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Old 26th May 2015, 02:56 AM
djl47 Offline
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.jpg - DCT (Discrete Cosine Transform)

Here's a great video from Computerphile (A sibling channel to Numberphile) that explains how DCT (Discrete Cosine Transform) is used to remove high frequency information from an image making it more compressible.

https://www.youtube.com/watch?v=Q2aEzeMDHMA
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Old 26th May 2015, 03:34 AM
lsatenstein Online
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Re: .jpg - DCT (Discrete Cosine Transform)

excellent explanation, Thanks for the link
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Old 26th May 2015, 06:47 AM
djl47 Offline
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Re: .jpg - DCT (Discrete Cosine Transform)

In the first video the narrator makes references to RGB (Red Green Blue) YCbCr (Which is a way to encode RGB info http://en.wikipedia.org/wiki/YCbCr) and YMC (Yellow Magenta Cyan) This video helps explain colourspaces
https://www.youtube.com/watch?v=LFXN9PiOGtY
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