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Release Notes 1.x - Dynamsoft Label Recognition .Net SDK
This is the release notes page of Dynamsoft Label Recognition for .Net SDK version 1.x.
release notes, .Net
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/programming/dotnet/release-notes/dotnet-1-v1.2.1.html

Release Notes for .Net - 1.x

1.2.1 (06/08/2021)

New

  • Added a new property [products]({{ site.dlr_dotnet_api }}class/dm-lts-connection-parameters.html#products) to DMLTSConnectionParameters.
  • Added a new enumeration [EnumProduct]({{ site.dlr_enumerations }}other-enums.html#product).

Fixed

  • Fixed a bug of license client.

1.2 (05/18/2021)

New

  • Added a new parameter [LabelRecognitionParameter.Timeout]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#timeout). Should the recognition time pass the value of this parameter, a new error code [DLRERR_RECOGNITION_TIMEOUT]({{ site.dlr_enumerations }}error-code.html) will be returned.

  • Added a new parameter [LabelRecognitionParameter.Pages]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#page) that specifies a page or a subset of pages of a single file to run the recognition process on.

  • Added the following error codes: [DLRERR_TIFF_READ_FAILED]({{ site.dlr_enumerations }}error-code.html) , [DLRERR_PDF_READ_FAILED]({{ site.dlr_enumerations }}error-code.html) and [DLRERR_PDF_DLL_MISSING]({{ site.dlr_enumerations }}error-code.html). These error codes will be returned when the recognizer fails to read a TIFF file, a PDF file, or if the PDF DLL is missing, respectively.

  • Added a new property [PageNumber]({{ site.dlr_dotnet-structs }}dlr-result.html#pagenumber) to DLR_Result to identify the page on which the result is located.

  • Added parameters TextStringLengthRange and LineStringLengthRange that can be used to define the minimum and maximum string length when running the recognition process on a text area or a specific line, respectively. They are available as:

    • [LabelRecognitionParameter.TextStringLengthRange]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#textstringlengthrange)
    • [LabelRecognitionParameter.LineStringLengthRange]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#linestringlengthrange)
    • [TextArea.TextStringLengthRange]({{ site.dlr_parameters_reference }}text-area/parameter-control.html#textstringlengthrange)
    • [TextArea.LineStringLengthRange]({{ site.dlr_parameters_reference }}text-area/parameter-control.html#linestringlengthrange)
    • [LineSpecification.LineStringLengthRange]({{ site.dlr_parameters_reference }}line-specification/parameter-control.html#linestringlengthrange)

  • Added a new parameter MaxLineCharacterSpacing to limit the spacing between characters treated as one line. They are available as:

    • [LabelRecognitionParameter.MaxLineCharacterSpacing]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#maxlinecharacterspacing)
    • [TextArea.MaxLineCharacterSpacing]({{ site.dlr_parameters_reference }}text-area/parameter-control.html#maxlinecharacterspacing)

  • Added parameters [LineSpecification.FirstPoint]({{ site.dlr_parameters_reference }}line-specification/parameter-control.html#firstpoint), [LineSpecification.SecondPoint]({{ site.dlr_parameters_reference }}line-specification/parameter-control.html#secondpoint), [LineSpecification.ThirdPoint]({{ site.dlr_parameters_reference }}line-specification/parameter-control.html#thirdpoint), and [LineSpecification.FourthPoint]({{ site.dlr_parameters_reference }}line-specification/parameter-control.html#fourthpoint) to specify the coordinates of a line.

  • Added a new API [AppendSettingsFromFile]({{ site.dlr_dotnet_api }}label-recognition/settings.html#appendsettingsfromfile) to allow appending settings directly from a JSON file.

Improved

  • Improved the recognition performance.

  • Improved the regular expression parameter by supporting more [RegEx pattern syntaxes]({{ site.dlr_parameters_reference }}label-recognition-parameter/parameter-control.html#textregexpattern).

  • Improved the recognition accuracy when dealing with skewed and italics characters.

  • Improved the recognition accuracy for serif fonts.

1.0 (02/24/2021)

  • Supports recognition of A-Z, a-z, 0-9, ., -, _, (blank space), / and : characters.
  • Supports text recognition from BMP, JPEG, PNG and single-page TIFF files.
  • Supports zonal OCR and provides three ways to localize text areas:
    • Pre-define an area manually in pixel or percentage.
    • Specify an area relative to the barcode zone, which allows you to recognize accompanying texts near the barcode.
    • Specify an area relative to blocks which share the same colour or uses the same font colour. A common example would be a price tag, where the text of interest is always on a yellow square background, the yellow square can serve as the reference region.
  • Supports specifying a regular expression to improve recognition accuracy and robustness.