square-division_versus_two-sample_interleave
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square-division_versus_two-sample_interleave [2016/11/22 08:43] – [Two Sample Interleave (2SI)] walkeradmin | square-division_versus_two-sample_interleave [2023/03/21 20:39] (current) – walkeradmin | ||
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- | ====== Square-division versus two-sample interleave ====== | + | ====== Square-division versus two-sample interleave |
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- | Or in AVP terminology, | + | |
- | \\ | + | ==== Quad (Square Division) |
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- | ==== Quad ==== | + | |
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Quad (Square Division) is the way we started our AVP H.264 contribution. The 4K signal is presented as 4xHD-SDI (up to p30) or 4x3G-SDI (up to p60). Each input is a quarter of the image (quadrant). | Quad (Square Division) is the way we started our AVP H.264 contribution. The 4K signal is presented as 4xHD-SDI (up to p30) or 4x3G-SDI (up to p60). Each input is a quarter of the image (quadrant). | ||
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- | Quadrant order is still an issue though, in fact more so than the square division | + | Quadrant order is still an issue though, in fact more so than the square division format. In square division, if your quadrants are out of order, it's really obvious (except on extremely random patterns) it's like a mis-assembled jigsaw. However on 2SI, if you invert say quadrant 1 and 2, the result is quite subtle, and on still or slow moving material, it's not obvious at all. So great care still has to be take to ensure the quadrant order is correct. |
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+ | The SDI specification now allows for the signalling of the SDI number in the SDI stream. On the AVP, if this SDI numbering is present, you can plug the SDI inputs in using any order, and the AVP HEVC card will work it out (in 2SI mode). | ||
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+ | In Square Division QUAD mode, the picture is split in to four quadrants, each quadrant containg a quarter of the image. | ||
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+ | Each quadrant comprises exactly 1/4 of the UHD Image (so a 1920x1080 HD image) | ||
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+ | For 2SI mode, each quadrant contains a quarter of the picture information, | ||
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+ | 2SI method allows picture | ||
+ | monitoring on standard 1080P displays as each link carries the whole image at ¼ of its original resolution |
square-division_versus_two-sample_interleave.1479804230.txt.gz · Last modified: 2023/03/09 22:35 (external edit)