FirebaseVisionTextRecognizer

public class FirebaseVisionTextRecognizer extends Object
implements Closeable

Text recognizer for performing optical character recognition(OCR) on an input image.

A text recognizer is created via getOnDeviceTextRecognizer() or getCloudTextRecognizer(). See the code example below.

To use on-device text recognizer:

 FirebaseVisionTextRecognizer textRecognizer =
    FirebaseVision.getInstance().getOnDeviceTextRecognizer();
 

Or use cloud text recognizer:

 FirebaseVisionTextRecognizer textRecognizer =
    FirebaseVision.getInstance().getCloudTextRecognizer();
 

To perform OCR on an image, you first need to create an instance of FirebaseVisionImage from a ByteBuffer, Bitmap, etc. See FirebaseVisionImage documentation for more details. For example, the code below creates a FirebaseVisionImage from a Bitmap.

FirebaseVisionImage image = FirebaseVisionImage.fromBitmap(bitmap);

Then the code below can detect texts in the supplied FirebaseVisionImage.

 Task<FirebaseVisionText> task = textRecognizer.processImage(image);
 task.addOnSuccessListener(...).addOnFailureListener(...);
 

Nested Class Summary

@interface

FirebaseVisionTextRecognizer.RecognizerType

Recognizer types.

Constant Summary

int	CLOUD	Indicates that the recognizer is using a cloud model.
int	ON_DEVICE	Indicates that the recognizer is using an on-device model.

Public Method Summary

void	close() Closes the text detector and release its model resources.
int	getRecognizerType() Gets recognizer type in terms of on-device or cloud.
Task<FirebaseVisionText>	processImage(FirebaseVisionImage image) Detects FirebaseVisionText from a FirebaseVisionImage.

Inherited Method Summary

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

From interface java.io.Closeable

abstract void

close()

From interface java.lang.AutoCloseable

abstract void

close()

Constants

public static final int CLOUD

Indicates that the recognizer is using a cloud model.

Constant Value: 2

public static final int ON_DEVICE

Indicates that the recognizer is using an on-device model.

Constant Value: 1

Public Methods

public void close ()

Closes the text detector and release its model resources.

Throws

IOException

public int getRecognizerType ()

Gets recognizer type in terms of on-device or cloud.

public Task<FirebaseVisionText> processImage (FirebaseVisionImage image)

Detects FirebaseVisionText from a FirebaseVisionImage. The OCR is performed asynchronously. Right now, only the following input types are supported:

For best efficiency, create a FirebaseVisionImage object using one of the following ways:

• fromMediaImage(Image, int) with a YUV_420_888 formatted image from android.hardware.camera2.
• fromByteArray(byte[], FirebaseVisionImageMetadata) with a NV21 formatted image from Camera (deprecated).
• fromByteBuffer(ByteBuffer, FirebaseVisionImageMetadata) if you need to pre-process the image. E.g. allocate a direct ByteBuffer and write processed pixels into the ByteBuffer.

All other FirebaseVisionImage factory methods will work as well, but possibly slightly slower.

Returns

• A Task for FirebaseVisionText.