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

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.