Shading of holographic reconstructed image by two-dimensional amplitude modulation of zone plates

Takayuki Kurihara; Yasuhiro Takaki

doi:10.1117/12.907621

9 February 2012 Shading of holographic reconstructed image by two-dimensional amplitude modulation of zone plates

Takayuki Kurihara, Yasuhiro Takaki

Proceedings Volume 8281, Practical Holography XXVI: Materials and Applications; 82810H (2012) https://doi.org/10.1117/12.907621
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We propose a technique to shade reconstructed images of electronic holography. Our technique modifies the zone plate technique, which represents a three-dimensional object as an aggregate of object points and zone plates, which generate object points, are summed to calculate a hologram. Our technique is based on the Phong reflection model developed for computer graphics, which assumes that light reflected from an object consists of three components: diffuse, specular, and ambient reflection light. Among these components, only the specular component depends on the position of the camera (or the eye). A holographic reconstructed image changes depending on the viewing direction. Therefore, the specular component changes for different viewing directions. Because light modulated by a zone plate converges to an object point, we assumed that light is redirected differently at each point on the zone plate. Therefore, two-dimensional amplitude modulation of the zone plate would generate an object point that emits light with different intensities in different directions. The proposed two-dimensional amplitude modulation comprises variable and constant modulations: the former one controls the specular component and the latter one controls the diffuse and ambient components. We experimentally verified the proposed technique.

Citation Download Citation

Takayuki Kurihara and Yasuhiro Takaki "Shading of holographic reconstructed image by two-dimensional amplitude modulation of zone plates", Proc. SPIE 8281, Practical Holography XXVI: Materials and Applications, 82810H (9 February 2012); https://doi.org/10.1117/12.907621

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