在安卓中使用人脸识别技术裁剪图片

Question

我需要一个演示，其中任何图像都可以使用人脸检测功能进行裁剪。

已修复

但是在浏览了几个小时之后，我没有找到一个单独的演示，因此我准备了一个单独的演示，并结合了我在网上找到的一些演示。

我准备了一个演示来裁剪图像。

我的演示可以将图像裁剪成矩形和圆形。

它还会检测人脸并根据人脸检测裁剪图像。

我正在使用以下图片进行裁剪。

裁剪结果的截图如下：

示例的XML为：

<LinearLayout 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"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity" >

<View
    android:id="@+id/part1"
    android:layout_width="fill_parent"
    android:layout_height="100dp" >
</View>

<View
    android:id="@+id/part2"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_marginTop="30dp" >
</View>

</LinearLayout>

Activity的Java代码：

public class MainActivity extends Activity {
public View part1, part2;
int viewHeight, viewWidth;
private FaceDetector myFaceDetect;
private FaceDetector.Face[] myFace;
float myEyesDistance;

@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    part1 = findViewById(R.id.part1);
    part2 = findViewById(R.id.part2);
    part1.post(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            viewHeight = part1.getMeasuredHeight();
            viewWidth = part1.getMeasuredWidth();
            try {

                Paint paint = new Paint();
                paint.setFilterBitmap(true);
                Bitmap bitmapOrg = BitmapFactory.decodeResource(
                        getResources(),
                        R.drawable.sachin_tendulkar_10102013);

                int targetWidth = bitmapOrg.getWidth();
                int targetHeight = bitmapOrg.getHeight();

                Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
                        targetHeight, Bitmap.Config.ARGB_8888);

                RectF rectf = new RectF(0, 0, viewWidth, viewHeight);

                Canvas canvas = new Canvas(targetBitmap);
                Path path = new Path();

                path.addRect(rectf, Path.Direction.CW);
                canvas.clipPath(path);

                canvas.drawBitmap(
                        bitmapOrg,
                        new Rect(0, 0, bitmapOrg.getWidth(), bitmapOrg
                                .getHeight()), new Rect(0, 0, targetWidth,
                                targetHeight), paint);

                Matrix matrix = new Matrix();
                matrix.postScale(1f, 1f);

                BitmapFactory.Options bitmapFatoryOptions = new BitmapFactory.Options();
                bitmapFatoryOptions.inPreferredConfig = Bitmap.Config.RGB_565;

                bitmapOrg = BitmapFactory.decodeResource(getResources(),
                        R.drawable.sachin_tendulkar_10102013,
                        bitmapFatoryOptions);

                myFace = new FaceDetector.Face[5];
                myFaceDetect = new FaceDetector(targetWidth, targetHeight,
                        5);
                int numberOfFaceDetected = myFaceDetect.findFaces(
                        bitmapOrg, myFace);
                Bitmap resizedBitmap = null;
                if (numberOfFaceDetected > 0) {
                    PointF myMidPoint = null;
                    Face face = myFace[0];
                    myMidPoint = new PointF();
                    face.getMidPoint(myMidPoint);
                    myEyesDistance = face.eyesDistance();

                    if (myMidPoint.x + viewWidth > targetWidth) {
                        while (myMidPoint.x + viewWidth > targetWidth) {
                            myMidPoint.x--;
                        }
                    }
                    if (myMidPoint.y + viewHeight > targetHeight) {
                        while (myMidPoint.y + viewHeight > targetHeight) {
                            myMidPoint.y--;
                        }
                    }
                    resizedBitmap = Bitmap.createBitmap(bitmapOrg,
                            (int) (myMidPoint.x - myEyesDistance),
                            (int) (myMidPoint.y - myEyesDistance),
                            viewWidth, viewHeight, matrix, true);
                } else {
                    resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
                            viewWidth, viewHeight, matrix, true);
                }
                /* convert Bitmap to resource */
                // Bitmap resizedBitmap = Bitmap.createBitmap(targetBitmap,
                // 0,
                // 0, viewWidth, viewHeight, matrix, true);
                BitmapDrawable bd = new BitmapDrawable(resizedBitmap);

                part1.setBackgroundDrawable(bd);

            } catch (Exception e) {
                System.out.println("Error1 : " + e.getMessage()
                        + e.toString());
            }
        }
    });
    part2.post(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            viewHeight = part2.getMeasuredHeight();
            viewWidth = part2.getMeasuredWidth();
            try {

                Paint paint = new Paint();
                paint.setFilterBitmap(true);
                Bitmap bitmapOrg = BitmapFactory.decodeResource(
                        getResources(),
                        R.drawable.sachin_tendulkar_10102013);

                int targetWidth = bitmapOrg.getWidth();
                int targetHeight = bitmapOrg.getHeight();

                Bitmap targetBitmap = Bitmap.createBitmap(targetWidth,
                        targetHeight, Bitmap.Config.ARGB_8888);

                RectF rectf = new RectF(0, 0, viewWidth, viewHeight);

                Canvas canvas = new Canvas(targetBitmap);
                Path path = new Path();

                path.addRect(rectf, Path.Direction.CW);
                canvas.clipPath(path);

                canvas.drawBitmap(
                        bitmapOrg,
                        new Rect(0, 0, bitmapOrg.getWidth(), bitmapOrg
                                .getHeight()), new Rect(0, 0, targetWidth,
                                targetHeight), paint);

                Matrix matrix = new Matrix();
                matrix.postScale(1f, 1f);

                BitmapFactory.Options bitmapFatoryOptions = new BitmapFactory.Options();
                bitmapFatoryOptions.inPreferredConfig = Bitmap.Config.RGB_565;

                bitmapOrg = BitmapFactory.decodeResource(getResources(),
                        R.drawable.sachin_tendulkar_10102013,
                        bitmapFatoryOptions);

                myFace = new FaceDetector.Face[5];
                myFaceDetect = new FaceDetector(targetWidth, targetHeight,
                        5);
                int numberOfFaceDetected = myFaceDetect.findFaces(
                        bitmapOrg, myFace);
                Bitmap resizedBitmap = null;
                if (numberOfFaceDetected > 0) {
                    PointF myMidPoint = null;
                    Face face = myFace[0];
                    myMidPoint = new PointF();
                    face.getMidPoint(myMidPoint);
                    myEyesDistance = face.eyesDistance() + 20;

                    if (myMidPoint.x + viewWidth > targetWidth) {
                        while (myMidPoint.x + viewWidth > targetWidth) {
                            myMidPoint.x--;
                        }
                    }
                    if (myMidPoint.y + viewHeight > targetHeight) {
                        while (myMidPoint.y + viewHeight > targetHeight) {
                            myMidPoint.y--;
                        }
                    }
                    resizedBitmap = Bitmap.createBitmap(bitmapOrg,
                            (int) (myMidPoint.x - myEyesDistance),
                            (int) (myMidPoint.y - myEyesDistance),
                            viewWidth, viewHeight, matrix, true);
                } else {
                    resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
                            viewWidth, viewHeight, matrix, true);
                }
                /* convert Bitmap to resource */
                // Bitmap resizedBitmap = Bitmap.createBitmap(targetBitmap,
                // 0,
                // 0, viewWidth, viewHeight, matrix, true);
                BitmapDrawable bd = new  BitmapDrawable(resizedBitmap);

                part2.setBackgroundDrawable(new BitmapDrawable(
                        getCroppedBitmap(bd.getBitmap())));

            } catch (Exception e) {
                System.out.println("Error1 : " + e.getMessage()
                        + e.toString());
            }
        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

public Bitmap getCroppedBitmap(Bitmap bitmap) {
    // Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
    // bitmap.getHeight(), Config.ARGB_8888);
    // Canvas canvas = new Canvas(output);
    //
    // final int color = 0xff424242;
    // final Paint paint = new Paint();
    // final Rect rect = new Rect(0, 0, bitmap.getWidth(),
    // bitmap.getHeight());
    //
    // paint.setAntiAlias(true);
    // canvas.drawARGB(0, 0, 0, 0);
    // paint.setColor(color);
    // // canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    // canvas.drawCircle(bitmap.getWidth() / 2, bitmap.getHeight() / 2,
    // bitmap.getWidth() / 2, paint);
    // paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    // canvas.drawBitmap(bitmap, rect, rect, paint);
    // // Bitmap _bmp = Bitmap.createScaledBitmap(output, 60, 60, false);
    // // return _bmp;
    // return output;

    int targetWidth = bitmap.getWidth();
    int targetHeight = bitmap.getHeight();
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, targetHeight,
            Bitmap.Config.ARGB_8888);

    Canvas canvas = new Canvas(targetBitmap);
    Path path = new Path();
    path.addCircle(((float) targetWidth - 1) / 2,
            ((float) targetHeight - 1) / 2,
            (Math.min(((float) targetWidth), ((float) targetHeight)) /    2),
            Path.Direction.CCW);

    canvas.clipPath(path);
    Bitmap sourceBitmap = bitmap;
    canvas.drawBitmap(sourceBitmap, new Rect(0, 0, sourceBitmap.getWidth(),
            sourceBitmap.getHeight()), new Rect(0, 0, targetWidth,
            targetHeight), null);
    return targetBitmap;

}

}

- Priyank Joshi

---

现在有什么问题？ - GrIsHu

我的问题现在已经解决了，但是我上传了代码，以防有人需要，谢谢。 - Priyank Joshi

它在任何图像中都能工作吗？ - GrIsHu

是的，你只需要将图片放在任何drawable文件夹中，就像我所做的那样。如果你想从相册裁剪任何图像，只需创建一个名为bitmapOrg的位图即可，并继续进行演示。 - Priyank Joshi

请问Priyank Joshi能否帮我解决这个问题：http://stackoverflow.com/questions/30879294/image-crop-multiple-faces-and-save-faces-in-list-view-in-andriod。谢谢！ - ABi

Answer 1

这个演示适用于放在drawable文件夹中的任何图像，

但是，如果您想裁剪任何动态图像，例如从图库下载或选择的任何图像，请对代码进行一些更改：

请查看以下行：

Bitmap bitmapOrg = BitmapFactory.decodeResource(
                    getResources(),
                    R.drawable.sachin_tendulkar_10102013);

我现在从drawable文件夹中获取图片，对于任何下载的图片，你只需要将该图片保存在bitmapOrg变量中，所以只需更改上面的两行代码，一行用于矩形部分1，另一行用于圆形部分2，将下载的图像保存为bitmapOrg的位图，并使用演示，它将以矩形和圆形方式裁剪您的图像。

- Priyank Joshi

---

我曾经使用过这个，但并不能在每张图片上都得到100%的结果。如果你使用新的Google Vision API进行分类，那么就可以得到100%的准确率。 - Uday Nayak