Preprocess Images & Documents for OCR

GdPicture.NET Image SDKs include several sophisticated document imaging filters to repair and enhance the quality of digital documents whether they are bitonal or colored.
These filters are, for example, useful for better and faster OCR / OMR / Barcode detection processing and to reduce the size of the document produced.

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GdPicture.NET Document Image Processing: Features
  • Auto-deskew or easily retrieve the skew angle of an image.
  • Automatic punch hole removal.
  • Automatic blob removal.
  • Automatic text invert.
  • Automatic invert negative documents.
  • Forms dropout.
  • Automatic white borders removal.
  • Automatic black border removal.
  • Automatic border removal (detects any color).
  • Sophisticated lines removal filter.
  • Page orientation detection.
  • Noise removal filters.
  • Blank page detection.
  • Page color detection (bitonal, grayscale, color, or indexed color).

Examples of usage

Deskewing images.

Removing lines.

Removing punch holes.

Auto invert negative documents.

General noise clean up.

Connected characters and oversampled characters.

Low sampled characters: How to use Black Dilation.

GdPicture.NET Document Image Processing: Punch Holes Removing Example
GdPicture.NET - How to use

How to use

Download and install GdPicture.NET package from here.

You will find some compiled demo applications in
[Install directory]\samples\Bin\

You will find C# and VB.NET demo applications including source code in
[Install directory]\samples\WinForm\

You will find other code snippets within the online reference guide found here

GdPicture.NET Guides

You can find some discussions about TIFF manipulation in the dedicated Image Processing section of our community forums located here

Image Processing & Document Imaging

Check our other Imaging technologies

PDF viewer

Document Viewing

Printing

Document Printing

Document Image Processing

Document Image Processing

Image Processing and Filters

Image Processing and Filters

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