We propose a digital hologram generation method from diffracted intensity images based on the transport of intensity
equation. In this paper we do experiment to verify the proposed method with coherent illumination with simple
experiment setup using the intensity images capture process. The experiment results show that our proposed method has
advantages compared to both the conventional holography with interferometry and the hologram generation based on
multiple intensity images.
A novel method to capture a Fourier holography of the three-dimensional objects under regular incoherent illumination is
proposed. Multiple images of the three-dimensional objects are captured by a camera while moving the focal plane along
the optic axis over the whole object space. Captured multiple defocused images are processed considering the point
spread function of the camera and the Fourier holography is finally synthesized. The principle is explained and verified
The resolution of the reconstructed object from the Fourier hologram that is generated from multiple view images is
analyzed in this paper. We found that the maximum view angle and the wavelength limit the maximum frequency of the
reconstructed object. The relationship between the bandwidth of the object and the lens pitch of the lens array affects the
aliasing of the reconstruction. All these four parameters determine the resolution of the reconstruction from the Fourier
hologram. Based on these analyses, we propose a lens array shift method to enhance the resolution of the reconstructed
object from the Fourier hologram. By shifting the lens array, multiple sets of element images are obtained, and high
spatial density element image is combined from the multiple sets of element images. The resolution enhanced
reconstruction of the object can be obtained from the Fourier hologram of the combined element images. The principles
are verified by experiment.
We propose a method for generating holograms of real existing 3D objects without coherent optical system. Multiple
orthographic view images of the 3D objects are captured under incoherent illumination and Fourier or Fresnel hologram
is synthesized using captured view images. A lens array is used to capture multiple orthographic view images efficiently.
We also present a method enhancing the phase-only Fourier hologram. By applying the constraints to the orthographic
view images and the generated hologram iteratively, the enhanced phase hologram is obtained.