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JPEG DCT, Discrete Cosine Transform (JPEG Pt2)- Computerphile

Computerphile · 697.7K views · 2015-05-22 · 15:12

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Overview

Mike Pound explains the discrete cosine transform and how it underpins JPEG compression. It is part two of Computerphile's JPEG series.

On Hacker News

HN recommends it as an easy, clear intro to the DCT that finally made it click for several commenters.

Recommended by 6 HN people across 6 months · HN mentions 2015–2026

Topics

Information theory & signal processingComputer vision, speech & NLP
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jpegdiscrete cosine transformcompressionmike poundcomputerphile

What people said

netsharc · 2026-07 · Strong recommendation

There's a series of videos showing the algorithm: [LINK] I finally understood DCT after watching [VIDEO] And someone created a "JPEG to PNG" tool that "finds the smoothest possible picture that encodes to the given JPEG file": [LINK] . I tried it with some very terribly compressed images, and the outputs were a lot better.

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itishappy · 2024-04 · Recommendation

It receives information about the spacial frequency content of the image. If you're unfamiliar, it's definitely worth looking into the specifics of how this works, as it's quite impressive! Here's a few relevant Wikipedia articles, and a Computerphile video: [LINK] [LINK] [VIDEO]

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boolemancer · 2023-12 · Recommendation

There is a good video[1] from the Computerphile channel describing the concept in the context of JPEG. [1] [VIDEO]

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Sources

Video by Computerphile, played through YouTube.

Data and selection notes

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