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What is CIF, QCIF, 4CIF and D1 Resolution?

CIF D1 QCIF resolution
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What is CIF, QCIF, 4CIF and D1 Resolution?

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CIF (Common International Format), also known as FCIF (Full Common Intermediate Format), is a format used to standardize the horizontal and vertical resolutions in pixels of YCbCr sequences in video signals, commonly used in video teleconferencing systems. It was first proposed in the H.261 standard. CIF was designed to be easy to convert to PAL or NTSC standards. CIF defines a video sequence with a resolution of 352 × 288 for PAL. QCIF means “Quarter CIF”. To have one fourth of the area as “quarter” implies the height and width of the frame are halved 4CIF or D1 (both are same) refers to 704 X 576 pixels for PAL standard.

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