Release Notes - Android 2.x

2.2.20 (09/29/2022)

Version Highlights

• Improved the performance of the MRZ scenario. The recognition speed is improved by about 70%.

• Added character normalization modes to normalize the text. This feature will improve the read rate when processing the text in nonstandard fonts like dot matrix.

• New parameter control and recognition methods are added to fit more usage scenarios.

Changelog

New

• Added methods in LabelRecognizer class to support video streaming recognition.
  • setImageSource: Set the source of image/video.
  • setLabelResultListener: Register a listener to receive label recognizing results.
  • startScanning: Start the label recognizing processes.
  • stopScanning: Stop the label recognizing processes.
• Added methods in LabelRecognizer class to configure settings.
  • initRuntimeSettings
  • initRuntimeSettingsFromFile
  • outputRuntimeSettings
  • outputRuntimeSettingsFromFile
• Added a new recognition method recognizeFileInMemory in LabelRecognizer class.
• Added a protocol LabelResultListener to obtain video label recognition results.
• Added a new parameter timeout to DLRRuntimeSettings class.

Rename

• The following methods of LabelRecognizer class are renamed
  • Renamed recognizeByFile to recognizeFile.
  • Renamed recognizeByBuffer to recognizeBuffer.
  • Renamed recognizeByImage to recognizeImage.
  • Renamed outputSettingsToFile to outputRuntimeSettingsToFile.

Removed

• The following methods of LabelRecognizer class are removed
  • initLicense. The method is replaced by LicenseManager.initLicense under DynamsoftCore.
  • appendSettingsFromString
  • appendSettingsFromFile
  • clearAppendedSettings
  • destory

2.0 (08/26/2021)

Version Highlights

• Added image processing modes to enhance the usage scenarios like MRZ reading:
  • Texture area detection
  • Color Conversion
  • Binarization
  • Grayscale image processing

• Added dictionary-based correction. The dictionary is minimal and customizable to only cover a scenario-oriented vocabulary.

• Improved the overall performance by replacing Caffe engine with OpenCV dnn engine

• Improved the readability of recognizing skewed characters.

• Improved the MRZ reading performance.

• Added a core library. Migrated the core structs/classes from the LabelRecognizer library to the core library.

Changelog

New

• Added auto-deskew algorithm to improve the performance on recognizing the skewed characters.
• Added package DynamsoftCoreAndroid.aar. Migrated the Dynamsoft core classes/enums from package DynamsoftLabelRecognizerAndroid.aar to DynamsoftCoreAndroid.aar.
• Added class BarcodeResult for users to interact with Dynamsoft Barcode Reader SDK.
• Added DLRRuntimeSettings property dictionaryPath and dictionaryCorrectionThreshold for users to further improve the recognizing accuracy by referencing dictionary files.
• Added class DLRDictionaryCorrectionThreshold.
• Added class DLRFurtherModes and property DLRRuntimeSettings.furtherModes for users to config more processing modes.
• Added enumeration TextureDetectionMode and property DLRFurtherModes.textureDetectionModes for users to detect and remove the texture background.
• Added enumeration ColourConversionMode and property DLRFurtherModes.colourConversionModes for users to convert color images to grayscale images in differenct ways.
• Added enumeration BinarizationMode and property DLRRuntimeSettings.binarizationModes for users to convert grayscale images to binary images in different ways.
• Added enumeration GrayscaleEnhancementMode and property DLRFurtherModes.grayscaleEnhancementModes for users to enable grayscale images preprocessing.
• Added characterHConfidence, characterMConfidence and characterLConfidence properties in DLRCharacterResult class so that more alternative results will be available for users.
• Added API recognizeByImage.

Improved

• Improved the neural network performance by replacing Caffe engine with OpenCV DNN engine.

Fixed

• Fixed a bug that might cause wrong line number matching when using LineSpecification.LineNumber.

API Changes

• Modified the method initLicense(String) to static initLicense(String, DLRLicenseVerificationListener).
• Modified the parameter type of the method updateReferenceRegionFromBarcodeResults from TextResult[] to BarcodeResult[].
• Modified the parameters LabelRecognizerParameter.LetterHeightRange and TextArea.LetterHeightRange. The value unit of the parameters are modified from percentage to thousandth. The available range of the value and the default value are updated as well.
• Renamed class LabelRecognition to LableRecognizer.
• Renamed interface DLRLTSLicenseVerificationListener to DLRLicenseVerificationListener.
• Renamed interface method LTSLicenseVerificationCallback to DLRLicenseVerificationCallback.
• Removed method initLicenseFromLTS.
• Removed method LabelRecognizer(string license).
• Removed class DMLTSConnectionParameters.