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This is called drizzle (with dithering, e.g. the raw photos are taken with offsets) in the astrophotography sphere and is very effective when the images are und
by gliptic 5y ago
This is called drizzle (with dithering, e.g. the raw photos are taken with offsets) in the astrophotography sphere and is very effective when the images are undersampled. Although, astronomy images have the advantage of being filled with stars that are relatively easy to align very accurately.
- vanderZwan 5y agoI imagine the minuscule vibrations of a shutter make it a natural fit to the already existing image stacking pipeline, correct?
- gliptic 5y agoI'm not sure what you mean. Mechanical shutters have no upsides I'm aware of :). Astro cameras use electronic shutters. EDIT: The dithering, or offsetting, is done by moving the telescope slightly between exposures. During exposures you want it to track the object you're photographing as accurately as possible. I imagine vibrations are a detriment even in the Pixel phone processing. It would be better if the phone could move instantly in slightly different directions and take steady raw photos in each.
- vanderZwan 5y agoAh, I was thinking of amateur astrophotography - although these days you can just set the mechanical shutter in many consumer DSLRs to stay open too I think.
- galangalalgol 5y agoI think maybe you were considering the vibrations a source of noise for compressed sensing? For CS to work well you generally want to know the convolved noise. So a super accurate accelerometer might be able to measure random vibrations and do even better when they are present than absent. Not sure if phone accelerometers are that good.
- xhkkffbf 5y agoYes, I believe Google's team publicly says it helps add just enough random translation.
- IAmEveryone 5y agoDo camera phones have mechanical shutters? I'm almost certain they don't.
- dr_zoidberg 5y agoOn camera phones the random movements come from the users own instability when taking pictures.
- nullc 5y ago'When undersampled' -- time to get a more modern sensor? 3.76um pixels + 800mm focal length is about 1 arcsecond per pixel, so that will end up seeing limited much of the time.
- gliptic 5y agoMany undersample on purpose and get better results that way. You can workaround seeing a little with lucky imaging and patience, being very selective. Also, drizzling was developed originally for the Hubble Deep Field, which isn't limited by seeing :).