如何在ARCore中提高预览相机的质量

Question

我在我的android项目中使用ARCore。它有一个活动MainActivity.java和一个CustomArFragment.java。

问题是相机的质量很低。如何提高相机预览分辨率。以后，我需要用相机识别文本，而且质量很低，很难识别。我在谷歌上找不到解决方案。尝试了很多事情都没有成功。任何人请告诉如何提高相机质量。我对AR和安卓领域完全陌生。

谢谢：(

MainActivity.java:

public class MainActivity extends AppCompatActivity {
private CustomArFragment arFragment;
private TextView textView;
private AugmentedImageDatabase aid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
arFragment = (CustomArFragment) getSupportFragmentManager().findFragmentById(R.id.arFragment);
textView = findViewById(R.id.textView);
arFragment.getArSceneView().getScene().addOnUpdateListener(this::onUpdate);
findViewById(R.id.registeredBtn).setOnClickListener(v -> {
if(ActivityCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
return;
}
registeredImage();
});

}

private void registeredImage() {
File file = new File(getExternalFilesDir(null) + "/db.imgdb");
try {
FileOutputStream outputStream = new FileOutputStream(file);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.earth);
aid.addImage("earth",bitmap);
aid.serialize(outputStream);
outputStream.close();
Toast.makeText(this, "image Registered", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
private void onUpdate(FrameTime frameTime) {
frame = arFragment.getArSceneView().getArFrame();
Collection<AugmentedImage> images = frame.getUpdatedTrackables(AugmentedImage.class);
for(AugmentedImage image : images){
if(image.getTrackingMethod() == AugmentedImage.TrackingMethod.FULL_TRACKING){
if(image.getName().equals("lion")){
textView.setText("LION is visible");
}
else if(image.getName().equals("download")){
textView.setText("download is visible");
}
else{
textView.setText("Nothing is visible till now");
}
Log.d("Value of textView : "," " + textView.getText());
}
Log.d("Value of textView1 : "," " + textView.getText());
}
}
public void loadDB(Session session, Config config){
//InputStream dbStream = getResources().openRawResource(R.raw.imagedb);
try {
File file = new File(getExternalFilesDir(null) + "/db.imgdb");
FileInputStream dbStream = new FileInputStream(file);
aid = AugmentedImageDatabase.deserialize(session, dbStream);
config.setAugmentedImageDatabase(aid);
session.configure(config);
Log.d("TotalImages"," :  " + aid.getNumImages());
}catch (IOException e){
e.printStackTrace();
}
}

CustomArFragment.java

public class CustomArFragment extends ArFragment {
@Override
protected Config getSessionConfiguration(Session session){
getPlaneDiscoveryController().setInstructionView(null);
Config config = new Config(session);
config.setUpdateMode(Config.UpdateMode.LATEST_CAMERA_IMAGE);
MainActivity activity = (MainActivity) getActivity();
activity.loadDB(session,config);
this.getArSceneView().setupSession(session);
return config;
}
}

Answer 1

我在另一个问题中添加了一些关于类似主题的信息。但在回答您的问题时，请检查默认使用的CameraConfig(在会话中使用getCameraConfig(((。然后，您可以通过getSupportedCameraConfig((获得您感兴趣的(高GPU纹理大小(，并通过setCameraConfig配置会话。

再读一遍你的问题，如果你将来需要识别图像上的一些文本，你可能想获得更高的CPU图像，而不是GPU纹理大小。您仍然可以使用CameraConfig来检查并选择您最喜欢的，但请记住，较高的CPU图像会大大降低性能。你可能想核对一下我前面提到的问题的答案。

编辑：使用此代码片段检查正在使用的CameraConfig，并根据您的需求进行调整：

Session session = new Session(requireActivity());
// ...
Size selectedSize = new Size(0, 0);
CameraConfig selectedCameraConfig = null;
CameraConfigFilter filter = new CameraConfigFilter(session);
List<CameraConfig> cameraConfigsList = session.getSupportedCameraConfigs(filter);
for (CameraConfig currentCameraConfig : cameraConfigsList) {
Size cpuImageSize = currentCameraConfig.getImageSize();
Size gpuTextureSize = currentCameraConfig.getTextureSize();
Log.d("TAG", "CurrentCameraConfig CPU image size:" + cpuImageSize + " GPU texture size:" + gpuTextureSize);
// Adapt this check to your needs
if (gpuTextureSize.getWidth() > selectedSize.getWidth()) {
selectedSize = gpuTextureSize;
selectedCameraConfig = currentCameraConfig;
}
}
Log.d("TAG", "Selected CameraConfig CPU image size:" + selectedCameraConfig.getImageSize() + " GPU texture size:" + selectedCameraConfig.getTextureSize());
session.setCameraConfig(selectedCameraConfig);
// ...
// Don't forget to configure the session afterwards
session.configure(config);