Fast calculation with point-based method to make CGHs of the polygon model

Yuki Ogihara; Tsubasa Ichikawa; Yuji Sakamoto

doi:10.1117/12.2039821

25 February 2014 Fast calculation with point-based method to make CGHs of the polygon model

Yuki Ogihara, Tsubasa Ichikawa, Yuji Sakamoto

Proceedings Volume 9006, Practical Holography XXVIII: Materials and Applications; 90060T (2014) https://doi.org/10.1117/12.2039821
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

Holography is one of the three-dimensional technology. Light waves from an object are recorded and reconstructed by using a hologram. Computer generated holograms (CGHs), which are made by simulating light propagation using a computer, are able to represent virtual object. However, an enormous amount of computation time is required to make CGHs. There are two primary methods of calculating CGHs: the polygon-based method and the point-based method. In the polygon-based method with Fourier transforms, CGHs are calculated using a fast Fourier transform (FFT). The calculation of complex objects composed of multiple polygons requires as many FFTs, so unfortunately the calculation time become enormous. In contrast, in the point-based method, it is easy to express complex objects, an enormous calculation time is still required. Graphics processing units (GPUs) have been used to speed up the calculations of point-based method. Because a GPU is specialized for parallel computation and CGH calculation can be calculated independently for each pixel. However, expressing a planar object by the point-based method requires a signi cant increase in the density of points and consequently in the number of point light sources. In this paper, we propose a fast calculation algorithm to express planar objects by the point-based method with a GPU. The proposed method accelerate calculation by obtaining the distance between a pixel and the point light source from the adjacent point light source by a difference method. Under certain speci ed conditions, the difference between adjacent object points becomes constant, so the distance is obtained by only an additions. Experimental results showed that the proposed method is more effective than the polygon-based method with FFT when the number of polygons composing an objects are high.

Citation Download Citation

Yuki Ogihara, Tsubasa Ichikawa, and Yuji Sakamoto "Fast calculation with point-based method to make CGHs of the polygon model", Proc. SPIE 9006, Practical Holography XXVIII: Materials and Applications, 90060T (25 February 2014); https://doi.org/10.1117/12.2039821

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available