java - 从位图android实现人脸检测

Question

• 人脸检测

我有一个位图想在 java 中从该位图中检测人脸。任何人都知道从图像中获取人脸。

Answer 1

您可以尝试使用此代码在您在位图图像中检测到的每个人脸周围绘制一个矩形。

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.View;

public class FaceDetection extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(new myView(this));
 }

 private class myView extends View {

  private int imageWidth, imageHeight;
  private int numberOfFace = 5;
  private FaceDetector myFaceDetect;
  private FaceDetector.Face[] myFace;
  float myEyesDistance;
  int numberOfFaceDetected;

  Bitmap myBitmap;

  public myView(Context context) {
   super(context);

   BitmapFactory.Options BitmapFactoryOptionsbfo = new BitmapFactory.Options();
   BitmapFactoryOptionsbfo.inPreferredConfig = Bitmap.Config.RGB_565;
   myBitmap = BitmapFactory.decodeResource(getResources(),
     R.drawable.jennifer_lopez, BitmapFactoryOptionsbfo);
   imageWidth = myBitmap.getWidth();
   imageHeight = myBitmap.getHeight();
   myFace = new FaceDetector.Face[numberOfFace];
   myFaceDetect = new FaceDetector(imageWidth, imageHeight,
     numberOfFace);
   numberOfFaceDetected = myFaceDetect.findFaces(myBitmap, myFace);

  }

  @Override
  protected void onDraw(Canvas canvas) {

   canvas.drawBitmap(myBitmap, 0, 0, null);

   Paint myPaint = new Paint();
   myPaint.setColor(Color.GREEN);
   myPaint.setStyle(Paint.Style.STROKE);
   myPaint.setStrokeWidth(3);

   for (int i = 0; i < numberOfFaceDetected; i++) {
    Face face = myFace[i];
    PointF myMidPoint = new PointF();
    face.getMidPoint(myMidPoint);
    myEyesDistance = face.eyesDistance();

    canvas.drawRect((int) (myMidPoint.x - myEyesDistance * 2),
      (int) (myMidPoint.y - myEyesDistance * 2),
      (int) (myMidPoint.x + myEyesDistance * 2),
      (int) (myMidPoint.y + myEyesDistance * 2), myPaint);
   }
  }
 }

}