• Korean Journal of Cognitive Science
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• v.14 no.3
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• pp.37-49
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• 2003

Most 3D display systems heavily depend on binocular disparity to produce 3-dimensional depth of a scene. In principle, the vergence angle of the object on fixation and binocular disparity of non-fixated objects vary with the inter-pupillary distance(IPD) of the observer. However, most stereo systems provide the identical stereo image pairs regardless of the observers' IPD, which may result in variation in the perceived depth. In this study, we manipulated the vergence angle of the fixated object and binocular disparity of the non-fixated object. The range of the individual difference in the perceived depth was found to be increased with the increase of disparity for both the fixated and non-fixated objects, and the individual difference was well fitted by the regression line of the observers' IPD. These results suggest that individual difference in the perceived depth from the identical stereo images should be greatly reduced if the stereo system calibrates the disparity of the object by the observers' IPD in generating the stereo images and the regression line found in this study might be useful in the calibrating the disparity of the images.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.426-429
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• 2015

입체카메라에서 줌 사용시 컨버전스 포인트의 움직임에 따라 발생되는 시각적 불편의 문제와 거리감의 변동을 해결하기 위해 컨버전스 포인트 조정기법을 제시했었다. 본 연구에서는 이러한 조정기법의 우수성을 입증하기 위해 정량적 평가인 주시특성 분석을 설계했다. 입체영상에 대한 주관평가를 사용자의 시선움직임을 통해 정량적으로 파악하게 된다면 입체에 대한 사용자의 감성이미지를 보다 정확하게 파악할 수 있으며 이러한 자료를 통해 사용자 중심의 입체영상을 제작할 수 있는 환경을 제공하는 것이 가능할 것이다. 이를 통해 제시된 기법의 우수성을 정성과 정량적으로 입증한다.

• Journal of Korean Ophthalmic Optics Society
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• v.21 no.1
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• pp.61-68
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• 2016

Purpose: This study investigated differences in stereoscopic fusional area between those with good and poor stereo acuity in viewing stereoscopic displays. Methods: Stereo acuity of 39 participants (18 males and 21 females, $23.6{\pm}3.15years$) was measured with the random dot stereo butterfly method. Participants with stereo-blindness were not included. Stereoscopic fusional area was measured using stereoscopic stimulus by varying the amount of horizontal disparity in a stereoscopic 3D TV. Participants were divided into two groups of good and poor stereo acuity. Criterion for good stereo acuity was determined as less than 60 arc seconds. Measurements arising from the participants were statistically analyzed. Results: 26 participants were measured to have good stereo acuity and 13 participants poor stereo acuity. In case of the stereoscopic stimulus farther than the fixation point, threshold of horizontal disparity for those with poor stereo acuity were measured to be smaller than the threshold for those with good stereo acuity, with a statistically significant difference. On the other hand, there was no statistically significant difference between the two groups, in case of the stereoscopic stimulus nearer to the fixation point. Conclusions: In viewing stereoscopic displays, the boundary of stereoscopic fusional area for the poor stereo acuity group was smaller than the boundary of good stereo acuity group only for the range behind the display. Hence, in viewing stereoscopic displays, participants with poor stereo acuity would have more difficulty perceiving the fused image at farther distances compared to participants with good stereo acuity.

• Journal of Korean Ophthalmic Optics Society
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• v.5 no.2
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• pp.49-53
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• 2000

Comparing to an Image test chart which printed from computer. Hahn's standard test chart and Chart project test chart propose to make the program of an image test chart in computer. Test type of the test chart should be programed by difference size which was examined Hangul program of Hangul & Computer Co. An image test of visual acuity most decreased among 3 kinds of testing. Testing of Fixation disparity was same between Diplopia test and chart project test chart, so that. Design of test chart could be programed diverse by Hangul program of Hangul & Computer Co.

• Korean Journal of Cognitive Science
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• v.12 no.4
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• pp.49-56
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• 2001

When multiple features are presented in the image the computational models for stereopsis select the most activated matches through the excitatory and inhibitory interactions among all possible matches. Using the random-dot stereogram with two surfaces. we investigate whether human binocular mechanism selects the most activated matches. The dots consisting a surface lying in a fixation plane were selected randomly while each of the dots consisting the other surface was paired with each of the original dots in the following manner. After finding the position of each dots in the original random pattern we placed an additional dot to the left and to the right of the original position in each of the left and right image of a stereogram respectively. The luminance of additional dots was varied while that of the original random dots was fixed so that the hypothetical matches presumably could be activated differently. Across the luminance condition the depth of each surface was measured to examine whether matches to be selected were changed depending on the activation level of possible matches. When the luminance of two patterns was within 30% of one another observers perceived an opaque surface. Beyond this value two transparent surfaces were seen with the magnitude of perceived depth varying with relative luminance of two patterns. When original pattern was brighter one additional surface was perceived at the depth corresponding to the disparity of original pattern. When original dot was dimmer. however the depth of an additional surface corresponded to the disparity of newly introduced pattern. These results suggest that there are dynamic interactions within the matching process whereby highly activated matches inhibit weaker one.

• Journal of Korean Ophthalmic Optics Society
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• v.11 no.1
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• pp.17-26
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• 2006

Video display units (VDU) are interfaces between computers and human operators. This study was performed to have a good understanding of the potential causes of eye problems in 50 students to enable them to perform an accurate assessment of the patient's visual performance while looking at a computer screen. The TSS Optometric Toolkit for Computer Users provides a powerful set of tools to enable eye care practitioners to assess visual performance under conditions that closely simulate a computer user's normal working conditions. The program consists of seven tests: Near vision chart, Sample text display, Spreadsheet display, Fixation disparity, Duochrome, Number search, Randolt Ring search. The results of this study show that 55% of the subjects do not have computer-related eye problems. It is apparent from this data that approximately 25% of all computer-related eye problems are attributable to the display screen, the workstation or inappropriate workpractices. Of the remaining cases, 20% of them will require general purpose spectacles and spectacles specifically for work at the computer. This study suggests that computer program, The TSS Optometric Toolkit for Computer Users, is very useful for assessment of computer-related eye problems.