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Computer generated holography using a graphics processing unit

Nobuyuki Masuda, Tomoyoshi Ito, Takashi Tanaka, Atsushi Shiraki, and Takashige Sugie

Open Access Open Access

Abstract

We have applied the graphics processing unit (GPU) to computer generated holograms (CGH) to overcome the high computational cost of CGH and have compared the speed of a GPU implementation to a standard CPU implementation. The calculation speed of a GPU (GeForce 6600, nVIDIA) was found to be about 47 times faster than that of a personal computer with a Pentium 4 processor. Our system can realize real-time reconstruction of a 64-point 3-D object at video rate using a liquid-crystal display of resolution 800×600.

©2006 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Block diagram of GPU: “VS” is a vertex shader and “PS” is a pixel shader.

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Fig. 2.
Fig. 2. CGH images: (a) 800 × 600-grid image by GPU, (b) 800 × 600-grid image by CPU.

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Fig. 3.
Fig. 3. Reconstructed images: (a) GPU, (b) CPU.

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Fig. 4.
Fig. 4. Movie of a reconstructed image [Media 1]

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Tables (2)

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Table 1. The spec sheet of nVIDIA’s GeForce 6600

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Table 2. Comparison between the calculation time of GPU (GeForce 6600) and Pentium 4 3.2-GHz.

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Equations (4)

Equations on this page are rendered with MathJax. Learn more.

I ( x α , y α ) = ∑ j = 0 N − 1 A j cos ( 2 πθ ) ,
θ = 1 λ ( x α − x j ) 2 + ( y α − y j ) 2 + z j 2 ,
θ = z j λ + 1 2 λ z j { ( x α − x j ) 2 + ( y α − y j ) 2 } ,
θ = 1 2 λ z j { ( x α − x j ) 2 + ( y α − y j ) 2 } .
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