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--- square-division_versus_two-sample_interleave [2017/10/02 21:34] – external edit 127.0.0.1
+++ square-division_versus_two-sample_interleave [2023/03/21 20:39] (current) – walkeradmin
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-==== Quad ====
+==== Quad (Square Division) ====
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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).
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-Quadrant order is still an issue though, in fact more so than the square division quad 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.
+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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+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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+{{:square_division_quad.jpg?900|}}
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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, but as a fully decodable HD image.
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+{{:2si.jpg?900|}}
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+SI method allows picture
+monitoring on standard 1080P displays as each link carries the whole image at ¼ of its original resolution