Accurate calculation of computer-generated holograms using angular-spectrum layer-oriented method

Abstract

Fast calculation and correct depth cue are crucial issues in the calculation of computer-generated hologram (CGH) for high quality three-dimensional (3-D) display. An angular-spectrum based algorithm for layer-oriented CGH is proposed. Angular spectra from each layer are synthesized as a layer-corresponded sub-hologram based on the fast Fourier transform without paraxial approximation. The proposed method can avoid the huge computational cost of the point-oriented method and yield accurate predictions of the whole diffracted field compared with other layer-oriented methods. CGHs of versatile formats of 3-D digital scenes, including computed tomography and 3-D digital models, are demonstrated with precise depth performance and advanced image quality.

P‐90: Image Enhancement of 3D Holographic Head‐Up Display Using Multi‐Constraints Angular Spectrum Algorithm

“…The multiplane 3D images reconstruction is realized by the field superposition [8]. First, the 3D image is sliced into multiple layers with different distances which provide the 3D information to reconstruct the desired patterns.…”

Holographic display technology based on liquid crystal device

“…Moreover, a method to suppress speckle noise in 3D holographic display has been proposed by utilizing a reflective phase‐only SLM based on off‐axis double‐phase complex modulation . As shown in Figure , a blazing grating is proposed to separate the complex amplitude on the frequency plane, and a 4 f system with a filter is used at the frequency plane to suppress noises and higher order diffractions . The results are recorded by the camera at four different plans with high image quality.…”

Recent progress in computer-generated holography for three-dimensional scenes

“…The corresponding optical field in the hologram plane is obtained by propagating U(ξ , η; z = z i ) to the z = 0 plane numerically using the method explained in Section 2. This process is repeated for all the layers, and the optical field in the hologram is accumulated, resulting in the final hologram [20]. The layer-based method is simple and is usually computationally efficient as the number of layers is smaller than that of the other primitives, such as the point, triangle, and light ray.…”