• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.201-203
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• 2015

편안한 3차원 입체영상 콘텐츠 제작을 위해선 시청 환경 조건에 부합하는 최적의 제작 방법을 필요로 한다. 현재의 입체영상 제작 과정은 경험자의 지식이나 시청자 실험에 기반 한 가이드라인들을 활용하고 있으나, 특정 제작 환경에 국한되어 있다. 보다 구체적이고 정량적인 가이드라인 도출을 위해선 다양한 카메라 제어 및 시청 환경 요소를 고려한 실험용 입체영상이 제작되고, 그 실험 영상을 기반으로 다양한 시청자 실험 데이터가 구축되어야 한다. 또한, 실험용 입체영상 제작은 단기간에 이루어지고, 실험 목적 변경에 따라 변화 요인을 수용할 수 있어야 한다. 본 논문에서는 다양한 실험용 입체영상 제작을 위해, 상업용 3D 게임 엔진 저작 툴(Unity3D)에서 운용되고, 깊이예산(Depth Budget) 제어가 쉽게 가능한 입체 카메라 모듈을 구현하고, 구현된 모듈을 활용한 입체영상의 제작 예를 보여준다.

• The KIPS Transactions:PartB
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• v.18B no.3
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• pp.139-146
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• 2011

The color correction is the important process of influencing on the picture quality of the 3D stereoscopic images. Existing colorcorrecting methods handle the processing intensifying a correspondence among a left and right image using a histogram based on any one side. In case of color correction based on a histogram, it is difficult to correct tone of image, because the color temperature is not converted enough. And in this paper, the color temperature correction and color consistency correction is proposed without using histogram. The proposed color correction method by color temperature gives 3 in CIE-${\Delta}E$ for each pixel on the images captured with same illuminants and the conventional gives similar results. For color consistency, the proposed gives 9 in CIE-${\Delta}E$ on the images captured with different illuminants while the conventional gives 18. The proposed method shows better results than the conventional in color consistency processing.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.3
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• pp.299-305
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• 2011

Purpose: In watching 3D stereoscopic display using the binocular disparity, effect of difference of the pupillary distance between the adults and children on the perception of depth were investigated. Methods: The average PD of children was determined from the PD measurements of children of the elementary school of 2nd and 3rd grade in Seoul. The location of crossing visual axes were derived from the relation of the binocular disparity and the PD for the adults and children. Results: The average PD of the children was measured to be 57.3 mm which was smaller than the average PD of the adults that was known to be about 65 mm. As the binocular disparity increases to the positive direction, the crossing location steeply moves farther behind the screen. On the other hand, when the binocular disparity increases to the negative direction, the crossing location gradually moves toward the viewer. For the same amount of the binocular disparity, the crossing locations were derived to be larger for the children than the adults due to the difference of the PD. Therefore, children will perceive larger depth than the adults. Conclusions: Small PD of the viewer causes the larger amount of the depth perception. In producing the stereoscopic images, the average PD of children as well as adults need to be considered.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.156-157
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• 2010

최근 새로운 영상시장의 개척과 디지털 기술의 발전에 더불어 차세대 3D 입체영상기술에 대한 관심 및 수요가 증가함에 따라 높은 질의 입체영상 구현을 위한 연구들이 활발히 이루어지고 있다. 입체영상을 구현함에 있어 3D 입체 카메라 시스템의 기술이 중요한 요소로 작용되며, 특히 좌/우 영상 확보 및 카메라 동조, 결합시키는 특수 장비인 입체 카메라 리그 시스템 기술에 대한 연구 및 개발이 국내외에서 활발히 진행되고 있다 본 논문에서는 3D 입체영상 구현을 위한 카메라 리그 시스템의 원리 및 구조에 대해서 기술하고, 국내외 기술개발 동향을 살펴본다. 이에 높은 양질의 입체영상 구현을 위한 3D 입체 카메라 리그 시스템 기술의 개발 방향을 제시하고자 한다.

• Proceedings of the KIEE Conference
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• 1998.11b
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• pp.511-513
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• 1998

This paper describes a full color stereoscopic video display system using a LCD shutter. Human apprehends the world with a natural stereo vision. The left eye sees through a slightly different perspective from the right eye; proposed vision system combines two images into a single image that has stereo depth. That is, when the left image is on the screen, the left shutter opens and the right shutter closes - and vice versa. The LCD shutter channels the left image to the left eye, and the right image to the right eye. The brain then fuses the stereo pair into a single high-resolution, flicker-free 3D image. The designed vision system is a real-time system that shows stereoscopic images without the loss of image information from video cameras.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.37-42
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• 2018

With advancements in digital image production technology, the branch of stereoscopic image technology has also been undergoing active development. Accordingly, research and development on cutting-edge display products for mounting stereoscopic images are currently being pursued. There are various problems that can occur when viewing 3D images. Because viewers feel visual fatigue while perceiving the depth of the images provided via an artificial method, a negative human factor such as visual fatigue has become one of the most prominent concerns, especially as it is a factor that affects the ongoing maintenance of 3D images. Therefore, by identifying the factors affecting the depth of the graphic images provided in 2D images, and subsequently using this information to develop an image processing method, we conducted depth-related experiments and analysed them under the assumption that stereoscopic images could be reproduced without visual fatigue. Thus, we analysed the most significant factors related to depth and verified the interactions by performing depth-related factors-based ANOVA variance analysis by differentially applying the texture, colour temperature, and contrast ratio to graphic images. We determined the significance of the factors related to depth and proposed a method to improve depth based on an analysis of the results of the experiments conducted in this study.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.40-41
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• 2012

양안식 3D 영상 시청 안정성에 대해 제기되고 있는 지속적인 이슈는 3D 영상 시장 활성화를 위해 반드시 선결 되어야 하는 과제이다. 최근, 이를 위해 양안식 3D 영상이 유발하는 시각적 불편함을 측정하고 이를 예측하는 연구가 활발히 진행되고 있다. 본 논문에서는 양안식 3D 영상에서 시각적 불편함을 야기하는 문제 영역의 양안 시차 변화에 따른 주관적 시각적 불편함을 측정한다. 이를 통하여 양안식 3D 영상에서 시각적 불편함을 주는 문제 영역의 영상 특성이 시청자가 인지하는 시각 피로에 지배적인 영향을 미칠 수 있음을 실험적으로 증명한다.

• Journal of Information Display
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• v.8 no.4
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• pp.23-26
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• 2007

A natural 3D image is considered by many people to be next-step in evolution of displays. This paper introduces autostereoscopic 3D of 60-view number, which is made using slanted lenticular lens array and LCD of 15.1 inch diagonal size and 3200 by 2400 pixel numbers and presents the results of our prototype. Due to its large view number, smooth motion parallax is observed and the visual fatigue is reduced.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.2
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• pp.728-741
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• 2015

Stereo vision has become an important technical issue in the field of 3D imaging, machine vision, robotics, image analysis, and so on. The depth map extraction from stereo video is a key technology of stereoscopic 3D video requiring stereo correspondence algorithms. This is the matching process of the similarity measure for each disparity value, followed by an aggregation and optimization step. Since it requires a lot of computational power, there are significant speed-performance advantages when exploiting parallel processing available on processors. In this situation, multi-core CPU may allow many parallel programming technologies to be realized in users computing devices. This paper proposes parallel implementations for calculating disparity map using a shared memory programming and exploiting the streaming SIMD extension technology. By doing so, we can take advantage both of the hardware and software features of multi-core processor. For the performance evaluation, we implemented a parallel SAD algorithm with OpenMP and SSE2. Their processing speeds are compared with non parallel version on stereoscopic streaming video. The experimental results show that both technologies have a significant effect on the performance and achieve great improvements on processing speed.

• Journal of the Society of Naval Architects of Korea
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• v.44 no.6
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• pp.579-589
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• 2007

Contrary to the conventional single-point measuring devices such as LDV, pitot-tube, hot-wire, etc., it would be possible to measure instantaneously 3-D flow fields with a stereoscopic PIV system. In this paper, we present an analysis algorithm for a stereoscopic PIV system using the normalized cross-correlation (NCC) and a 3-D calibration based reconstruction method. The evaluation method based on NCC is one of the most accurate correlation-based methods. We validated the developed algorithm through a benchmarking comparison with 3-D artificial SPIV images and calibration target images.