Android调用OpenCV2.4.10实现二维码区域定位

概述Android上使调用OpenCV2.4.10实现二维码区域定位（Z-xing码），该文章主要用于笔者自己学习中的总结，暂贴出代码部分，待以后有时间再补充算法的详细细节。

AndroID上使调用OpenCV 2.4.10 实现二维码区域定位（Z-xing 码），该文章主要用于笔者自己学习中的总结，暂贴出代码部分，待以后有时间再补充算法的详细细节。

Activity class Java 文件

package cn.hjq.androID_capture;  import java.io.BuffereDWriter; import java.io.file; import java.io.fileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.util.ArrayList; import java.util.List;  import org.opencv.androID.BaseLoaderCallback; import org.opencv.androID.LoaderCallbackInterface; import org.opencv.androID.OpenCVLoader; import org.opencv.core.*; import org.opencv.highgui.*; import org.opencv.imgproc.*; import org.opencv.utils.Converters;  import androID.graphics.Bitmap; import androID.graphics.BitmapFactory; import androID.graphics.Matrix; import androID.harDWare.Camera; import androID.harDWare.Camera.autoFocusCallback; import androID.harDWare.Camera.Parameters; import androID.harDWare.Camera.PictureCallback; import androID.os.Bundle; import androID.os.Environment; import androID.os.Handler; import androID.app.Activity; import androID.content.pm.ActivityInfo; import androID.vIEw.MotionEvent; import androID.vIEw.SurfaceHolder; import androID.vIEw.SurfaceHolder.Callback; import androID.vIEw.SurfaceVIEw; import androID.vIEw.VIEw;  public class capture extends Activity {  private SurfaceVIEw picSV;  private Camera camera;  private String strPicPath;    //OpenCV类库加载并初始化成功后的回调函数，在此我们不进行任何 *** 作  private BaseLoaderCallback mloaderCallback = new BaseLoaderCallback(this) {   @OverrIDe   public voID onManagerConnected(int status) {    switch (status) {     case LoaderCallbackInterface.SUCCESS:{     } break;     default:{      super.onManagerConnected(status);     } break;    }   }  };    @SuppressWarnings("deprecation")  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   this.setRequestedOrIEntation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);   setContentVIEw(R.layout.main);   picSV = (SurfaceVIEw) findVIEwByID(R.ID.picSV);   picSV.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);   picSV.getHolder().addCallback(new MyCallback());  }   private class MyCallback implements Callback{  //我们在SurfaceVIEw创建的时候就要进行打开摄像头、设置预览取景所在的SurfaceVIEw、设置拍照的参数、开启预览取景等 *** 作   @OverrIDe   public voID surfaceCreated(SurfaceHolder holder) {    try {     camera = Camera.open();//打开摄像头     camera.setPrevIEwdisplay(picSV.getHolder());//设置picSV来进行预览取景     Parameters params = camera.getParameters();//获取照相机的参数     params.setPictureSize(800,480);//设置照片的大小为800*480     params.setPrevIEwSize(800,480);//设置预览取景的大小为800*480     params.setFlashMode("auto");//开启闪光灯     params.setJpegQuality(50);//设置图片质量为50       camera.setParameters(params);//设置以上参数为照相机的参数     camera.startPrevIEw();    }    catch (IOException e) {    //开始预览取景，然后我们就可以拍照了     e.printstacktrace();    }   }     @OverrIDe   public voID surfaceChanged(SurfaceHolder holder,int format,int wIDth,int height) {   }     @OverrIDe   public voID surfaceDestroyed(SurfaceHolder holder) {    //当SurfaceVIEw销毁时，我们进行停止预览、释放摄像机、垃圾回收等工作    camera.stopPrevIEw();    camera.release();    camera = null;   }  }   public voID takepic(VIEw v){   //在我们开始拍照前，实现自动对焦   camera.autoFocus(new MyautoFocusCallback());  }   private class MyautoFocusCallback implements autoFocusCallback{   @OverrIDe   public voID onautoFocus(boolean success,Camera camera) {    //开始拍照    camera.takePicture(null,null,new MyPictureCallback());   }  }   private class MyPictureCallback implements PictureCallback{   @OverrIDe   public voID onPictureTaken(byte[] data,Camera camera) {    try {     Bitmap bitmap = BitmapFactory.decodeByteArray(data,data.length);     Matrix matrix = new Matrix();     matrix.preRotate(90);     bitmap = Bitmap.createBitmap(bitmap,bitmap.getWIDth(),bitmap.getHeight(),matrix,true);     strPicPath =      Environment.getExternalStorageDirectory()+"/1Zxing/"+System.currentTimeMillis()+".jpg";     fileOutputStream fos = new fileOutputStream( strPicPath );     bitmap.compress(Bitmap.CompressFormat.PNG,100,fos);     fos.close();     Handler mHandler = new Handler();     mHandler.post(mRunnable);     camera.startPrevIEw();    }    catch (Exception e) {     e.printstacktrace();    }   }  }    public boolean ontouchEvent (MotionEvent event)  {   int Action = event.getAction();   if ( 1 == Action ) {    camera.autoFocus(new MyautoFocusCallback1());   }   return true;  }    private class MyautoFocusCallback1 implements autoFocusCallback {   @OverrIDe   public voID onautoFocus(boolean success,Camera camera) {   }  }    @OverrIDe  public voID onResume(){   super.onResume();   //通过OpenCV引擎服务加载并初始化OpenCV类库，所谓OpenCV引擎服务即是   //OpenCV_2.4.3.2_Manager_2.4_*.apk程序包，存在于OpenCV安装包的apk目录中   OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_10,this,mloaderCallback);  }   Runnable mRunnable = new Runnable() {   public voID run() {    List<MatOfPoint> contours = new ArrayList<MatOfPoint>();    String strMissingTime = null;    Mat srccolor = new Mat(),srccolorResize = new Mat();    Mat srcGray = new Mat(),srcGrayResize = new Mat(),srcGrayResizeThresh = new Mat();    srcGray = Highgui.imread(strPicPath,0);    srccolor = Highgui.imread(strPicPath,1);    imgproc.resize(srcGray,srcGrayResize,new Size(srcGray.cols()*0.2,srcGray.rows()*0.2));    imgproc.resize(srccolor,srccolorResize,srcGray.rows()*0.2));    long start = System.currentTimeMillis();    //二值化加轮廓寻找    imgproc.adaptiveThreshold(srcGrayResize,srcGrayResizeThresh,255,imgproc.ADAPTIVE_THRESH_GAUSSIAN_C,imgproc.THRESH_BINARY,35,5);    imgproc.findContours(srcGrayResizeThresh,contours,new Mat(),imgproc.RETR_List,imgproc.CHAIN_APPROX_NONE);    long end = System.currentTimeMillis();    strMissingTime = String.valueOf( end - start );    strMissingTime = strMissingTime + "\r";    //轮廓绘制    for ( int i = contours.size()-1; i >= 0; i-- )    {     MatOfPoint2f NewMtx = new MatOfPoint2f( contours.get(i).toArray() );     RotatedRect rotRect = imgproc.minAreaRect( NewMtx );     Point vertices[] = new Point[4];     rotRect.points(vertices);     List<Point> rectArea = new ArrayList<Point>();     for ( int n = 0; n < 4; n ++ )     {      Point temp = new Point();      temp.x = vertices[n].x;      temp.y = vertices[n].y;      rectArea.add(temp);     }     Mat rectMat = Converters.vector_Point_to_Mat(rectArea);     double minRectArea = imgproc.contourArea( rectMat );     Point center = new Point();     float radius[] = {0};     imgproc.minenclosingCircle(NewMtx,center,radius);     if(      imgproc.contourArea( contours.get(i)) < 300 ||      imgproc.contourArea( contours.get(i)) > 3000      || minRectArea < radius[0]*radius[0]*1.57     ) contours.remove(i);    }    imgproc.drawContours(srccolorResize,-1,new Scalar(255,0));    Highgui.imwrite(Environment.getExternalStorageDirectory()+"/1Zxing/"        +System.currentTimeMillis()+"contour.jpg",srccolorResize);      file file=new file(Environment.getExternalStorageDirectory()+"/1Zxing/","log.txt");    BuffereDWriter out = null;    try {     out = new BuffereDWriter(new OutputStreamWriter(new fileOutputStream(file,true)));     out.write(strMissingTime);     out.close();    }    catch (Exception e) {     e.printstacktrace();    }      }  }; } 

layout.xml 文件

<FrameLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:tools="http://schemas.androID.com/tools"  androID:layout_wIDth="match_parent"  androID:layout_height="match_parent"  tools:context=".MainActivity" >    <SurfaceVIEw   androID:ID="@+ID/picSV"   androID:layout_wIDth="match_parent"   androID:layout_height="match_parent"   >  </SurfaceVIEw>    <Imagebutton   androID:contentDescription="@string/desc"   androID:onClick="takepic"   androID:layout_wIDth="wrap_content"   androID:layout_height="wrap_content"   androID:layout_gravity="right|top"   androID:src="@androID:drawable/ic_menu_camera" />   </FrameLayout> 

string.xml 文件

<resources>  <string name="app_name">Code</string>  <string name="desc">Take picture button</string> </resources> 

style.xml 文件（理论上是可以自动生成，若自动生成内容有错，可以参考）

<resources>   <!--   Base application theme,dependent on API level. This theme is replaced   by AppBasetheme from res/values-vXX/styles.xml on newer devices.  -->  <style name="AppBasetheme" parent="androID:theme.light">   <!--    theme customizations available in newer API levels can go in    res/values-vXX/styles.xml,while customizations related to    backward-compatibility can go here.   -->  </style>   <!-- Application theme. -->  <style name="Apptheme" parent="AppBasetheme">   <!-- All customizations that are NOT specific to a particular API-level can go here. -->   <item name="androID:windowNoTitle">true</item>   <item name="androID:windowFullscreen">true</item>  </style>   </resources> 

AndroIDManifest.xml 文件

<manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"  package="cn.hjq.androID_capture"  androID:versionCode="1"  androID:versionname="1.0" >    <uses-permission   androID:name="androID.permission.CAMERA"/>  <uses-permission   androID:name="androID.permission.WRITE_EXTERNAL_STORAGE"/>   <uses-sdk   androID:minSdkVersion="8"   androID:targetSdkVersion="19" />   <application   androID:allowBackup="true"   androID:icon="@drawable/ic_launcher"   androID:label="@string/app_name"   androID:theme="@style/Apptheme" >   <activity    androID:name=".capture" >    <intent-filter >     <action androID:name="androID.intent.action.MAIN" />     <category androID:name="androID.intent.category.LAUNCHER" />    </intent-filter>   </activity>  </application>  </manifest> 

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