Common Intermediate Format

From Academic Kids

CIF (Common Intermediate Format) is used to standardize the horizontal and vertical resolutions in pixels of YUV sequences in video signals. QCIF means "Quarter CIF". These two formats are common in video encoding. To have fourth the area as "quarter" implies, height and width of the frame are halved. A CIF is commonly defined as one-quarter of the 'full' resolution of the video system it is intended for (listed below as 4CIF). Note that this full resolution does not match what is currently refered to as D1 video (based upon Sony's D1 format).

Video resolutions (in pixels)
Format NTSC-based PAL-based
SQCIF 128 96
QCIF 176 120 176 144
CIF 352 240 352 288
4CIF 704 480 704 576
9CIF 1056 720 1056 864
16CIF 1408 960 1408 1152
D1 720 486 720 576
SIF 352 240 352 288
SIF* 360 240 360 288
* = Rounded to the nearest multiple of 16.

See also: DVD, VCD, HDTV, DVB

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