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OCRFeeder is an optical character recognition suite for GNOME, which also supports virtually any command-line OCR engine, such as CuneiForm, GOCR, Ocrad and Tesseract.It converts paper documents to digital document files and can serve to make them accessible to visually impaired users.
poppler-utils includes command-line tools to extract images from a PDF (pdfimages) and convert a PDF to other formats (pdftohtml, pdftotext, pdftoppm). ps2pdf: GNU AGPL: Yes Part of Ghostscript; converts a PostScript file to a PDF. SWFTools: GNU GPL: Yes pdf2swf component converts PDF to SWF. Scribus: GNU GPL: Yes Open source program for page ...
Impressive is written in the Python programming language, and PyGame is used as the windowing API.Its intended user interface is the command-line. [12]The computer graphics rendering of PDF document slides is delivered by Xpdf, MuPDF or Ghostscript.
Astropy is a collection of software packages written in the Python programming language and designed for use in astronomy. [2] The software is a single, free, core package for astronomical utilities due to the increasingly widespread usage of Python by astronomers, and to foster interoperability between various extant Python astronomy packages. [3]
Python Imaging Library is a free and open-source additional library for the Python programming language that adds support for opening, manipulating, and saving many different image file formats. It is available for Windows, Mac OS X and Linux. The latest version of PIL is 1.1.7, was released in September 2009 and supports Python 1.5.2–2.7. [3]
An edge in an image may point in a variety of directions, so the Canny algorithm uses four filters to detect horizontal, vertical and diagonal edges in the blurred image. The edge detection operator (such as Roberts, Prewitt, or Sobel) returns a value for the first derivative in the horizontal direction (G x) and the vertical direction (G y ...
Poppler is a free and open-source software library for rendering Portable Document Format (PDF) documents. Its development is supported by freedesktop.org . Commonly used on Linux systems, [ 4 ] it powers the PDF viewers of the GNOME and KDE desktop environments .
PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [ 3 ] [ 4 ] It runs on Linux , Windows and macOS . [ 5 ] It comes in three versions: PDFtk Server ( open-source command-line tool ), PDFtk Free ( freeware ) and PDFtk Pro ( proprietary paid ). [ 2 ]