features2d,objdetect,dnn,ml,flann,photo,stitching,gapi
npm run build && OPENCV4NODEJS_AUTOBUILD_OPENCV_VERSION=3.4.15 OPENCV4NODEJS_AUTOBUILD_WITHOUT_CONTRIB=1 npm run do-install

npm run build && OPENCV4NODEJS_AUTOBUILD_OPENCV_VERSION=4.5.4 OPENCV4NODEJS_AUTOBUILD_WITHOUT_CONTRIB=1 npm run do-install