How did one former Stanford student explain the theory of light field photography in 2006?

VIDEO 2 min. 25 sec. This video, uploaded in 2006 before the 2012 introduction of the Lytro light field camera, explains the theory behind the light field photography using a hand-held plenoptic camera, as researched by Stanford Computational Imaging Group. There is a short demo and the audio and diagramming starts at 41 seconds.

https://www.youtube.com/watch?v=9H7yx31yslM

Visit the next page to see a Scientific American “Instant Egghead” video with a different illustration of the light field camera, using the Lytro camera as an example.