http://halicery.com/1IDCT/DCT matrices.html

DCT matrices

Without going into deep academic

Some investigations on how to understand the DCT- and inverse DCT, as it is used in different image- and video Decoder Standards. During some work on writing decoders in C for JPEG, MPEG, HEVC (AVC defines its own transform, there is nothing else to do there), I had to wrap my head around this many times and write code for computing the transform efficiently. Here we look at different order-2n DCT matrices with some spreadsheet help.

I've written some more text about this, get the PDF for full text and the Excel sheet for the calculations.


Sat May 5 14:24:06 UTC+0200 2018 © A. Tarpai