To project the image, the process is reversed. Half the laser light is reflected off the interference pattern, and then recombined with the a beam that has not been modified. The combined beam is then projected towards the viewer using a lens system. Viewers perceive the 3D object rather than the interference pattern.

So, computing a hologram sounds pretty simple: just recreate the interference pattern. But there is a gotcha. For instance, if you cut a photograph in two, you get two partial images. Cutting a hologram in two, however,  results in two complete images of lesser quality—every pixel encodes information about the entire image. And therein lies the rub: to display a computed hologram, the intensity of each pixel must be calculated from the entire interference pattern, not just the local contribution to the object.

Read More at;

Ars Technica: Holographic GPU renders at near real-time speeds

Comments are closed.