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Can anyone point to a very simple guide on how lightfield cameras work per chance, I've heard of the lytro camera which I believe used an array of lenses above
by anfractuosity 5y ago
Can anyone point to a very simple guide on how lightfield cameras work per chance, I've heard of the lytro camera which I believe used an array of lenses above the sensor?
Where all those lenses the same though?
With the Lytro camera I believe that could 'refocus' an image, but didn't think it could obtain 3D information? If that's the case, could anyone guess how 3D information is obtained from this camera.
- andybak 5y agoFrom my brief reading of their website, I'm not sure I would call this a lightfield lens. It's just 9 images from 9 slightly different offsets along with some clever post-processing. (Although maybe the difference is one of degree rather than kind - the Lytro is "micro-lens array" so maybe the question becomes "how many images do you need to be a light field image?)
- Dayanto 5y agoMy go to for light field cameras would probably be this video: https://www.youtube.com/watch?v=rEMP3XEgnws https://www.youtube.com/watch?v=rEMP3XEgnws It explains the specifics of how light field cameras work quite well, but doesn't go too deep into light fields. For more of an overview of light fields in general, I can recommend this video: https://www.youtube.com/watch?v=BXdKVisWAco https://www.youtube.com/watch?v=BXdKVisWAco My answer to your question would be that light field cameras sample discrete perspectives from a 4D light field. These samples can either be 1) combined directly (requires a very high view density) 2) interpolated to try to recover the continuous 4D light field function (this is an active area of research), 3) downsampled to volumetric 3D (Google's approach with "Welcome to light field" etc.), or 4) downsampled to 2D + depth (a depth map) Each of these use different methods.