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변정현(Byun, Jung-Hyun),채승호(Chae, Seung-Ho),최희승(Choi, Hee-seung),한탁돈(Han, Tak-Don) 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
컴퓨터 비전 연구에서 객체 추적은 활발히 연구되는 주제 중 하나이다. 기존의 객체 추적 연구는 이미지 매칭 기반으로 대상을 추적하는 방식이 많이 이용하기 때문에 주로 정형 객체 추적(rigid tracking) 에 집중한다. 이와 달리 tracking-by-detection 방법은 추적 문제를 분류기를 이용한 검출 문제처럼 다루기 때문에 비정형 객체 추적(non-rigid tracking)을 수행하는데 효과적이다. 본 논문에서는 이러한 tracking-by-detection 방법 중 하나로 structured output Support Vector Machine(SVM) 을 활용하는 Struck [1]의 분석하고 보완하는 연구를 진행하였다. Struck 은 일반적인 상황에서는 우수한 추적 성능을 보여주지만 크기 변화에 대응할 수 없고, 가림 현상이 일어나 추적 대상이 화면에 보이지 않을 때도 무조건 학습을 진행한다. 따라서 background clutter 와 잘못된 학습으로 인해 추적과 학습에 drift 가 일어날 수 있다. 본 연구에서는 이러한 Struck 의 단점을 보완하기 위해 추적 대상의 크기에 맞춰 추적 상자의 크기를 조절해 background clutter 를 방지하고 크기변화에 대응하는 scale-adaptive tracking 방법을 제안한다. 후속 연구로는 SVM 의 평가 함수 점수의 임계값을 이용하는 F score with threshold 방법을 이용하여 대상이 가려졌는지 여부를 확인해 잘못된 학습을 방지할 수 있다는 것을 보여준다. 또한 이러한 비정형 객체 추적을 활용할 수 있는 응용분야를 제시하고자 한다. Object tracking is one of many popular topics in computer vision literature. Previous object tracking studies mainly utilized image-matching based tracking method so that they focus on rigid tracking. Tracking-by-detection on the other hand treats a tracking problem as a detection problem using a classifier making it more suitable for non-rigid tracking. In this paper, we conducted the study analyzing and complementing Struck [1], a tracking-by-detection method that utilizes the structured output SVM. Struck shows good tracking performance in normal occasions; however, it can suffer drift from background clutter since it cannot cope with scale change and from occlusion since it forces learning even though there is no object presence in the scene. In this paper, to solve these issues for Struck, we propose “scale-adaptive tracking” method that automatically adjusts the size of the bounding box according to that of the object. As a future work, we propose “F score with threshold” method that can detect occlusion and prevents SVM from false-positive learning. Also, we propose various applications for non-rigid tracking.
LLP+: Multi-Touch Sensing Using Cross Plane Infrared Laser Light for Interactive Based Displays
박제희(James Park),서종훈(Jonghoon Seo),채승호(Seung Ho Chae),김하영(Hayoung Kim),한탁돈(Tackdon Han) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
Multi-touch sensing exists in a number of applications and is presently used in personal computing devices (i.e. Laptops and desktop computers), mobile touch screens, kiosks, interactive wall displays (i.e. subway station map), ATMs, and any display requiring an interactive platform. Current multi-touch sensing methods use capacitive and or resistive based touchscreens both which are expensive and difficult to make. Infrared based touchscreens is being studied as an alternative method that is effective and low-cost solution of producing equal results particularly with large interactive displays. Previous research using infrared based touch screens is not new and has been studied using several implementations and a trade-off decision must be made when considering which technology to use. Our approach combines two infrared based technologies together to effectively eliminate limitations placed on the touch screen when only one implementation is used and reduces the complexity of design and cost.
유남재,정길수,김상진,채승호 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B
This paper is results of extensive centrifuge model experiments about design factors influencing the bearing capacity and the settlement behaviors of SCP (Sand Compaction Pile). Centrifuge model tests were carried out changing design factors for SCP method such as replacement area ratio (as= 20, 40, 70%), improvement ratio to footing width (W/B = 1, 2, 3), and amount of fines in sand pile (#200 = 5, 10, 15). Therefore, the effects of these design factors on the bearing capacity and the settlement behavior of SCP were investigated and changes of stress concentratio rato due to such an design factors were also investigated. Centrifuge model testing technique for preparing and installing centrifuge model of sand compaction pile, using freezing them, was also developed. As results of centrifuge model tests, more fines in sand compaction pile increases the bearing capacity of SCP. Optimum improvement ratio to footing width was found to be 2. Values of stress concentration ratio was in the ranges of 1.5 - 3.5. The depth of bulging in sand piles was found in the range of 2.0 - 2.5 times of pile diameter.