Biomedical subjects

Ju-Seog Jang

Publications and source records attributed to Ju-Seog Jang.

6 recordsLinked to original sources

PubMed2004

Effects of device resolution on three-dimensional integral imaging.

We present the effects of a finite number of pixels in elemental images on the resolution and the depth of focus in three-dimensional integral imaging (II). We show that the number of pixels in elemental images determines not only the lateral resolution but also the depth resolution. The minimum number of pixels required in each elemental image is calculated to avoid depth-of-focus degradation. We evaluate how II system performance degrades as the number of pixels in each elemental image changes. The product of the depth of focus and the lateral resolution squared is used as the performance metric.

Journal Article↗

PubMed2004

Three-dimensional integral imaging of micro-objects.

We propose a method for displaying micro-objects in space that is based on three-dimensional (3D) integral imaging, in which elemental images are calculated from a two-dimensional sampling of the optical field along different depths by use of confocal scanning microscopy. Experimental results are presented to demonstrate that a uniformly magnified 3D biological specimen can be displayed in space, and thus integral imaging can be used for 3D display of confocal microscopy. To the best of our knowledge, this is the first report of 3D integral imaging of (semitransparent) micro-objects.

Algorithms↗

PubMed2003

Large depth-of-focus time-multiplexed three-dimensional integral imaging by use of lenslets with nonuniform focal lengths and aperture sizes.

Conventional integral-imaging systems utilize lenslet arrays with fixed focal lengths and aperture sizes. We propose a time-multiplexed integral-imaging method that enhances both the depth of focus and the resolution of a three-dimensional image by displaying it with an array of lenslets with different focal lengths and aperture sizes. The nonuniform lenslet parameters (focal lengths and aperture sizes) for our method are calculated. Our theoretical analysis indicates that significant improvements in both depth of focus and resolution can be obtained with the proposed technique.

Journal Article↗

PubMed2003

Three-dimensional integral imaging with large depth of focus by use of real and virtual image fields.

We present an integral imaging method to enhance the depth of a three-dimensional image by displaying it throughout real and virtual image fields. When the product of depth and resolution square of the displayed three-dimensional image is used as a figure of merit in integral imaging systems, our method can maximize this merit especially when three-dimensional images with large depth of focus are displayed. The feasibility of our method is experimentally demonstrated by generation of elemental images by a computer.

Journal Article↗

PubMed2003

Improvement of viewing angle in integral imaging by use of moving lenslet arrays with low fill factor.

Lenslet arrays with a low fill factor can improve the viewing angle in integral imaging. However, the viewing resolution is degraded by low fill-factor lenslets because the spatial sampling rate of the ray information is reduced. We show that both the viewing resolution and the viewing angle of integral imaging can be improved by adopting a moving array-lenslet technique.

Journal Article↗

PubMed2002

Real-time all-optical three-dimensional integral imaging projector.

We present an all-optical three-dimensional integral imaging projector. An optically addressed spatial-light modulator is used, which potentially provides better image resolution than the conventional CCD and liquid-crystal display pair. We present experimental results using a liquid-crystal light valve.

Journal Article↗