O'Reilly logo

Digital Video and HD, 2nd Edition by Charles Poynton

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

21

Resampling, interpolation, and decimation

In video and audio signal processing, it is often necessary to take a set of sample values and produce another set that approximates the samples that would have resulted had the original sampling occurred at different instants – at a different rate, or at a different phase. This is called resampling. (In PC parlance, resampling for the purpose of picture resizing is called scaling.) Resampling is an essential part of video processes such as these:

• Chroma subsampling (e.g., 4:4:4 to 4:2:2)

• Downconversion (e.g., HD to SD) and upconversion (e.g., SD to HD)

• Aspect ratio conversion (e.g., 4:3 to 16:9)

• Conversion among different sample rates of digital video standards (e.g., 4f SC to 4:2:2, 13.5 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required