android - 使用图库中的所有图像在 Android Studio 中进行人脸识别

Question

我正在尝试使用图库中的图像制作一个 Android 应用程序(在 Android Studio 中)以进行人脸识别。这是我的源代码(使用我从开放类(class)网页上找到的内容)，它正在收集我的图像，但我只希望这些图像显示至少包含一张脸。我知道我需要以某种方式使用 FaceDetection，但我不知道如何使用。

这是我的代码:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final String[] columns = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID};
    final String orderBy = MediaStore.Images.Media._ID;
    Cursor imagecursor = managedQuery(
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
        columns,
        null,
        null,
        orderBy
    );
    int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
    this.count = imagecursor.getCount();
    this.thumbnails = new Bitmap[this.count];
    this.arrPath = new String[this.count];
    this.thumbnailsselection = new boolean[this.count];
    for (int i = 0; i < this.count; i++) {
        imagecursor.moveToPosition(i);
        int id = imagecursor.getInt(image_column_index);
        int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
        thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
            getApplicationContext().getContentResolver(),
            id,
            MediaStore.Images.Thumbnails.MICRO_KIND,
            null
        );
        arrPath[i] = imagecursor.getString(dataColumnIndex);
    }
    GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
    imageAdapter = new ImageAdapter();
    imagegrid.setAdapter(imageAdapter);

    Bitmap bitmap_column;
    bitmap_column = new Bitmap(thumbnails);

    BitmapFactory.Options bitmap = new BitmapFactory.Options();
    bitmap.inPreferredConfig = Bitmap.Config.RGB_565;
    imageWidth = thumbnails.getWidth();
    imageHeight = thumbnails.getHeight();

    myFace = new FaceDetector.Face[numberOfFace];
    myFaceDetect = new FaceDetector(imageWidth, imageHeight, numberOfFace);
    numberOfFaceDetected = myFaceDetect.findFaces(thumbnails, myFace);

    imagecursor.close();

    final Button selectBtn = (Button) findViewById(R.id.selectBtn);
    selectBtn.setOnClickListener(new OnClickListener() {            
        public void onClick(View v) {
            // TODO Auto-generated method stub
            final int len = thumbnailsselection.length;
            int cnt = 0;
            String selectImages = "";
            for (int i =0; i<len; i++)
            {
                if (thumbnailsselection[i]) {
                    cnt++;
                    selectImages = selectImages + arrPath[i] + "|";
                }
            }
            if (cnt == 0){
                Toast.makeText(
                    getApplicationContext(),
                    "Please select at least one image",
                    Toast.LENGTH_LONG
                ).show();
            } else {
                Toast.makeText(
                    getApplicationContext(),
                    "You've selected Total " + cnt + " image(s).",
                    Toast.LENGTH_LONG
                ).show();
                Log.d("SelectedImages", selectImages);
            }
        }
    });
}

ImageAdapter 类:

public class ImageAdapter extends BaseAdapter {
    private LayoutInflater mInflater;

    public ImageAdapter() {
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public int getCount() {
        return count;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(
                R.layout.galleryitem,
                null
            );
            holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
            holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.checkbox.setId(position);
        holder.imageview.setId(position);
        holder.checkbox.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                CheckBox cb = (CheckBox) v;
                int id = cb.getId();
                if (thumbnailsselection[id]) {
                    cb.setChecked(false);
                    thumbnailsselection[id] = false;
                } else {
                    cb.setChecked(true);
                    thumbnailsselection[id] = true;
                }
            }
        });
        holder.imageview.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                int id = v.getId();
                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.parse("file://" + arrPath[id]), "image/*");
                startActivity(intent);
            }
        });
        holder.imageview.setImageBitmap(thumbnails[position]);
        holder.checkbox.setChecked(thumbnailsselection[position]);
        holder.id = position;
        return convertView;
    }
}

ViewHolder类:

class ViewHolder {
    ImageView imageview;
    CheckBox checkbox;
    int id;
}

Answer 1

private boolean hasFace(Bitmap inBmp){
    Bitmap bmp = inBmp.copy(Bitmap.Config.RGB_565, true);
    FaceDetector fd = new FaceDetector(bmp.getWidth(), bmp.getHeight(), 1);
    Face faces[] = new Face[1];
    int numFaces = fd.findFaces(bmp, faces);
    bmp.recycle();
    return numFaces > 0;
}

这将告诉您位图是否有脸。移动光标，仅将返回 true 的图像添加到传递给适配器的数组中。由于运行所需的时间，我强烈建议在 AsyncTask 上执行此操作。我还建议对其进行设置，使其定期填充适配器(因为这需要一段时间)或至少显示某种处理 UI，以便用户知道这需要一段时间。