Ji-Seong Jeong

High speed image space parallel processing for computer-generated integral imaging system

In an integral imaging display, the computer-generated integral imaging method has been widely used to create the elemental images from a given three-dimensional object data. Long processing time, however, has been problematic especially when the three-dimensional object data set or the number of the elemental lenses are large. In this paper, we propose an image space parallel processing method, which is implemented by using Open Computer Language (OpenCL) for rapid generation of the elemental images sets from large three-dimensional volume data. Using the proposed technique, it is possible to realize a real-time interactive integral imaging display system for 3D volume data constructed from computational tomography (CT) or magnetic resonance imaging (MRI) data.

Simplified Integral Imaging Pickup Method for Real Objects Using a Depth Camera

In this paper, we present a novel integral imaging pickup method. We extract each pixels actual depth data from a real objects surface using a depth camera, then generate elemental images based on the depth map. Since the proposed method generates elemental images without a lens array, it has simplified the pickup process and overcome some disadvantages caused by a conventional optical pickup process using a lens array. As a result, we can display a three-dimensional (3D) image in integral imaging. To show the usefulness of the proposed method, an experiment is presented. Though the pickup process has been simplified in the proposed method, the experimental results reveal that it can also display a full motion parallax image the same as the image reconstructed by the conventional method. In addition, if we improve calculation speed, it will be useful in a real-time integral imaging display system.

Real-time 3D display system based on computer-generated integral imaging technique using enhanced ISPP for hexagonal lens array

This paper proposes an open computer language (OpenCL) parallel processing method to generate the elemental image arrays (EIAs) for hexagonal lens array from a three-dimensional (3D) object such as a volume data. Hexagonal lens array has a higher fill factor compared to the rectangular lens array case; however, each pixel of an elemental image should be determined to belong to the single hexagonal lens. Therefore, generation for the entire EIA requires very large computations. The proposed method reduces processing time for the EIAs for a given hexagonal lens array. By using the proposed image space parallel processing (ISPP) method, it can enhance the processing speed that generates the 3D display of real-time interactive integral imaging for hexagonal lens array. In our experiment, we implemented the EIAs for hexagonal lens array in real-time and obtained a good processing time for a large of volume data for multiple cases of lens arrays.

Resolution-enhancement for an orthographic-view image display in an integral imaging microscope system.

Due to the limitations of micro lens arrays and camera sensors, images on display devices through the integral imaging microscope systems have been suffering for a low-resolution. In this paper, a resolution-enhanced orthographic-view image display method for integral imaging microscopy is proposed and demonstrated. Iterative intermediate-view reconstructions are performed based on bilinear interpolation using neighborhood elemental image information, and a graphics processing unit parallel processing algorithm is applied for fast image processing. The proposed method is verified experimentally and the effective results are presented in this paper.

Development of a real-time integral imaging display system based on graphics processing unit parallel processing using a depth camera

Abstract. A depth camera has been used to capture the depth data and color data for real-world objects. As an integral imaging display system is broadly used, the elemental image array for the captured data needs to be generated and displayed on liquid crystal display. We proposed a real-time integral imaging display system using image processing to simplify the optical arrangement and graphics processing unit parallel processing to reduce the time for computation. The proposed system provides elemental images generated at a rate of more than 30 fps with a resolution of 1204×1204  pixels, where the size of each display panel pixel was 0.1245 mm, and an array of 30×30  lenses, where each lens was 5×5  mm.

Real-time interactive display for integral imaging microscopy

A real-time interactive orthographic-view image display of integral imaging (II) microscopy that includes the generation of intermediate-view elemental images (IVEIs) for resolution enhancement is proposed. Unlike the conventional II microscopes, parallel processing through a graphics processing unit is required for real-time display that generates the IVEIs and interactive orthographic-view images in high speed, according to the user interactive input. The real-time directional-view display for the specimen for which 3D information is acquired through II microscopy is successfully demonstrated by using resolution-enhanced elemental image arrays. A user interactive feature is also satisfied in the proposed real-time interactive display for II microscopy.

Hand Gesture User Interface for Transforming Objects in 3D Virtual Space

Generally, users have controlled objects in a 3D virtual space by using a mouse and a keyboard. However, it is not easy to carry out actions in 3D virtual space through the devices since others could be used to communicate about some issues. Therefore, in this paper, we propose a system in which hand gestures of users can be used to control objects. In the proposed system, an object can be picked up through a specific hand gesture, and it can then be translated, rotated, and scaled in x, y, z directions according to the recognized hand gestures.

Development of Ontology for the Diseases of Spine

KISTI is carrying out an e-Spine project for spinal diseases to prepare for the aged society, so called NAP.

Development of a 3D Virtual Studio System for Experiential Learning

This paper proposes a three-dimensional (3D) virtual studio system that supports various types of experiential learning using chroma keying and real-time 3D virtual reality techniques. The objective of the proposed system is to maximize learning, especially self-directed learning, and to promote student motivation by improving several technical problems inherent to previously developed virtual education systems. The main improvements are the system speed, the quality of 3D virtual spaces, and the control technique of the user interface with the addition of a speech recognition function. The proposed system was applied and practically used in English classes at several elementary schools in Korea. The results indicated that the proposed system can provide a learning environment in which students can engage in more efficient self-directed learning by enhancing their engagement in the learning process.

WeWhere:A Multiple User Location Tracking System of Smart Phones

According that smart phones have been widely used, their users can easily access various information around the devices through location information services equipped to the smart phone devices. In this paper, we propose a WeWhere which is a system of client-server model for providing the current location among several smart phone users in real time. A client-side smartphone user send to a server his/her current location obtained by applying location information service provided from smart phones and receive location information of all smartphone users connected to the user from the server. The all location information is displayed on a smartphone of a user in client-side and users can track location of their related users. All most 200,000 persons in the world have used the proposed system, WeWhere, normally without overloading of a server system.