Best deskew software for free download

Automatically process thousands of images per hour, group image batches by coverpage barcode, rename files by the barcode value, clean up (despeckle, remove border, noise, crop, autorotate) images, prepare PDF files for customer delivery
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Recognize Code 39 Code 128 PDF417 DataMatrix and more from images in .NET VB C++ Delphi. ClearImage COM is for applications requiring high accuracy and speed, and read poor quality scanned or faxed images. Automatfic batch image repair
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Use SimpleQC to quickly review scanned multi-page documents in a thumbnail view. 2 thumbnail views let you preview files in one pane and pages within the selected file in the other, and quickly rescan, deskew, despeckle, rotate or delete pages.
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Full-featured batch image, graphics, and photo editing and converter software for 140+ formats (JPG, JPEG2000, PDF, etc). Complete command-line operation and an entire arsenal of editing features (batch resize, flip, rotate, crop, trim and much more)
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VintaSoftTwain.NET Library is a pure .NET library which allows to control work of scanners, cameras and any other TWAIN devices. With this library you can fully control the image acquisition process, use the automatic document feeder, clean up images using noise removal, auto border crop, blank page detection. Acquired images can be saved to local disk or into table of SQL database, images also can be uploaded onto Web or FTP server. Library was tested and has examples of use in: MS VB.NET, MS C#, Borland Delphi 8.0, Borland C# Builder, ASP.NET.
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Easily develop production applications, in VB, C++ or Delphi, to automatically improve the appearance of scanned, faxed or captured images. Read images in TIFF, JPG, Grayscale and Color. Use the high level power of ClearImage Repair to standardize the appearance and size of the images and to remove annoying artifacts. Archive high quality images that support further data capture via OCR, or Key From Image. Setup the batch process and let the software determine what needs to be done and to what degree.

ClearImage Repair is a comprehensive software tool for windows, used by professional imaging application vendors, that executes the following operations in an automatic manner, without operator intervention:

Automatic Deskew - detect the skew angle (+/- 45 deg) of the image contents and rotate the image.
Automatic Rotation - Rotate the image so that it is pointing straight upwards.
Automatic Crop - identify the contents of the image and draw a new, tight border around it
Automatic Registration - align the image towards the top left corner
Automatic Border Extract - Remove excess border, deskew and crop the image
Automatic Invert - reverse black and white
Smart Block Invert - reverse black header blocks with white text
Noise Cleanup - Remove noise artifacts and reduces output file size by over 2x.
Remove Punch Holes - Remove black hole marks from the image
Remove Halftone - Remove the halftone pixels to make the area white
Smooth Characters - Remove pixel stubble from the character symbols
Remove Blank Fax Lines - Remove white lines that run through the fax
Remove Fax Header - Remove the top text header from the page
Convert Fax Resolution from Standard to Fine - with image smoothing
Delete Lines and Repair Objects - Remove form lines and reconnect broken objects.
Reconstruct Lines - straighten lines that are jagged due to scanning artifacts
Image I/O - Accept and output images in many file formats, via memory transfers or from Windows Bitmap
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Deskew is the preprocessing operation of removing skew from images (especially bitmaps created using a scanner).

Skew is an artifact that can occur in scanned images because of the camera being misaligned, imperfections in the scanning or surface, or simply because the paper was not placed completely flat when scanned.

DeskewHelper allows automatic skew detection and correction.

Skew detection and correction is a very important problem when an OCR algorithm tries to detect and interpret characters from the source document. Many different solutions have been developed. The stage in which the skew detection takes place also varies from the first to the very last one before the OCR phase.

The document structure analysis and character recognition are usually done in several phases: scanning and thresholding, image enhancement, skew detection and correction, segmentation, classification and character recognition. Each step must be completed well enough for the performance of the sequence and result to be successful. Steps that follow the skew correction are inefficient if the correction fails.

The steps used to deskew an image are:
Calculate the slope of the document
Compute the rotation angle
Calculate the size of a new image large enough to hold the rotated image
Allocate the new image
Rotate the entire image

Please test the speed and accuracy of DeskewHelper by downloading the demo application! DeskewHelper expects as input a monochrome image.
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A-PDF Deskew provides a quick way to correct the skew scanned image in Acrobat PDF documents directly. It detects tilt images and straightens them automatically.A-PDF Deskew’s features include processing a batch of PDF file, even working with password protected files; filtering small images which may be a logo or else; and dealing out some page only to speed the processing.A-PDF Deskew does NOT require Adobe Acrobat, and produces documents compatible with Adobe Acrobat Reader Version 5 and above.Please note: A-PDF Deskew works only with the scanned text-print PDF file. Other image such a picture or photo may be caused error.
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