Depth extraction and recovery from the recorded image have been studied and applied in many fields such as biology, robotics, and computer vision. In some researches, the aperture in the imaging system is coded as a particular function in order to distinguish relative distances from the focal plane or recognize sampled points from the recorded image and the image captured through this coded aperture is useful to retrieve blurred images or acquire depth maps. These studies are associated with the shape of point spread function (PSF). In some approaches, diffraction-based engineered PSFs such as double-helix and cubic phase are applied to extract the depth information. In this paper, we propose a depth measurement method based on the optical analysis of the pupil function. It is well known that the PSF is represented as a Fourier transform of the product of pupil function and spherical phase in a coherent imaging system. Also, it is possible to estimate the intensity of the PSF corresponding to the distance of the object in an incoherent imaging system. Then the depth information is extracted from a snapshot image by inverse transform of the image.
Recently, three-dimensional (3D) display technologies actively have been researched for improving the quality of 3D display and for reducing 3D sickness such as the vergence-accommodation conflict. One of approaches is super multiview (SMV) display in which more than two views enter the pupil of the eye. We invented a time-sequential SMV theater system which is able to change the number of views entering the pupil. The SMV display consists of the projection part and the observation part. The projection part contains a light engine to realize full-color images by using three digital micro-mirror devices (DMDs). The image projected at the screen is observed through the observation part. The optical system functions as defining the direction of the optical rays acquired by the eyes according to the position of the opening. We implement this opening by using a DMD and the movement of the opening is realized by changing the slit patterns on the DMD. Two DMDs are synchronized to each other and the projection image is selectively observed by the predetermined position of the opening sequentially. In our system, the observation part is designed the observer to wear the device and this system is expected to have a potential to provide SMV to the audience in the theater.
Three-dimensional (3D) displays have various shapes such as plate, pyramid, cylinder, sphere and etc. Every shape has its characters. One of them, the spherical shape is totally symmetric around the center. We design our system in order to display the image inside of the crystal ball. Even though the spherical crystal ball has perfect symmetry, there are some significant difficulties in designing optics since the crystal ball has severe spherical aberration. To display 3D contents, we generate many views by digital micromirror device in high speed and change the propagation direction of each view by 2-axis scanning mirrors and relay lenses. Theses plural images correspond to views of 3D object inside of the crystal ball.
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