An analysis of the influence of the color rendition of images reconstructed from full-color computer-generated Fourier-transform holograms

Abstract

The color rendition of an image reconstructed from a color computer-generated Fourier hologram (CCGFH) is both a basic and an important issue in the field of holography. In this study, CCGFHs are encoded with the Burch encoding algorithm and then loaded onto a spatial light modulator for optical reconstruction. The influence of the color rendition of the reconstructed images has been analyzed primarily through experiments. The experimental results show that the individual element size used in encoding the CCGFH is inversely proportional to both the size and the central location of the reconstructed images, whereas the wavelength of the monochromatic light used in optical reconstruction is proportional. Some parameters related to the spectrum, such as different transmittances, half-widths of the three primary color filters and different sensitivity levels to the three primary colors of the complementary metal–oxide–semiconductor (CMOS), affect the color rendition of the reconstructed image. A method for correcting color aberration in reconstructed images is proposed. Using this method, the influence of the wavelength can be corrected by stretching the reconstructed image to an appropriate size and the influence of the spectrum can be corrected by equalizing the spectral sensitivity levels of the CMOS. The color rendition of the reconstruction is improved significantly using the method. The proof-of-principle experiments demonstrate that the method is effective and feasible.