Posts Tagged ‘document imaging’

Deskew/Autodeskew : what’s that ?

Hi folks,

This week we thought about offering to our general public some explanations about deskew/autodeskew, mainly to answer two questions : what’s that and why is it important to have ?

Skew is an artifact that might appear during document scaning process and it consists of getting the document’s text/images be rotated at a slight angle.
It can have various causes but the most common is paper getting misplaced during scan.
Therefore, deskew is the process of detecting and fixing this issue on scanned files (ie, bitmap) so deskewed images will have the text/images correctly and horizontally alligned.

And why is this important ?
Well, a first benefit will be that you don’t have to scan in again the skewed documents.
Instead of the mechanical and time consuming actions that re-scan involves, everything is done automatically and efficiently by the software providing deskew feature.

But there is yet another important benefit of deskewing : for those who need to OCR the scanned documents, deskew is an important correction to do before submiting to OCR process.
Deskew increases the rate of character recognition accuracy because alligned text is much closer to what the OCR software is supposed to encounter when performing image analysis.

All our products, SDKs (GdPicture.NET) and general public products (PaperScan and PaperLight BETA) provides the autodeskew feature as it is a must-have for any professional document imaging software.



Document without PaperScan autodeskew

Document without PaperScan autodeskew

Document with PaperScan autodeskew

Document with PaperScan autodeskew

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Daddy's Boy

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About JBIG2 compression

Hello folks,

Although disk storage and internet connection bandwidth are constantly increasing and getting cheaper, worldwide efforts for better file compression are increasing as well.
This is no paradox and there are too many reasons for this to mention but we all know that, for instance, file transfers are never fast enough.

For document imaging domain there is JBIG2 compression scheme.
JBIG2 is an acronym for “Joint Bilevel Imaging Group 2“.
JBIG2 compression results are incredible and perfectly suited for efficient storage and greater speed of transmission: sometime 10x better than TIFF G3, G4, or JBIG (also known as JBIG1).
Technical details are beyond the scope of this article, you can find some in the dedicated Wikipedia article and more from the official website, of course.

Users handling big archives (compared to existing storage space), users applying the good practice of maintaining a document/image archives backup or users who simply prefer faster transfers via email or file sharing apps. might be interested in such a performant compression rate.
Resulting images are black and white (bi-level) but all the information is there and it’s up to ten times smaller. And ten times faster to share.

This is why we have included JBIG2 file format support in all our software products (SDK and end-user products).
We issued this article because we feel that JBIG2 is still relatively unknown to general public.
And it surely deserves better.

Our end-user products:


Free Home PRO

View JBIG2 files (single and multipage .jb2)
yes yes yes
View PDF files with embedded JBIG2 encoded bitmap
yes yes yes
Save as single page JBIG2 file (.jb2) or PDF with embedded JBIG2 bitmap
yes yes yes
Save as multipage JBIG2 file (.jb2) or PDF with embedded JBIG2 bitmap
no yes yes

Our GdPicture.NET SDK:

All GdPicture.NET SDK Editions (except for “Document Viewer SDK”, the minimal one), allow developers -through the optional JBIG2 Encoder plugin – to quickly and easily add to their apps JBIG2 related features such as read, write, view JBIG2 files or PDF files embedding JBIG2 encoded bitmap.
The GdPicture.NET Ultimate SDK Edition license unlocks all features and plugins, including the JBIG2 Encoder plugin.



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