2023 年 11 巻 2 号 p. 38-43
Image quality of the computer-generated holograms are usually evaluated subjectively. For example, the reconstructed image from the hologram is compared with other holograms or the original image. In previous research, authors proposed image quality evaluation by peak signal-to-noise ratio and diffraction efficiency. In the present research, the structural similarity index (SSIM) is evaluated which is considered to have good agreement to perceptual image quality. Theory and numerical experimental results are shown on Fourier transform transmission hologram of both amplitude and phase modulation. From numerical simulations, bipolar intensity method, or real number calculation gives better quality than that of classical complex number calculation. Phase hologram is much brighter than amplitude hologram, however SSIM becomes lower except Kinoform that has optimized phase in the image plane.
