在win和android上同时进行OpenCV程序设计

这里仅以widget为例，如果使用qtquick是一样的。具体以下几步：

1、项目创建的时候，选择android和desktop两类（前提是安装的时候已经都选择了）

这样，在程序设计的过程中，我们就可以通过切换来进行选择

如果对于已经配置好kti（构建套件）的项目，可以先删除目录下的.pro.user文件，而后重新打开项目，则自动跳出构建套件配置界面

2、配置文件：

对配置文件的修改是主要知识点所在，首先在不同平台下，要填写不同的前缀。对于pc平台是

​​ win32 {……} ​​

对于Android平台是

​​ android {……} ​​

大小写不可写错，此外就是OpenCV基础环境的配置。对于pc平台需要做的是配置系统路径、设置include和lib路径；对于Android平台需要做的是 设置include和lib路径，并且将 libopencv_java3.so 拷贝到最后的.apk中去。参考的配置文件如下，其中重要的部分已经加粗。

​​QT         +=         quick        
QT         +=         multimedia        
CONFIG         +=         c        ++
        11
        

win32 {
message("当前使用PC配置")
WIN32_OPENCV = D:/JsxyheluOpenCV/New-QT-dll/install
INCLUDEPATH += \
$$WIN32_OPENCV/include/opencv \
$$WIN32_OPENCV/include/opencv2 \
$$WIN32_OPENCV/include
LIBS += \
$$WIN32_OPENCV/x86/mingw/lib/
        libopencv_core320.dll.a
        \​​

​​       $$WIN32_OPENCV/x86/mingw/lib/libopencv_highgui320.dll.a\
$$WIN32_OPENCV/x86/mingw/lib/libopencv_imgproc320.dll.a\
$$WIN32_OPENCV/x86/mingw/lib/libopencv_imgcodecs320.dll.a\
$$WIN32_OPENCV/x86/mingw/lib/libopencv_highgui320.dll.a\
$$WIN32_OPENCV/x86/mingw/lib/libopencv_videoio320.dll.a
}
       
android {
message("当前使用Android配置")
ANDROID_OPENCV = D:/OpenCV-android-sdk/sdk/native
INCLUDEPATH += \
$$ANDROID_OPENCV/jni/include/opencv \
$$ANDROID_OPENCV/jni/include/opencv2 \
$$ANDROID_OPENCV/jni/include \
LIBS += \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_ml.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_objdetect.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_calib3d.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_video.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_features2d.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_highgui.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_flann.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_imgproc.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_core.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/liblibjpeg.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/liblibpng.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/liblibtiff.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/liblibjasper.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/libtbb.a \
$$ANDROID_OPENCV/3rdparty/libs/armeabi-v7a/libtegra_hal.a \
$$ANDROID_OPENCV/libs/armeabi-v7a/libopencv_java3.so
}

        
# The following         define makes your compiler emit warnings         if you use        
# any feature of Qt which as been marked deprecated (the exact warnings        
# depend on your compiler). Please consult the documentation of the        
# deprecated API in order to know how to port your code away from it.        
DEFINES         += QT_DEPRECATED_WARNINGS        

# You can also make your code fail to compile         if you use deprecated APIs.        
# In order to         do so, uncomment the following line.        
# You can also select to disable deprecated APIs only up to a certain version of Qt.        
#DEFINES         += QT_DISABLE_DEPRECATED_BEFORE        =0x060000 # disables all the APIs deprecated before Qt         6.
        0.
        0
        

SOURCES         += main.cpp \        
todocpp.cpp \        
calibration.cpp        

RESOURCES         += qml.qrc        

# Additional import path used to resolve QML modules in Qt Creator's code model        
QML_IMPORT_PATH =        

# Additional import path used to resolve QML modules just for Qt Quick Designer        
QML_DESIGNER_IMPORT_PATH =        

# Default rules for deployment.        
qnx: target.path = /tmp/$${TARGET}/bin        
else: unix:!android: target.path = /opt/$${TARGET}/bin        
!isEmpty(target.path): INSTALLS += target        

HEADERS += \        
todocpp.h \        
calibration.h        

DISTFILES += \        
android/AndroidManifest.xml \        
android/gradle/wrapper/gradle-wrapper.jar \        
android/gradlew \        
android/res/values/libs.xml \        
android/build.gradle \        
android/gradle/wrapper/gradle-wrapper.properties \        
android/gradlew.bat         

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
ANDROID_EXTRA_LIBS = \
D:/OpenCV-android-sdk/sdk/native/libs/armeabi-v7a/libopencv_java3.so
}
        
ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android       ​​

并设置正确的环境变量（如何在Windows和Android平台下编译OpenCV请参考博客中其它博文）

3、编写界面和代码

为说明方便，在简单的widget上面显示一个自己生成的圆。其中圆的生成和最终显示都调用OpenCV代码。那么如果这个是成功的，则证明OpenCV环境配置正确。

​​include        "mainwindow.h"       
#       include        "ui_mainwindow.h"       
using        namespace cv;       
Mat tmp;       
MainWindow       :       :MainWindow(QWidget        *parent) 
       :
       
    QMainWindow(parent),       
    ui(       new Ui       :       :MainWindow)       
{       
    ui       -       >setupUi(       this);       
}       

MainWindow       :       :       ~MainWindow()
       
{       
           delete ui;       
}       

void MainWindow       :       :on_pushButton_pressed()       
{       
    Mat src(Size(       640,       480),CV_8UC1,cv       :
       :Scalar(
       255));
       
    circle(src,Point(       100,       100),       100,Scalar(
       0),
       -
       1);
       
           // 格式转换       
    QPixmap qpixmap        = Mat2QImage(src);       
           // 将图片显示到label上       
    ui       -       >label       -
       >setPixmap(qpixmap);
       
}       

//格式转换       
QPixmap Mat2QImage(Mat src)       
{       
    QImage img;       
           //根据QT的显示方法进行转换       
           if(src.channels()        ==        3)       
    {       
        cvtColor( src, tmp, CV_BGR2RGB );       
        img        = QImage( (       const        unsigned        char
       *)(tmp.data), tmp.cols, tmp.rows, QImage
       :
       :Format_RGB888 );
       
    }       
           else
       
    {       
        img        = QImage( (       const        unsigned        char
       *)(src.data), src.cols, src.rows, QImage
       :
       :Format_Grayscale8 );
       
    }       
    QPixmap qimg        = QPixmap       :       :fromImage(img) ;
       
           return qimg;       
}       

​​

4、结果和小结

在两类平台上进行配置，其原始原因是为了能够加快项目初期，Android+OpenCV处理程序的调试速度，主要的难点在于.pro文件的配置。

在项目实践过程中的如何提高实现速度？我们在后面的文章中继续分享。

感谢阅读至此，希望有所帮助！