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<html>
<body bgcolor=ffffe4>
<head>
<meta>
<script src="http://www.google-analytics.com/urchin.js"
type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-144810-1";
urchinTracker();
</script>
</meta>
<style>
img.format1 { border: solid 2px gray; padding: 5px;}
</style>
</head>
<h1 align=center>
<img src="figs/Leptonica-yellow.jpg">
</h1>
<hr>
<h2 align=center>
<img class="format1" src="figs/moller52.jpg" >
</h2>
<center><b>Updated: Dec 24, 2025</b></center>
<hr>
<h2>
<b><i> Leptonica </i> is a pedagogically-oriented open source library
containing software that is broadly useful for image processing
and image analysis applications.</b>
<h2>
<b>The official distribution, including all releases, is on GitHub:
<A href="https://github.com/danbloomberg/leptonica" target=_blank>
github.com/danbloomberg/leptonica</A>. </b>
<p>
<i>Featured operations</i> are
</h2>
<h3>
<ul>
<li> Rasterop (a.k.a. bitblt)
<li> Affine transformations (scaling, translation, rotation, shear)
on images of arbitrary pixel depth
<li> Binary and grayscale morphology, rank order, and convolution
<li> Seedfill and connected components
<li> Image transformations combining changes in scale and pixel depth
<li> Pixelwise masking, blending, enhancement, arithmetic ops, etc.
</ul>
</h3>
<p>
<h2>
<i>Ancillary operations</i> include
</h2>
<h3>
<ul>
<li> I/O for standard image formats
<li> Utilities to handle arrays of image-related data types
<li> Utilities for generic stacks, queues, heaps and lists;
and for byte queues and arrays of numbers and strings
</ul>
</h3>
<p>
<h2>
<i>Example applications</i> include
</h2>
<h3>
<ul>
<li> Octcube-based color quantization, with and without dithering
<li> Modified median-cut color quantization, with and without dithering
<li> Skew determination of text images
<li> Segmentation of page images with mixed text and images
<li> jbig2 unsupervised classifier
<li> Border representations of 1 bit/pixel images and raster
conversion for SVG
<li> PostScript generation (levels 1, 2, 3) of images for
device-independent output
<li> PDF generation (levels 1, 2) of images for device-independent output
<li> Dewarping images of text taken with a camera
<li> Book-adaptive text recognition
<li> Rendering text on an image
<li> Connectivity-preserving thinning and thickening of 1 bit/pixel images
<li> Line removal from a grayscale sketch
<li> Search for least-cost paths on binary and grayscale images
</ul>
</h3>
<p>
<h2>
<i>Reference documentation for users</i>
</h2>
<h3>
<ul>
<li> The Leptonica image processing and analysis source code comes
with a very weakly restricted
<A href= "about-the-license.html" target="_blank">
copyright license</A>.
<li> The <A href="source/README.html" target=_blank> README</A>
gives an overview of installation and usage, with a brief
description of the library contents.
<li> A page of brief notes on <A href="source/version-notes.html">version
changes</A>.
<li> A high-level view of the <A href="highlevel.html">source
files</A> in the library.
<li> For a deeper look into specific components of the library,
see the web pages linked from the
<A href="local-sources.html">image processing</A> page.
<li> Over 10 years ago, Tom Powers built the
<A href="http://tpgit.github.io/UnOfficialLeptDocs/leptonica/index.html" target="_blank"> <b>Unofficial Leptonica Documentation</b>.</A>
This documentation contains anecdotes and information about
algorithmic approaches in readable form. However, the README
and other information about the software is based on
version 1.68, and is far out of date. The ancient versions
of leptonica referred to in those pages have not been supported
for over a decade.
<li> Uncompleted sets of <A href="library-notes.html"> somewhat detailed
usage notes </A> and a <A href="library-overview.html">
lightweight overview</A> have been attempted but are unlikely
to be completed anytime in the current millenium.
<li> The final arbiter is, of course, the source itself.
</ul>
</h3>
<p>
<h2>
<i>Source download</i><br>
</h2>
<h3>
<ul>
<li> Click <A href="download.html">here</A> to download
the source.
[<b><font color=FF0000> update: Dec 24, 2025 </font></b>]
<li> See <A href="local-sources.html#PUBS">here</A> for further
information about the source code.
</ul>
</h3>
<p>
<h2>
<i>Fun stuff</i><br>
</h2>
<h3>
<ol>
<li> What is the origin of the name <A href= "about-the-name.html">
Leptonica</A>?<br><br>
<li> <A href= "local-sources.html"> Image processing</A> at this site
[<b><font color=FF0000> update: Dec 24, 2025 </font></b>]
<br><br>
<li> Some issues in <A href="design-principles.html"> software design</A>
<br><br>
<li> A primer on <A href= "particle-primer.html"> particle physics</A>
<br><br>
<li> A small collection of <A href= "interesting-links.html">
interesting links</A>
<br><br>
<li> <A href="broadband.html"><i>Broadband for Dummies</i></A>:
a primer for safely using the internet with windows
</ol>
</h3>
<h2>
Contact: Dan Bloomberg (bloomberg <i>"at"</i> ieee <i>"dot"</i> org) for
questions and suggestions
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<hr>
<h3>
© Copyright 2001-2024, Leptonica
</h3>
</body>
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