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June 30th, 2009, 07:52 PM | #16 | |
Panasonic Broadcast
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Quote:
Best, jan
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Jan Crittenden Livingston Panasonic Solutions Company, Product Manager for 3D and Handheld Cameras |
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July 1st, 2009, 01:54 PM | #17 |
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But... they are both being read off of the imagers (CMOS chips) at exactly the same full raster size.. 1920x1080. 720 24p mode is simply down rezzing after the fact.. after it has been processed from the imager.. If it was a case of smaller versus larger, then there would be a crop factor negative size value offset. Both 720 24p and 1080 24p clock the same... 24 fps..
I did watch the video.. and yes.. it is very helpful :) |
July 1st, 2009, 06:00 PM | #18 | |
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Quote:
Don't know that that helps, but.... Jan
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Jan Crittenden Livingston Panasonic Solutions Company, Product Manager for 3D and Handheld Cameras |
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July 11th, 2009, 03:34 PM | #19 | |
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If we imagine the camera panned across a vertical line, lets assume the panning speed is such that in the 1080 frame, the bottom of the line is offset 60 pixels with respect to the top of frame. The skew then becomes 60/1920=1/32 of the frame width from top to bottom. Do a downconvert to 720p, and those 60 pixels must scale down to 40 pixels (60x 1280/1920), so yes indeed, smaller, therefore less. BUT those 40 pixels still represent 1/32 (40/1280) of the frame width - and consequently exactly the same skew!! |
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