What Does Macroblock Mean?

A macroblock is a processing unit in visuals and
video compression, and is based on linear block revamping. This is
then subdivided into transform blocks and it is further subdivided into
prediction blocks.
A macroblock is usually a block of adjacent pixels,
typically 16×16.


Techopedia Explains Macroblock

frames in a picture are called I-frames. These are divided into 8×8
blocks that are not overlapping by nature. These are called pixels.
These pixels are then further rearranged into 16×16 blocks called
macroblocks. Any macroblock consists of a 16×16 array of luma. These
elements consist of 16×16 luma samples, and 8×8 chroma samples. Luma samples denote the brightness or the
achromatic portions, while the chroma samples denote the chromatic or the
colored portions. Thus, macroblocks can be thought of as 16×16 pixel
areas. The JPEG image format is based on macroblocks.


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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.