Dynamic Web TWAINRelease Notes

Scanner Core Module
  • Scanner Core Module
  • Optional Addon Modules
How to Upgrade?

14.1 (9/06/2018)


  • [ActiveX| Windows] Improved the SelectSource() method so that it can also be used asynchronously.
  • [File Uploader] Updated the upload module so that the information returned from the server can be accessed in the callback functions of an upload job.
  • [File Uploader] Added the version number of the library to the name of the library so that different versions of the library can co-exist.


  • [HTML5] Fixed a bug with the event OnInternetTransferPercentage which doesn't fire when IfShowCancelDialogWhenImageTransfer is set to false.
  • [HTML5] Fixed a bug with the image editor where it stops responding after you scan or load new images without saving the currently modified image.
  • [HTML5] Fixed a bug with the image editor where it no longer adapts to the size change of the browser window after you pressed the scan button in its toolbar.
  • [HTML5] Fixed a bug that some files would fail to load when you drag and drop multiple TIFF files to load in Dynamic Web TWAIN.
  • [HTML5] Fixed a bug where loading a file from a path that is composed of Unicode characters would fail.
  • [HTML5 | Windows] Fixed a bug where the multi-user service doesn't start under the Enhanced Mode.
  • [HTML5 | macOS] Fixed a bug on macOS where the built-in Select-Source dialog appears to be too wide.
  • [HTML5 | macOS] Fixed a bug on macOS where "Undefined" shows up as available sources.
  • [HTML5 | macOS] Fixed a bug on macOS where you can't press Ctrl to select multiple zones on an image. Instead, you need to use the meta Key.


  • [File Uploader] Changed GenerateURLForUploadData to be an asynchronous method.
  • [File Uploader] Changed the module so that the encrypted files which are in the cache waiting to be uploaded will be cleared when the upload fails or when it is cancelled

Previous Changes >>

It is a light-weighted PDF library working with the Scanner Core module of Dynamic Web TWAIN SDK on the client side to convert text-based PDF files into images and display in the image viewer. (9/06/2018)


  • Added the version number of the library to the name of the library so that different versions of the library can co-exist.
  • Added a method IsModuleInstalled() to detect whether the library has been installed on the client machine.
  • Updated the library to version which is more stable and uses the memory more efficiently. The new library also has fixed a bug where a loaded PDF may appear tilted. (7/17/2018)


  • Fixed the typo EnumDWT_ConverMode to EnumDWT_ConvertMode

10.2 (1/16/2018)


  • Upgraded the current PDF Rasterizer engine for Windows client.


  • Added support for macOS client and Linux client.

9.6 (03/01/2016)


  • Added PDF Rasterizer Add-on to convert text-based PDF files to images. This way, text PDF files can be successfully displayed in the viewer of the Dynamic Web TWAIN Scanner Core module.
  • Available APIs are:
    • Addon.PDF.SetConvertMode: to turn on or off the PDF rasterizer feature.
    • Addon.PDF.Download: to deploy the PDF library from the server side to the client machine.
    • Addon.PDF.SetPassword: set the password to decrypt the targeted PDF file.
    • Addon.PDF.SetResolution: to set the output image resolution.
    • Addon.PDF.IsTextBasedPDF: to detect if a PDF file is text-based or not.

A professional linear & 2D barcode reading library for recognizing barcode image from any document captured from scanners, webcams or file systems.

6.3 (09/18/2018) (Since DWT 14.1)

5.2 (09/18/2017)


  • Improved the localization and recognition algorithms for PDF417 barcodes.
  • Optimized the de-blur algorithm for 1D barcodes to improve the recognition accuracy.
  • Optimized the timeout support. Now it is possible to stop barcode recognition by timeout.
  • Increased QR Code and DataMatrix barcode recognition speed for B&W images.

5.1 (06/20/2017) (since DWT 13.0)


  • Reconstructed the barcode reader SDKs to closely working with the Scanner Core module of the Dynamic Web TWAIN SDK.
  • Added support for reading barcodes from a base64 string image.
  • New de-blur algorithm for 1D barcodes to improve the accuracy when scanning linear barcodes from out-of-focus, blurred images.
  • Added new APIs that enable you to specify page numbers, barcode regions and barcode angles for barcode detection. These greatly improve the decoding workflow and barcode reading efficiency.
  • Added ImageCaptureDevice API to set the capture device (scanner, camera or fax) being used to scan barcode images. When set, it will use a better and more appropriate image processing technique to the images captured from that device.
  • Added BarcodeColorMode API to set the ink color for barcodes searching.
  • Added BarcodeTextEncoding API to set barcode text encoding mode so that you can display special characters properly.
  • Added TimeoutPerPage API to set the maximum amount of time for reading barcodes on one page.
  • Added Angle property to return the rotation angle of a detected barcode.


  • Updated barcode reader library with improved positioning algorithm that can better identify and locate DataMatrix barcodes.

4.3 (10/13/2016) (DWT12.1~12.3.1)


  • New localization algorithm was implemented for 1D barcode scanning to improve barcode reading speed.
  • New multi-thread processing was implemented for 2D barcode reading to improve decoding accuracy.


  • Improved recognition for perspective QR Codes.
  • Optimized decoding performance for large size, special angle and multiple 1D barcodes.
  • Other small fixes and tweaks.

4.2 (04/08/2016) (DWT12.0)


  • Changed 1D barcode decoding module to improve recognition accuracy.

4.1 (01/21/2016) (11.3~11.3.2)


  • Improved positioning algorithm to better identify and localize DataMatrix barcodes.

4.0 (07/23/2015) (11.2)


  • Added CodeBar, Code_93, EAN_8, EAN_13, ITF, UPC_A, UPC_E support to the 1D Barcode Reader module.
  • Added support for PDF417 and DataMatrix.

3.0 (08/13/2015) (DWT11.1)


  • Added support for QR Code and Industrial 2 of 5.

2.0 (07/17/2012) (DWT11.0, internal barcode dll version 9.6)


  • Added support for reading CodeBar, Code_93, EAN_8, EAN_13, ITF, UPC_A, UPC_E.


  • Fixed the bug in the Barcode Reader add-on where barcode location fails for 200 DPI.

1.0 (01/20/2015) (since DWT10.1~10.2, internal barcode dll version 9.5)

Updates in this version include 1D barcode improvements in accuracy and performance for Code 39 and Code128 recognition. Also image preprocessing is improved. For Code 128, the recognition ratio and speed have jumped up by as much as 30 percent.

It is a light-weighted pure JavaScript SDK to enable document capturing via the built-in mobile camera in a web page.

2.0 (06/06/2018)


  • Built-in & customizable image viewer, thumbnail viewer and image editor available.
  • Support embedding video stream into a web page.
  • Support common gestures to navigate or zoom in/out images in the image viewer.
  • Advanced image processing: automatic document border detection and automatic prospective deskew.
  • Input image formats include JPEG, PNG, GIF, BMP and WebP.
  • Output image formats include PDF, TIFF, JPEG, BMP, and PNG.
  • Various compression options available when encoding images as TIFF and PDF.
  • Support uploading images via HTTP(s) Protocol.
  • Support downloading a captured image to the local disk of your device.

1.0 (06/10/2017)


  • Support calling the mobile system API to grab images from the image gallery and device camera.
  • Support viewing captured images in an HTML image viewer.
  • Support basic image editing: Zoom in/out, Rotate, Crop.

It is one of the best OCR engines available in the market. It is designed to work with the Scanner Core module of the Dynamic Web TWAIN. (09/06/2018)


  • [OCR Pro | OCR Basic] Added the version number of the library to the name of the library so that different versions of the library can co-exist.
  • [OCR Pro | OCR Basic] Added a method IsModuleInstalled() to detect whether the library has been installed on the client machine. (07/17/2018)


  • [OCR Pro] Better mechanism to verify the OCR license.

1.0 (07/05/2016)


  • [Windows Only] Added OCR Professional (OCR Pro) module. The module uses Nuance's OCR engine.
  • Added methods Addon.OCRPro.Download, Addon.OCRPro.Recognize, Addon.OCRPro.RecognizeFile, Addon.OCRPro.RecognizeRect, Addon.OCRPro.RecognizeSelectedImages and an OCRResult class to use the OCR Professional seamlessly with Dynamic Web TWAIN on the client-side.
  • Added a feature to Dynamsoft Service for it to accept an OCR Request, do OCR and return the OCR Result. With this feature, the OCR professional SDK can be deployed on the server-side.
  • The OCR Professional module supports multi-thread processing as well as zonal processing.
  • The OCR Professional module supports many more than 30 languages. See a full list ›
  • The OCR Professional module supports extracting text from the following file types: TIFF (G4 / LZW / JPEG), JPEG, PDF, BMP, JPEG2000, JBIG, JBIG2, PNG, PDA, PGX, XPS, WMP, OPG, MAX, AWD, DCX, PCX.
  • The OCR Professional module enables you to save OCR results in the following formats: Searchable PDFs (including PDF/A 1-b). Text over image technology supports multiple image compression formats to reduce the size of PDF files. Text files - TXT, CSV, XML, RTF. String variable.