http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=DCT_compression 2026-05-14T12:37:35Z Revision history for this page on the wiki MediaWiki 1.19.2 http://fileformats.archiveteam.org/index.php?title=DCT_compression&diff=23739&oldid=prev 2015-11-11T19:11:46Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 19:11, 11 November 2015</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|subcat=<del class="diffchange diffchange-inline">Graphics</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|subcat=<ins class="diffchange diffchange-inline">Compression</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>'''DCT compression''' (Discrete cosine transform) is a compression technique used for images and audio. It is used in [[JPEG]] and (in a modified form) [[MP3]], where it provides lossy compression (meaning that some detail is lost).</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>'''DCT compression''' (Discrete cosine transform) is a compression technique used for images and audio. It is used in [[JPEG]] and (in a modified form) [[MP3]], where it provides lossy compression (meaning that some detail is lost).</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 13:</td> <td colspan="2" class="diff-lineno">Line 13:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/jpeg/dct.htm Description of DCT as used in JPEG]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/jpeg/dct.htm Description of DCT as used in JPEG]</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:Graphics]]</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Audio and Music]]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Audio and Music]]</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">[[Category:Compression]]</del></div></td><td colspan="2">&#160;</td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=DCT_compression&diff=15581&oldid=prev 2014-01-05T14:02:25Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 14:02, 5 January 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Graphics</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Graphics</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>'''DCT compression''' (Discrete cosine transform) is a compression technique used for images and audio. It is used in [[JPEG]] and [[MP3]], where it provides lossy compression (meaning that some detail is lost).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>'''DCT compression''' (Discrete cosine transform) is a compression technique used for images and audio. It is used in [[JPEG]] and <ins class="diffchange diffchange-inline">(in a modified form) </ins>[[MP3]], where it provides lossy compression (meaning that some detail is lost)<ins class="diffchange diffchange-inline">.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&#160;</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The audio format known as [[DCT]] is, however, not related; that abbreviation comes from &quot;dictation&quot;. That format can use a variety of codecs including MP3, meaning that it might or might not happen to use the compression technique with the same initials</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td></tr> </table>

Dan Tobias http://fileformats.archiveteam.org/index.php?title=DCT_compression&diff=15578&oldid=prev 2014-01-05T13:53:50Z

<p>‎<span dir="auto"><span class="autocomment">Links</span></span></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 13:53, 5 January 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 7:</td> <td colspan="2" class="diff-lineno">Line 7:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>== Links ==</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Discrete cosine transform|Wikipedia article: Discrete cosine transform]]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Discrete cosine transform|Wikipedia article: Discrete cosine transform]]</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [http://vision.arc.nasa.gov/publications/mathjournal94.pdf Image Compression Using the Discrete</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [http://vision.arc.nasa.gov/publications/mathjournal94.pdf Image Compression Using the Discrete Cosine Transform (NASA)]</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Cosine Transform (NASA)]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.lokminglui.com/dct.pdf Image Compression and the Discrete Cosine Transform]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.lokminglui.com/dct.pdf Image Compression and the Discrete Cosine Transform]</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/jpeg/dct.htm Description of DCT as used in JPEG]</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/jpeg/dct.htm Description of DCT as used in JPEG]</div></td></tr> </table>

Dan Tobias http://fileformats.archiveteam.org/index.php?title=DCT_compression&diff=15577&oldid=prev 2014-01-05T13:53:37Z

<p>Created page with &quot;{{FormatInfo |formattype=electronic |subcat=Graphics }} &#039;&#039;&#039;DCT compression&#039;&#039;&#039; (Discrete cosine transform) is a compression technique used for images and audio. It is used in [...&quot;</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |formattype=electronic<br /> |subcat=Graphics<br /> }}<br /> '''DCT compression''' (Discrete cosine transform) is a compression technique used for images and audio. It is used in [[JPEG]] and [[MP3]], where it provides lossy compression (meaning that some detail is lost).<br /> <br /> == Links ==<br /> * [[Wikipedia:Discrete cosine transform|Wikipedia article: Discrete cosine transform]]<br /> * [http://vision.arc.nasa.gov/publications/mathjournal94.pdf Image Compression Using the Discrete<br /> Cosine Transform (NASA)]<br /> * [http://www.lokminglui.com/dct.pdf Image Compression and the Discrete Cosine Transform]<br /> * [http://www-cs-faculty.stanford.edu/~eroberts/courses/soco/projects/data-compression/lossy/jpeg/dct.htm Description of DCT as used in JPEG]<br /> <br /> [[Category:Audio and Music]]<br /> [[Category:Compression]]</div>

Dan Tobias