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Lecture 16: Light Field Cameras (23)

So if each pixel can be represented by a disk image, does the space between each disc represent anything?


It is quite interesting to see that the disk images are designed as hexagons rather than the more commonly seen squares.


What do you mean by hexagons? I thought that since it's a disk image, it would be circular?


I didn't quite understand what was said in lecture about why the disks images are circular. Does each disk represent a pixel? Where the circle represents the light coming from each part of the lens aperture? And the difference between this and a regular photograph would be that we can now see the light from different parts of the aperture at each point rather than just the result of aggregating all the light together.


You can think of each disk as a big pixel, and each little pixel in the disk is the radiance of an incoming light ray in some particular direction. Each big pixel is circular since this would give a uniform sampling of directions.


I think each disk image would be circular, which represents the dimension u and v in the 4D light field image. One disk image represents radiance of rays origin at that pixel pointing towards different directions. So if something is in focus (e.g. the face), then all those rays origin at that pixel would converge at that point on the man's face, and result in a uniform color.

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