Remove hint.html and index.html
As per discussions on GitHub the index.html and hint.html files should be deleted in favour of README.md files (from any .text/.txt/.markdown/.md files which will be turned into README.md in an upcoming commit).
This commit is contained in:
Cody Boone Ferguson committed
1 parent
ee8a36310f
commit
77fb0f11a2
143 files changed
-28606
No files matched your search
@@ -1,105 +0,0 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="GENERATOR" content="mkd2html 2.1.5a DL=DISCOUNT">
|
||||
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
|
||||
<link rel="stylesheet"
|
||||
type="text/css"
|
||||
href="../hint.css">
|
||||
<title>Most inflationary</title>
|
||||
</head>
|
||||
<body>
|
||||
<h1>Most inflationary</h1>
|
||||
|
||||
<p>Fabrice Bellard<br>
|
||||
<a href="https://bellard.org/">https://bellard.org/</a></p>
|
||||
|
||||
<h2>Judges' comments:</h2>
|
||||
|
||||
<h3>To use:</h3>
|
||||
|
||||
<pre><code>make
|
||||
./prog > lena.ppm
|
||||
</code></pre>
|
||||
|
||||
<h3>Try:</h3>
|
||||
|
||||
<pre><code>eog lena.ppm # On Linux
|
||||
preview lena.ppm # On MacOS
|
||||
|
||||
wget http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png
|
||||
pngtopnm < Lenna.png | pnmscale 0.25 | cjpeg -arithmetic -dct float -quality 14 > small.jpg
|
||||
</code></pre>
|
||||
|
||||
<p>The file <code>small.jpg</code> will be approximately of the same size as the raw image data
|
||||
in the program. Compare the level of the detail and the artifacts of
|
||||
<code>small.jpg</code> and <code>lena.ppm</code>.</p>
|
||||
|
||||
<h3>Selected Judges Remarks:</h3>
|
||||
|
||||
<p>Compressing images is just a matter of simple arithmetic and some magic, isn’t it?</p>
|
||||
|
||||
<p>We could understand some of the arithmetic but none of the magic.</p>
|
||||
|
||||
<p>Deciphering the mechanism used for data encoding to make use
|
||||
of the whitespaces, braces and semicolons should be a slightly easier task.</p>
|
||||
|
||||
<h2>Author’s comments:</h2>
|
||||
|
||||
<p>This program outputs a 128x128 RGB image file to the standard output
|
||||
using the portable pixmap file format (PPM). It contains the famous
|
||||
“Lena” image which is used in many image compression tests.</p>
|
||||
|
||||
<p>The uncompressed image is 12 times larger than the source code of the
|
||||
program which includes the image data and the complete decoder. The
|
||||
actual image data is 1220 byte long, which gives a compression ratio
|
||||
of 40. Using a JPEG-like algorithm would not be enough to reach this
|
||||
level of compression (the Lena image would be barely recognizable). So
|
||||
the algorithm is based on the latest advances in image compression. It
|
||||
includes the following features:</p>
|
||||
|
||||
<ul>
|
||||
<li>DCT transform with variable block size (4x4, 8x8, 16x16 and 32x32)</li>
|
||||
<li>DC and directional predictors</li>
|
||||
<li>arithmetic coding</li>
|
||||
<li>YCgCo color space.</li>
|
||||
</ul>
|
||||
|
||||
|
||||
<p>The image data is encoded to a C string with some tricks to make the
|
||||
best use of the IOCCC size constraints. The identifiers were shortened
|
||||
to a single letter to save space. No specific obfuscation was needed
|
||||
as the algorithms already have a significant complexity.</p>
|
||||
|
||||
<p>Although the program was optimized to decompress its built-in image,
|
||||
it accepts to decompress image files from its standard
|
||||
input. Examples:</p>
|
||||
|
||||
<pre><code>./prog d < lena512.bin > lena512.ppm
|
||||
./prog d < fruits.bin > fruits.ppm
|
||||
./prog d < vintage_cars.bin > vintage_cars.ppm
|
||||
</code></pre>
|
||||
|
||||
<p>The original images for <a href="https://commons.wikimedia.org/wiki/File%3AFruits_oranges%2C_jardin_japonais_2.JPG">fruits</a> and <a href="https://commons.wikimedia.org/wiki/File%3ARed_Bull_Jungfrau_Stafette%2C_10th_stage_-_vintage_cars_%282%29.jpg">vintage cars</a> come from
|
||||
Wikipedia and were resized to a width of 1024 pixels. Warning: the
|
||||
program is not protected against invalid input.</p>
|
||||
|
||||
<p>The program should be portable on any Unix system. On Windows the line
|
||||
“<em>setmode(0, 32768); </em>setmode(1, 32768);” must be added at the start of
|
||||
the main() function to avoid unwanted carriage return characters in
|
||||
the output.</p>
|
||||
|
||||
<hr />
|
||||
|
||||
<hr />
|
||||
|
||||
<TABLE><TR>
|
||||
<TD><a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/88x31.png" /></a></TD>
|
||||
<TD><P>© Copyright 1984-2018,
|
||||
<A HREF="/judges.html">Leo Broukhis, Simon Cooper, Landon Curt Noll</A>
|
||||
- All rights reserved<BR>
|
||||
This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.</P></TD>
|
||||
<TD> <!--<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>--></TD>
|
||||
</TR></TABLE>
|
||||
</body>
|
||||
</html>
|
||||
Reference in new issue
Block a user