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DCIF

DCIF

The standard 2CIF (704 * 288, also known as Half D1) resolution has doubled the level of CIF (352 * 288) in horizontal direction, while remains the same in vertical direction. The display ratio, which we are used to, is 4: 3, however. Thus the zooming of images in both horizontal and vertical directions will lead to visual imbalance.
If we use an odd HALF D1 and an even HALF D1 to form a D1 format after anti-interlaced transformation, with a 3/4 reduction in horizontal and a 2/3 reduction in vertical, the D1 format will be transformed to 528*384, whose pixel number is precisely twice of CIF format (352*288). In order to be different from the commonly-called 2CIF, we call it DOUBLE CIF or DCIF for short. Obviously, in both horizontal and vertical directions, DCIF is more balanced than Half D1, and it has better resolution in both directions than CIF.

After testing a large number of video signals, DCIF (528*384) can solve the not clear problem of CIF and large stream data problem of D1 based on the current video compression algorithm, and acquire stable, high-quality image with bit rate between 512K-1M.

:2010-1-28 22:44:47
 
 
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