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common intermediate format (file format, H.323) (CIF)

Common Intermediate Format(CIF), also known as Full Common Intermediate Format (FCIF), is a display format defined in the H.323 standard for video codecs with a resolution of 352 x 288 pixels (Europe) and 352 x 240 pixels (USA) and a frame rate of 30 full frames. The number of pixels is 101,376 (Europe) and 84,480 (USA).

The defined resolution corresponds to half the resolution of a standard video signal. Since in the PAL television standard only 575 of the 625 lines are visible, and moreover one frame consists of two fields, the visible number of lines of one field (288) has been specified as the resolution for the CIF display format, which is also called Full Common Intermediate Format (FCIF). The same applies to the horizontal resolution.

CCIR standards for digital video

CCIR standards for digital video

The Common Intermediate Format comes in several lower and higher resolution variants: SQCIF (128 x 96), QCIF (176 x 144), 4CIF (704 x 576), 9CIF (1,056 x 864) and 16CIF (1,408 x 1,152). In addition, there are two variants for high-definition television ( HDTV), HD-CIF(High Definition CIF). The high-definition format has a resolution of 1,920 x 1,080 pixels, while the second variant has a resolution of 1,280 x 720 pixels.

Image resolutions in video technology

Image resolutions in video technology

The CIF standard is designed in such a way that no quality-reducing interpolation of the pixels takes place during norm conversions. This means that each frame is identical in its standard and does not have to be changed.

Informations:
Englisch: common intermediate format (file format, H.323) - CIF
Updated at: 15.04.2014
#Words: 221
Links: cells in frames (ATM) (CIF), also known as (aka), display, standard (STD), video
Translations: DE
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