限制我的TextRecognizer检测器的区域

Question

我正在使用Google的API， TextRecognizer ，通过摄像头返回文本。我做了很多研究，显然您不能真正限制检测范围。我正在听到相机看到的每个字。我正在尝试找到一种解决方案，其中您只会得到一个单词。你有什么建议吗？

TextRecognizer textRecognizer = new TextRecognizer.Builder(context).build();
    if (!textRecognizer.isOperational()) {
        Log.w("MainActivity", "Detector dependencies are not yet available");
    } else {
        cameraSource = new CameraSource.Builder(context, textRecognizer)
                .setFacing(CameraSource.CAMERA_FACING_BACK)
                .setRequestedPreviewSize(1920, 1080)
                .setRequestedFps(15.0f)
                .setAutoFocusEnabled(true)
                .build();
        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                try {
                    if (ActivityCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {

                        ActivityCompat.requestPermissions(MainActivity.this,
                                new String[]{Manifest.permission.CAMERA},
                                RequestCameraPermissionID);
                        return;
                    }
                    cameraSource.start(surfaceView.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
                cameraSource.stop();
            }
        });

        textRecognizer.setProcessor(new Detector.Processor<TextBlock>() {
            @Override
            public void release() {

            }

            @Override
            public void receiveDetections(Detector.Detections<TextBlock> detections) {
                final SparseArray<TextBlock> items = detections.getDetectedItems();
                if (items.size() != 0 && isButtonDown) {
                    wordTextView.post(new Runnable() {
                        @Override
                        public void run() {
                            StringBuilder stringBuilder = new StringBuilder();
                            for (int i = 0; i < items.size(); ++i) {
                                TextBlock item = items.valueAt(i);
                                stringBuilder.append(item.getValue());
                                stringBuilder.append("\n");
                            }

                            wordTextView.setText(stringBuilder.toString());
                        }
                    });
                }
            }
        });
    }