Hidden surface removal using z-buffer for computer-generated hologram

Yuji Sakamoto; Masafumi Takase; Yoshinao Aoki

doi:10.1117/12.473824

4 June 2003 Hidden surface removal using z-buffer for computer-generated hologram

Yuji Sakamoto, Masafumi Takase, Yoshinao Aoki

Proceedings Volume 5005, Practical Holography XVII and Holographic Materials IX; (2003) https://doi.org/10.1117/12.473824
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

Hidden surface removal (HSR) method is a key technique to display realistic 3D images. We propose a new HSR algorithm for CGH in order to be adapted to multi-view. Object-light on a hologram is decomposed into rays arrived from all points of objects. In the assumption of geometrical optics, both a position and a directional angle determine each ray on a hologram. We propose z-buffer for CGH with the two coordinates of position and angle, which represent rays arrived at a hologram. The path length of all rays are calculated and stored in the elements of the z-buffer. In the area of hidden surface, where there are more than one ray at the same element, the shortest ray is stored. By the process, we get a list of rays arrived at the hologram, and the summation of the listed rays represents the object-light. Using the holograms calculated by the method, optical experiments were carried out. They showed us reconstructed 3D images with opaque surfaces. Because a number of objects dose not dominate the calculation time, the method requires shorter time compared with conventional method in case of a large number of objects.

Citation Download Citation

Yuji Sakamoto, Masafumi Takase, and Yoshinao Aoki "Hidden surface removal using z-buffer for computer-generated hologram", Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, (4 June 2003); https://doi.org/10.1117/12.473824

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