在Android 上运行 openCV ,并做灰度变化的一个例子

OpenCVImageProcessing
1. 导入Opencv的 androrid SDK
灰度算法 OpenCVImageProcessing

导入opencv Jar包，配置OpenCVLibrary340 的 bulid.gradle ， 配置Module：app 的 build.gradle , 在依赖里添加 implementation fileTree(dir: “$buildDir/native-libs”, include: ‘native-libs.jar’)

在Gradle Scripts 里修改 dependencies

​

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation project(':openCVLibrary340')
}

task nativeLibsToJar(type: Jar, description: 'create a jar archive of the native libs') {
destinationDir file("$buildDir/native-libs")
baseName 'native-libs'
from fileTree(dir: 'libs', include: '**/*.so')
into 'lib/'
}

tasks.withType(JavaCompile) {
compileTask -> compileTask.dependsOn(nativeLibsToJar)
}
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2. 灰度算法

@Override
public void onClick(View v) {
convert2Gray();
}

private void convert2Gray() {
Mat src = new Mat();
Mat temp = new Mat();
Mat dst = new Mat();
Bitmap image = BitmapFactory.decodeResource(this.getResources(),R.drawable.tantuo);
Utils.bitmapToMat(image,src);
Imgproc.cvtColor(src, temp , Imgproc.COLOR_RGBA2BGR);
Log.i( "CV", "image type:" + (temp.type() == CvType.CV_8UC3));
Imgproc.cvtColor(temp, dst, Imgproc.COLOR_BGR2GRAY);
Utils.matToBitmap(dst,image);
ImageView imageView = (ImageView) findViewById(R.id.imageView);
imageView.setImageBitmap(image);

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点击按钮，Imgproc.cvtColor(src, temp , Imgproc.COLOR_RGBA2BGR) 执行结果如下：
（现在总是加班坐着胖得厉害，两年前的时候经常帅得睡不着觉的）

https://img-blog.csdnimg.cn/2019052117390814.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNzczNDk4OA==,size_16,color_FFFFFF,t_70

https://img-blog.csdnimg.cn/20190521173707608.jpeg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zNzczNDk4OA==,size_16,color_FFFFFF,t_70
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