on 2013-08-13 21:28 Godfrey DiGiorgi wrote
They're not "stitching a video" with the iPhone Panorama feature, the number of
vertical pixels is wrong for that.
right, that's why Larry was thinking in terms of using "full-res" video, a
full-resolution camera image (8mp for iPhone 5) for each frame of video, to
auto-stitch panoramas; that's a brute-force concept, and not what the iPhone
does; i guessed that the iPhone "watches" its video feed to detect when to take
a full res shot for the next segment of the panorama, but it turns out it's a
more subtle process; interpreting from these two sources:
<http://www.anandtech.com/show/6330/the-iphone-5-review/16>
<http://www.patentlyapple.com/patently-apple/2012/11/apples-cool-iphone-5-panorama-app-revealed-in-5-patents.html>
the phone uses it's gyroscope to know where it's pointed relative to the
initial frame, and then at the appropriate moments takes data from just a
central strip of the sensor, while also producing a continuous live view image
(the iPhone 5 also introduced the capacity to take full-res still shots while
also capturing video)
while the iPhone 5 sensor is 3264x2448 pixels, various reports put the actual
height (assuming "normal" orientation) of a finished panorama in the mid-to-low
2000s, so it seems to discard some info from the top & bottom of the sensor to
allow for imperfect aim
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