TextRecognizer

public final class TextRecognizer extends Detector<TextBlock>

Finds and recognizes text in a supplied Frame.

Build new TextRecognizer instances using TextRecognizer.Builder.

Recognition results are returned by detect(Frame). The OCR algorithm tries to infer the text layout and organizes each paragraph into TextBlock instances. If any text is detected, at least one TextBlock instance will be returned.

Adding the ocr functionality dependency to your project's AndroidManifest.xml will indicate to the installer that it should download the dependency on application install.

Nested Class Summary

class

TextRecognizer.Builder

TextRecognizer Builder.

Public Method Summary

SparseArray<TextBlock>	detect(Frame frame) Detects and recognizes text in a image.
boolean	isOperational() Indicates whether the detector has all of the required dependencies available locally in order to do detection.
void	release() Shuts down the detector, releasing any underlying resources.

Inherited Method Summary

From class com.google.android.gms.vision.Detector

abstract SparseArray<TextBlock>	detect(Frame frame) Analyzes the supplied frame to find target item instances (e.g., the face detector finds faces).
boolean	isOperational() Indicates whether the detector has all of the required dependencies available locally in order to do detection.
void	receiveFrame(Frame frame) Pipeline method (see class level documentation above) for receiving frames for detection.
void	release() Shuts down the detector, releasing any underlying resources.
boolean	setFocus(int id) Sets the ID of the detected item in which to exclusively track in future use of the detector.
void	setProcessor(Processor<TextBlock> processor) Pipeline method (see class level documentation above) which sets the Detector.Processor instance.

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()

Public Methods

public SparseArray<TextBlock> detect (Frame frame)

Detects and recognizes text in a image. Only supports bitmap and NV21 for now.

Returns

• mapping of int to TextBlock, where the int domain represents an opaque ID for the text block.

public boolean isOperational ()

Indicates whether the detector has all of the required dependencies available locally in order to do detection.

When an app is first installed, it may be necessary to download required files. If this returns false, those files are not yet available. Usually this download is taken care of at application install time, but this is not guaranteed. In some cases the download may have been delayed.

If your code has added a processor, an indication of the detector operational state is also indicated with the detectorIsOperational() method. You can check this in your app as it processes detection results, and can convey this state to the user if appropriate.

Returns

• true if the detector is operational, false if the dependency download is in progress

public void release ()

Shuts down the detector, releasing any underlying resources.