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')
1
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)

}

1. 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);
   
   

点击按钮，Imgproc.cvtColor(src, temp , Imgproc.COLOR_RGBA2BGR)

作者：谭妥
来源：CSDN
原文：https://blog.csdn.net/weixin_37734988/article/details/90411605
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