For JPEG and MPEG pictures are divided into 16 x 16 pixel macroblocks each comprising four 8 x 8 pixel blocks. For MPEG-1 used for Video CD, there are up to 396 macroblocks per frame or picture.
Both the H.261 and the MPEG-1 specifications define a unit within an image called a macroblock. This unit is a 16-by-16 block of pixels. Both H.261 and MPEG-1 encoders can switch from intraframe encoding to interframe encoding on a macroblock basis.
In a video compression scheme, a group of spacially adjacent pixels, usually forming a rectangular block, processed more or less together and somewhat separately from other pixels.
In MPEG MP@ML, the four 8 x 8 blocks of luma information and two 8 x 8 blocks of chroma information form a 16 x 16 area of a video frame.
(n.) In MPEG terminology, a 16-by-16 block of samples from a video frame. This is the unit of data associated with motion information.
In MPEG MP@ML, the four 8x8 blocks of luma information and two 8x8 blocks of chroma information form a 16x16 area of a video frame.
A block of 16 x 16 pixels. Used in MPEG for motion compensation prediction.
See block. Macroblocks are a 16 × 16 array of luma pixels (4 blocks) and a variable number of chroma pixels. It is the basic unit for motion compensation, and can either be field coded or frame coded depending on how the luma pixels are extracted from it. A series of macroblocks is called a slice.