Practical method for color computer-generated rainbow holograms of real-existing objects

Abstract

A novel method for computer-generated rainbow holograms (CGRHs) of full-color objects is proposed. First, a new algorithm for fabricating full-color CGRHs of real-existing objects is proposed based on the interrelationship between coding of a CGRH and reconstruction of the hologram. Second, a color rainbow hologram for a real-existing object is generated by combining the proposed algorithm and computer-generated hologram generating system. Finally, the hologram is outputted by an auto-microfilming system. The principle of the algorithm, the process of hologram calculation, and the hologram generating system for real-existing objects and experimental results are presented. The experimental results demonstrate that the new method is feasible.

Practical Color Matching Approach for Color Computer-Generated Holography

“…Secondly, the color quantity can be converted to by (12), then the amplitude of object light field are obtained by employing (11). Thirdly, the CGCRH algorithm is used to encode the color object light whose amplitude are [5]. The width of slit, viewing distance and reference incidence angle are respectively 3 mm, 350 mm and 11.2 .…”

“…The width of slit, viewing distance and reference incidence angle are respectively 3 mm, 350 mm and 11.2 . Finally, the digital rainbow hologram is direct written on holographic recording material by a self-made CGH auto-microfilming system [5], [15]. The color rainbow hologram that can be reconstructed by white light is obtained after processing the exposed hologram plate.…”

“…It is well known that color information in CCGH is always comes from a digital color image, which can be acquired 1551-319X © 2013 IEEE from virtual 3D modeling or real-existing object capturing [5], [13]. The color transfer process is determined by the RGB colorimetric system of computer monitor, such as PAL-RGB and NTSC-RGB systems.…”

“…By using this method, there exists great color difference between holographic image and digital color image, which may be still acceptable in some cases because of the color constancy of human eyes. Obviously, it is not the correct color matching method for CCGH, which has prevented practical application of CCGH especially in some occasions that requires high color reproduction quality such as color information preservation of cultural assets and valuable artware by holography, holographic display of portrait, real-existing objects and so on [5], [12], [13]. Thus, an appropriate color matching method is indispensable for improving the color reproduction quality of holographic image of CCGH.…”

High-Resolution Hologram Calculation Method Based on Light Field Image Rendering

“…High-resolution holograms such as rainbow holograms and Fresnel holograms are applicable for 3D advertising and packaging because of the emerging of holographic printing technology [9][10][11][12][13][14]. The biggest challenge for high-resolution holography is the huge amount of computation.…”