我目前正在使用SurfaceView
中的CameraSource
和com.google.android.gms.vision
来捕获图像上检测到的文本,但是由于它捕获了SurfaceView
区域中的所有内容,因此我需要丢弃一些恢复的内容。
[目标是使SurfaceView
像下一张图片一样工作,忽略红色交叉区域中所有检测到的文本,只给我蓝色正方形上的东西。
这甚至有可能吗?
这里是布局(没什么特别的):
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/fragment_surface"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
并且这里在类上有与OCR相关的代码:
public class CameraActivity extends AppCompatActivity {
private SurfaceView surfaceView;
private CameraSource cameraSource;
private StringBuilder builder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
surfaceView = (SurfaceView) findViewById(R.id.fragment_surface);
TextRecognizer recognizer = new TextRecognizer.Builder(getApplicationContext()).build();
if (recognizer.isOperational()) {
cameraSource = new CameraSource.Builder(getApplicationContext(), recognizer)
.setFacing(CameraSource.CAMERA_FACING_BACK)
.setRequestedPreviewSize(1280, 1024)
.setRequestedFps(15.0f)
.setAutoFocusEnabled(true)
.build();
surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(CameraActivity.this, new String[]{Manifest.permission.CAMERA}, 100);
return;
}
try {
cameraSource.start(surfaceView.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
//
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
cameraSource.stop();
}
});
recognizer.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) {
builder = new StringBuilder();
for (int i = 0; i < items.size(); i++) {
TextBlock it = items.valueAt(i);
builder.append(it.getValue());
}
String read = builder.toString().trim().replace(" ", "").replace("\n", "");
//It continues doing other things here
}
}
});
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case 100:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
try {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
return;
}
cameraSource.start(surfaceView.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
break;
}
}
}
[当设备处于纵向模式时(如您的图片中所示),非红色区域应为“相机预览”的裁剪部分(充满整个屏幕,因此:]]]
我建议您“升级”到TextureView