linux网页视频黑边,unpaper扫描图片纠偏去黑边linux

unpaper - post-processing scanned and photocopied book pages

Licensed under the GNU General Public License (GPL). This software

comes with no warranty.

Written by Jens Gulden 2005-2007

- [email protected].

unpaper is a post-processing tool for scanned sheets of paper, especially for

book pages that have been scanned from previously created photocopies.

The main purpose is to make scanned book pages better readable on screen

after conversion to PDF. Additionally, unpaper might be useful to enhance

the quality of scanned pages before performing optical character recognition

(OCR).

unpaper tries to clean scanned images by removing dark edges that appeared

through scanning or copying on areas outside the actual page content (e.g.

dark areas between the left-hand-side and the right-hand-side of a double-

sided book-page scan).

The program also tries to detect disaligned centering and rotation of pages

and will automatically straighten each page by rotating it to the correct

angle. This process is called "deskewing".

Note that the automatic processing will sometimes fail. It is always a good

idea to manually control the results of unpaper and adjust the parameter

settings according to the requirements of the input. Each processing step can

also be disabled individually for each sheet.

Input and output files can be in either .pbm , .pgm or .ppm format, thus

generally in .pnm format, as also used by the Linux scanning tools scanimage

and scanadf.

Conversion to PDF can e.g. be achieved with the Linux tools pgm2tiff, tiffcp

and tiff2pdf.

Source-only versions and older releases are available in the distribution archive of the project development site.

Usage: unpaper [options] Filenames may contain a formatting placeholder starting with '%' to insert a

page counter for multi-page processing. E.g.: 'scan%03d.pbm' to process files

scan001.pbm, scan002.pbm, scan003.pbm etc.

Read more http://unpaper.berlios.de