Release Notes - C/C++ 2.x

2.2.20 (09/29/2022)

New

• Added new methods
  • DLR_InitRuntimeSettingsFromFile
  • DLR_InitRuntimeSettings
  • DLR_SetCharacterModelDefaultPath
  • DLR_FreeString

Renamed

• The following methods are renamed
  • Renamed DLR_OutputSettingsToFile to DLR_OutputRuntimeSettingsToFile
  • Renamed DLR_OutputSettingsToString to DLR_OutputRuntimeSettingsToString
  • Renamed DLR_RecognizeByBuffer to DLR_RecognizeBuffer
  • Renamed DLR_RecognizeByFile to DLR_RecognizeFile

Removed

• The following methods are removed
  • DLR_InitLicense. The method is replaced by DC_InitLicense under DynamsoftCore.
  • DLR_AppendSettingsFromString
  • DLR_AppendSettingsFromFile
  • DLR_ClearAppendedSettings
  • DLR_UpdateRuntimeSettingsFromString

2.2.10 (06/21/2022)

Changelog

• Reduced the size of MRZ model from 10MB to 2.56MB.
• Improved single-line text confidence. This enables users to implement a result confidence filter to improve the recognition accuracy.
• Improved character segmentation when processing some connected characters. This improves the recognition accuracy.

2.2.2 (03/03/2022)

Changelog

Fixed

• Fixed a bug that might cause incorrect regular expression matching.
• Fixed a bug that might output incorrect MRZ results.

2.2 (11/30/2021)

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 a new method DLR_UpdateRuntimeSettingsFromString for users to upload runtime settings from stringified JSON data.
• Added a new method DLR_OutputSettingsToString for users to output runtime settings to stringified JSON data.
• Added a new method DLR_RecognizeFileInMemory to recognize from a file in the memory.
• Added a new method UpdateRuntimeSettingsFromString for users to upload runtime settings from stringified JSON data.
• Added a new method OutputSettingsToString for users to output runtime settings to stringified JSON data.
• Added a new method RecognizeFileInMemory to recognize from a file in the memory.
• Added modes parameter CharacterNormalizationModes to normalize the text. The parameter is available under the following classes:
  • LabelRecognizerParameter
  • TextArea
  • LineSpecification

2.0 (08/26/2021)

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 header file DynamsoftCore.h to replace the header file DynamsoftCommon.h. All the core structs/enums in DynamsoftLabelRecognizer.h and DynamsoftCommon.h are migrated to the header file DynamsoftCore.h.
• Added struct BarcodeResultArray and BarcodeResult for users to interact with Dynamsoft Barcode Reader SDK.
• Added DLR_RuntimeSettings property dictionaryPath and dictionaryCorrectionThreshold for users to further improve the recognizing accuracy by referencing dictionary files.
• Added struct DLR_DictionaryCorrectionThreshold.
• Added struct DLR_FurtherModes and property DLR_RuntimeSettings.furtherModes for users to config more processing modes.
• Added enumeration TextureDetectionMode and property DLR_FurtherModes.textureDetectionModes for users to detect and remove the texture background.
• Added enumeration ColourConversionMode and property DLR_FurtherModes.colourConversionModes for users to convert color images to grayscale images in differenct ways.
• Added enumeration BinarizationMode and property DLR_RuntimeSettings.binarizationModes for users to convert grayscale images to binary images in different ways.
• Added enumeration GrayscaleEnhancementMode and property DLR_FurtherModes.grayscaleEnhancementModes for users to enable grayscale images preprocessing.
• Added charaterHConfidence, charaterMConfidence and charaterLConfidence properties in DLRCharacterResult struct so that more alternative results will be available for users.

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 function DLR_InitLicense(void*, const char*) to DLR_InitLicense(const char*,char errorMsgBuffer[], const int errorMsgBufferLen) (C).
• Modified the method InitLicense(const char*) to static InitLicense(const char*,char errorMsgBuffer[] = NULL, const int errorMsgBufferLen = 0) (C++).
• Modified the first parameter type of the method UpdateReferenceRegionFromBarcodeResults from TextResultArray to BarcodeResultArray.
• 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 CLabelRecognition to CLabelRecognizer.
• Renamed function DLR_GetAllDLRResults to DLR_GetAllResults.
• Renamed function DLR_FreeDLRResults to DLR_FreeResults.
• Renamed method GetAllDLRResults to GetAllResults.
• Renamed method FreeDLRResults to FreeResults.
• Renamed enum DLRLocalizationSourceType to LocalizationSourceType.
• Renamed struct DLRReferenceRegion to DLR_ReferenceRegion.
• Renamed struct DLRRuntimeSettings to DLR_RuntimeSettings.
• Renamed struct DLRCharacterResult to DLR_CharacterResult.
• Renamed struct DLRLineResult to DLR_LineResult.
• Renamed struct DLRResult to DLR_Result.
• Renamed struct DLRResultArray to DLR_ResultArray.
• Removed function DLR_InitLicenseFromLTS.
• Removed function DLR_InitLTSConnectionParameters.
• Removed struct DM_LTSConnectionParameters.