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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2006-12-25 03:06:05 +0000 |
| commit | 1017cbebe5d5edd859e0fddad0a8600f509f4821 (patch) | |
| tree | 78bdf336648566f7a7d55f42837357dea3dd674c /pgmdeshadow.html | |
| parent | 16f2ac126651015a376eba864a3a35f738b0b25a (diff) | |
| download | netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.gz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.tar.xz netpbm-mirror-1017cbebe5d5edd859e0fddad0a8600f509f4821.zip | |
Place user guide into Subversion repository
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@181 9d0c8265-081b-0410-96cb-a4ca84ce46f8
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| -rw-r--r-- | pgmdeshadow.html | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/pgmdeshadow.html b/pgmdeshadow.html new file mode 100644 index 00000000..6b54f7e6 --- /dev/null +++ b/pgmdeshadow.html @@ -0,0 +1,77 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML><HEAD><TITLE>Pgmdeshadow User Manual</TITLE></HEAD> +<BODY> +<H1>pgmdeshadow</H1> +Updated: 06 July 2006 +<p> + +<A HREF="#index">Table Of Contents</A> + +<H2>NAME</H2> + +pgmdeshadow - Deshadow a PGM image + +<H2 id="synopsis">SYNOPSIS</H2> + +<B>pgmdeshadow</B> + +[<I>pnmfile</I>] + + +<H2 id="description">DESCRIPTION</H2> + +<p>This program is part of <a href="index.html">Netpbm</a>. + +<p><b>pgmdeshadow</b> removes gray shadows from an image. This is +useful for an image containing text, such as a scanned book pages, +where a shadow typically appears near the book crease or near one side +of the image. <b>pgmdeshadow</b> recognizes a gray shadow as an area +of smoothly changing color, starting from the outer edges of the +image. The program uses a simple image reconstruction algorithm to +determine the local shadow gray level, then divides each pixel's gray +level by the local shadow gray level. + +<p>The algorithm is the "fast hybrid grayscale reruction" +algorithm from Luc Vincent, "Morphological Grayscale Reruction in +Image Analysis: Applications and Efficient Algorithms. + + +<H2 id="options">OPTIONS</H2> + +<p>None. + +<H2 id="references">REFERENCES</H2> + +<ul> + +<li>Luc Vincent, "Morphological Grayscale Reruction in Image +Analysis: Applications and Efficient Algorithms," IEEE +Transactions on Image Processing, vol. 2, no. 2, April 1993, +pp. 176-201. + +</ul> + + +<H2 id="seealso">SEE ALSO</H2> + +<A HREF="ppmshadow.html">ppmshadow</A>, +<A HREF="pgm.html">pgm</A> + +<h2 id="history">HISTORY</h2> + +<P><b>pgmdeshadow</b> was added to Netpbm in Version 10.35 (August 2006). + + +<HR> +<H2 id="index">Table Of Contents</H2> +<UL> +<LI><A HREF="#synopsis">SYNOPSIS</A> +<LI><A HREF="#description">DESCRIPTION</A> +<LI><A HREF="#options">OPTIONS</A> +<LI><A HREF="#references">REFERENCES</A> +<LI><A HREF="#seealso">SEE ALSO</A> +<LI><A HREF="#history">HISTORY</A> +</UL> + +</BODY> +</HTML> |