• Journal of the Institute of Electronics and Information Engineers
• /
• v.53 no.1
• /
• pp.118-125
• /
• 2016

This study evaluates the performance of image to patient registration algorithm by using stereo vision and CT image for facial region surgical navigation. For the process of image to patient registration, feature extraction and 3D coordinate calculation are conducted, and then 3D CT image to 3D coordinate registration is conducted. Of the five combinations that can be generated by using three facial feature extraction methods and three registration methods on stereo vision image, this study evaluates the one with the highest registration accuracy. In addition, image to patient registration accuracy was compared by changing the facial rotation angle. As a result of the experiment, it turned out that when the facial rotation angle is within 20 degrees, registration using Active Appearance Model and Pseudo Inverse Matching has the highest accuracy, and when the facial rotation angle is over 20 degrees, registration using Speeded Up Robust Features and Iterative Closest Point has the highest accuracy. These results indicate that, Active Appearance Model and Pseudo Inverse Matching methods should be used in order to reduce registration error when the facial rotation angle is within 20 degrees, and Speeded Up Robust Features and Iterative Closest Point methods should be used when the facial rotation angle is over 20 degrees.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2011.01a
• /
• pp.69-72
• /
• 2011

본 논문에서는 방향 연결성 추적을 이용한 의사 특징점 제거에 관하여 연구하였다. 특징점을 추출하는 방법에는 교차수를 이용한 방법이 있다. 그러나 교차수를 이용한 방법에서는 의사 특징점이 많이 추출된다. 교차수를 이용한 방법에서 잘못 추출된 특징점들을 방향 연결성 추적을 이용한 의사 특징점 제거 알고리즘을 이용하여 의사 특징점을 제거하였다. 성능 평가를 위하여 교차수를 이용한 방법과 방향 연결성 추적을 이용하여 추출된 실제 특징점을 비교하였으며, 실험결과 방향 연결성 추적을 이용하여 많은 의사 특징점이 제거되었음을 알 수 있었다.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.8
• /
• pp.95-101
• /
• 2011

In this paper, using pixel connectivity tracking feature to remove a doctor has been studied. Feature extraction method is a method using the crossing. However, by crossing a lot of feature extraction method sis a doctor. Extracted using the method of crossing the wrong feature to remove them from the downside and the eight pixels around the fork to trace if it satisfies the conditions in the actual feature extraction and feature conditions are not satisfied because the doctor was removed. To evaluate the performance using crossing methods and extracted using pixel connectivity trace was compared to the actual feature, the experimental results using pixel connectivity trace arcuate sentence, croissants sentence, sentence the defrost feature on your doctor about47%, respectively, 40%, 30%were found to remove.

• Journal of Broadcast Engineering
• /
• v.21 no.1
• /
• pp.3-10
• /
• 2016

In this paper, two reconstructed point cloud sets with the information of 3D features are analyzed. For a certain 3D reconstruction of the interior of a building, the first image set is taken from the sequential passive camera movement along the regular grid path and the second set is from the application of the laser scanning process. Matched key points over all images are obtained by the SIFT(Scale Invariant Feature Transformation) algorithm and are used for the registration of the point cloud data. The obtained results are point cloud number, average density of point cloud and the generating time for point cloud. Experimental results show the necessity of images from the additional sensors as well as the images from the camera for the more accurate 3D reconstruction of the interior of a building.

• Journal of Pharmaceutical Investigation
• /
• v.37 no.3
• /
• pp.137-148
• /
• 2007

Using a strain-controlled rheometer [Rheometrics Dynamic Analyzer (RDA II)], the steady shear flow properties of a semi-solid ointment base (vaseline) have been measured over a wide range of shear rates at temperature range of $25{\sim}60^{\circ}C$. In this article, the steady shear flow properties (shear stress, steady shear viscosity and yield stress) were reported from the experimentally obtained data and the effects of shear rate as well as temperature on these properties were discussed in detail. In addition, several inelastic-viscoplastic flow models including a yield stress parameter were employed to make a quantitative evaluation of the steady shear flow behavior, and then the applicability of these models was examined by calculating the various material parameters (yield stress, consistency index and flow behavior index). Main findings obtained from this study can be summarized as follows : (1) At temperature range lower than $40^{\circ}C$, vaseline is regarded as a viscoplastic material having a finite magnitude of yield stress and its flow behavior beyond a yield stress shows a shear-thinning (or pseudo-plastic) feature, indicating a decrease in steady shear viscosity as an increase in shear rate. At this temperature range, the flow curve of vaseline has two inflection points and the first inflection point occurring at relatively lower shear rate corresponds to a static yield stress. The static yield stress of vaseline is decreased with increasing temperature and takes place at a lower shear rate, due to a progressive breakdown of three dimensional network structure. (2) At temperature range higher than $45^{\circ}C$, vaseline becomes a viscous liquid with no yield stress and its flow character exhibits a Newtonian behavior, demonstrating a constant steady shear viscosity regardless of an increase in shear rate. With increasing temperature, vaseline begins to show a Newtonian behavior at a lower shear rate range, indicating that the microcrystalline structure is completely destroyed due to a synergic effect of high temperature and shear deformation. (3) Over a whole range of temperatures tested, the Herschel-Bulkley, Mizrahi-Berk, and Heinz-Casson models are all applicable and have an almostly equivalent ability to quantitatively describe the steady shear flow behavior of vaseline, whereas the Bingham, Casson,and Vocadlo models do not give a good ability.

• Journal of the Korean Geographical Society
• /
• v.38 no.4
• /
• pp.575-590
• /
• 2003

It was the landscape phase that social relations were extended by production of landscapes during the 16C～17C. Core lineage groups in study area had extended socio-spatial nexus through making of the landscape of ‘authority-ostentation’(권력-과시형 경관) and of ‘kindness-civilization’(시혜ㆍ교화형 경관). Therefore they could gain a result that their power and authority took root in community perfectly. In the case of the Kims of Kwangsan(광산김씨), the first landscape of ‘kindness-civilization’ was Jungheodang(the learning room Jungheo), and next it was built Yangsungdang(the learning room Yangsung), and Imlijung(the pavilion Imli). Through this landscape production, the consciousness of scholastic genealogy was born, and this genealogy consciousness could be deepened and extended in regional scale. One more important feature in this phase is the point that the Kims of Kwangsan in Yeonsan area and the Songs of Unjin(은진송씨) in Hoiduk area could unite socially by the landscape production of ‘kindness-civilization type’ becoming intermediation. And these social union, that is to say, it do connote enlargement of the territoriality. It tells that community of ‘regional’ scale was formed by of core lineage groups of ‘local’ uniting each other.