1 March 2013 Measurement method for objective evaluation of reconstructed image quality in CGH
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A computer generated hologram (CGH) is a hologram generated by simulating the recording process of a hologram on a computer. Various methods have been proposed for generating a hologram using CGH. However, an objective evaluation method for comparing images reconstructed by different CGH methods has not yet been established. So far, only subjective evaluation has been used to evaluate the images. The objective evaluation is necessary to standardize conditions for age of subject, vision, etc. Volume signal to noise ratio (VSNR) has been proposed for objective evaluation. VSNR is a three-dimensionally extended signal to noise ratio (SNR), that represents the difference between the spatial light distribution of reconstructed images and a real object. Although VSNR seems suitable for quality measurements in the 3D domain, measurements and comparisons of VSNR have been limited to computer simulation. In this paper, we propose a method of measuring spatial light distribution using a digital camera and measures the VSNR. Spatial light distributions are generated by taking pictures of the reconstructed images and real objects at various focal lengths. The VSNRs of various CGH calculation methods and multi-view 3D display technologies are then measured by the distributions. We compared VSNRs from different CGH methods and found that speckle noise deteriorated the VSNRs of the reconstructed images of holograms.
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Kazuhiro Suzuki, Kazuhiro Suzuki, Yuji Sakamoto, Yuji Sakamoto, "Measurement method for objective evaluation of reconstructed image quality in CGH", Proc. SPIE 8644, Practical Holography XXVII: Materials and Applications, 864412 (1 March 2013); doi: 10.1117/12.2003530; https://doi.org/10.1117/12.2003530

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