As a plus, this might finally be something we can use the upcoming eight- and sixteen-core computers for. :)
Not very sharp, and the depth of field appears to not be all that great. Yeah, you can put anything you want in focus, but not so much with making something 2 inches behind that out of focus.
There are more efficient ways to estimate the integral for the relatively simple case of refocusing, and optimizations are presented in the next chapter. However, the ray-tracing concept is very general and subsumes any camera configuration. For example, it handles the case of the generalized light field camera model where the microlenses defocus, as discussed in Section 3.5 and Chapter 5, as well as the case where the main lens exhibits significant optical aberrations, as discussed in Chapter 7.
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