opencv 안드로이드 facerecognition

Question

이것은 http://www.java2s.com/Open-Source/Android_Free_Code/Facebook/Download_Free_code_face_recognition.htm에서 다운로드 한 얼굴 인식 코드입니다.

package face_recognition; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.MalformedURLException; 
import java.util.LinkedList; 

import org.opencv.android.Utils; 
import org.opencv.core.Core; 
import org.opencv.core.Mat; 
import org.opencv.core.Rect; 
import org.opencv.core.Scalar; 
import org.opencv.objdetect.CascadeClassifier; 

import com.face_recognition.R; 
import com.googlecode.javacpp.Loader; 
import com.googlecode.javacv.cpp.opencv_objdetect; 

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.ImageView; 

public class ImageRecognitionActivity extends Activity { 

private Mat imageMat; 

private FacebookImage facebookImage = null; 

private Context context=this; 

private ImageView imageView; 

private Bitmap fbImage; 

private CascadeClassifier mCascade; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.view3_layout); 
    imageView = (ImageView) findViewById(R.id.imageview); 

    Intent intent = getIntent(); 
    Bundle b = intent.getExtras(); 
    String chosenImageUrl = (String) b.get("chosenImageUrl"); 

    try {       
     facebookImage = new FacebookImage(chosenImageUrl);  
     fbImage = facebookImage.getPicture(); 


     imageMat =     org.opencv.android.Utils.bitmapToMat(fbImage.copy(Bitmap.Config.ARGB_8888,true)); 

참고 : //이 줄에는 오류가 발생합니다. 그것은 그것이 매트를 기대하고 있다고 말하면, 그것을 말하면서 // 매트에서 void로 변환 할 수 없다고 말하면서 그것을 추가합니다. 어떻게 해결합니까?

} catch (MalformedURLException e) { /* ... */ e.printStackTrace(); 
    } catch (IOException e)  { /* ... */ e.printStackTrace(); 
    } 

    Loader.load(opencv_objdetect.class); 

    try { 

     InputStream is = context.getResources().openRawResource(R.raw.haarcascade_frontalface_alt); 
     File cascadeDir = context.getDir("cascade", Context.MODE_PRIVATE); 
     File cascadeFile = new File(cascadeDir, "lbpcascade_frontalface.xml"); 
     FileOutputStream os = new FileOutputStream(cascadeFile); 

     byte[] buffer = new byte[4096]; 
     int bytesRead; 
     while ((bytesRead = is.read(buffer)) != -1) { 
      os.write(buffer, 0, bytesRead); 
     } 
     is.close(); 
     os.close(); 

     mCascade = new CascadeClassifier(cascadeFile.getAbsolutePath()); 
     if (mCascade.empty()) { 
       Log.e("TAG", "Failed to load cascade classifier"); 
       mCascade = null; 
     } else 
      Log.i("TAG", "Loaded cascade classifier from " + cascadeFile.getAbsolutePath()); 

     cascadeFile.delete(); 
     cascadeDir.delete(); 

    } catch (IOException e) { 
     e.printStackTrace(); 
     Log.e("TAG", "Failed to load cascade. Exception thrown: " + e); 
    } 

    LinkedList<Rect> facesdetection = new LinkedList<Rect>(); 

    mCascade.detectMultiScale(imageMat, facesdetection); 

    Bitmap imageBitmap = null; 
    for (Rect r : facesdetection){ 
     Core.rectangle(imageMat, r.tl(), r.br(), new Scalar(0, 255, 0, 255), 2); 
    } 

    imageBitmap = Bitmap.createBitmap(imageMat.cols(), imageMat.rows(), Bitmap.Config.ARGB_8888); 
    Utils.matToBitmap(imageMat, imageBitmap); 
    imageView.setImageBitmap(imageBitmap); 
} 

}

Answer 1

bitmapToMat 아무것도 반환하지 않습니다. 다음과 같이 결과 매트를 인수로 전달해야합니다.

imageMat = new Mat(); 
org.opencv.android.Utils.bitmapToMat(fbImage.copy(Bitmap.Config.ARGB_8888,true), imageMat);