OpenCV -- Android 环境搭建

OpenCV 是一个开源的计算机视觉库，可以从 opencv.org 获取。 它是跨平台的，可以运行在Linux、Windows、Android和Mac OS操作系统上。可以应用在以下多种领域 1.人机互动 2.物体识别 3.图像分割 4. 人脸识别 5.动作识别 6. 运动跟踪 7.机器人 8.运动分析 9.机器视觉 10.结构分析 11.汽车安全驾驶

在Android Studio中配置OpenCV

1.从 opencv.org/releases/ 中下载 Android版本

2.在Android Studio中新建包含NDK的Android项目

3. 将下载好的OpenCV-Android 文件进行解压，解压后的文件为

4.将OpenCV 动态库

放入到建立的Android 工程中的libs目录

5.将OpenCV 头文件

放入到建立的Android工程中创建的CPP目录下

6.修改 CMakeList######

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.10.2)

# Declares and names the project.

project("opencv")

#该变量为真时会创建完整版本的Makefile
set(CMAKE_VERBOSE_MAKEFILE on)

#定义变量ocvlibs使后面的命令可以使用定位具体的库文件
set(opencvlibs ${CMAKE_CURRENT_SOURCE_DIR}/../../../libs)

#调用头文件的具体路径
include_directories(${CMAKE_CURRENT_SOURCE_DIR})

#增加我们的动态库
add_library(libopencv_java45 SHARED IMPORTED)

#建立链接
set_target_properties(libopencv_java45 PROPERTIES IMPORTED_LOCATION
        "${opencvlibs}/${ANDROID_ABI}/libopencv_java4.so")


# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

file(GLOB native_srcs "*.cpp")

add_library( # Sets the name of the library.
        opencv-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        ${native_srcs})

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
        opencv-lib
        jnigraphics
        libopencv_java45

        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

7.修改app中的build.gradle文件为

用此种方式后就不必这只 jniLibs，至此配置完成，接下来就可以愉快的写代码了。