摘要：
前提:版本为4.4.0下载地址：https://github.com/opencv/opencv/releaseswindows下载.exe安装之后复制2个文件:buildjavaopencv-440.jar,buildjavax64opencv_java440.dll调用列子如下://windows版本URLurl=ClassLoader.getSystemResource("lib/openc
前提: 版本为4.4.0
下载地址：https://github.com/opencv/opencv/releases
windows 下载.exe 安装之后
复制2个文件: buildjavaopencv-440.jar, buildjavax64opencv_java440.dll
调用列子如下:
//windows 版本 URL url = ClassLoader.getSystemResource("lib/opencv_java440.dll"); logger.info("动态库:" +url.getPath()); System.load(url.getPath()); //读取图像 Mat img = imread("E:\TEST\opencv\before.png", Imgcodecs.IMREAD_GRAYSCALE); Mat new_img = newMat(); Core.bitwise_not(img, new_img); Imgproc.blur(new_img, img, new Size(3, 3)); Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size(3, 3)); Imgproc.dilate(img, new_img, kernel); Imgproc.erode(new_img, img, kernel); Core.bitwise_not(img, new_img); Imgcodecs.imwrite("E:\TEST\opencv\after.png", new_img);
linux
1:wget下载 opencv文件
参考:https://www.jianshu.com/p/744269985eea
下载解压
wget https://github.com/opencv/opencv/archive/4.4.0.zip
unzip 4.4.0.tar.gz
进入目录
cd opencv-4.4.0
创建build目录 并进入
mkdir build && cd build
设置make参数 前提已经安装cmake(可参考最下面).
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
make install
生成jar
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -DBUILD_TESTS=OFF ..
make -j8
make install
此时2个文件： build/bin/opencv-java440.jar build/lib/libopencv_java440.so
注意，此Linux生产的opencv-440.jar 和windows安装产生的opencv-java440.jar一样
提示目前的cmake版本过低 cmake 版本升
cmake时报错： CMake 3.8 or higher is required. You are running version 3.5.1
参考:https://www.cnblogs.com/jsdy/p/12689470.html
1: cmake 升级
1. 查看当前cmake版本：
cmake -version
2. 卸载当前cmake：（如果安装了ROS跳过此步）
yum remove cmake
3. 下载cmake:
可直接从cmake官网下载新版本，也可执行如下语句：
wget http://www.cmake.org/files/v3.16/cmake-3.16.6.tar.gz
安装cmake前 , 否则./bootstrap 提示g++ Nopackage
yum -y install gcc-c++ openssl-devel
若提示错误
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder inthe system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR) CMake Error at Utilities/cmcurl/CMakeLists.txt:454(message): Could not find OpenSSL. Install an OpenSSL development package or configure CMake with -DCMAKE_USE_OPENSSL=OFF to build without OpenSSL. -- Configuring incomplete, errors occurred!See also "/root/soft/cmake-3.16.6/CMakeFiles/CMakeOutput.log". See also "/root/soft/cmake-3.16.6/CMakeFiles/CMakeError.log". ---------------------------------------------Error when bootstrapping CMake: Problem while running initial CMake
执行安装
yum install openssl-devel