• Title/Summary/Keyword: Flood Fill

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Real-time Spray Painting using Rays and Texture Map (레이와 텍스처 기법을 이용한 실시간 스프레이 페인팅)

  • Kim, Dae-Seok;Park, Jin-Ah
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.8
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    • pp.818-822
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    • 2008
  • The purpose of this study is to develop realistic painting simulation in real-time as well as to represent the thickness of the deposited paint on the surface. The Gaussian model is used for a painting deposition model to calculate the thickness of paints. For a painting simulation, rather than implementing particle systems, we propose a new heuristic algorithm for painting process based on a few number of rays. After we find the collision points of the rays with an environment, we compute the painted area using flood-fill searching method on the texture map and visualize paint effects. We analyzed time complexity of our method to verify that our system is suitable for real-time VR applications.

Emergency-response organization utilization of social media during a disaster: A case study of the 2013 Seoul floods

  • Kim, Ji Won;Kim, Yonghee;Suran, Melissa
    • Journal of Contemporary Eastern Asia
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    • v.14 no.2
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    • pp.5-15
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    • 2015
  • A growing number of studies have examined the relevance and impact of social media in building organizational resilience, which the ability to recover from a crisis, in the field of emergency management. However, few studies have assessed how these emergency response organizations perceive their own use of social media in crisis situations. In attempting to fill this gap, this study conducted a structured survey with emergency-response organization representatives in Seoul, South Korea, to examine how such organizations evaluate their utilization of social media in an urban emergency situation and how their social media uses are related to promoting organizational resilience during adverse events such as a flood. Overall, the findings imply that organizations are not yet taking full advantage of social media. Respondent evaluations of their own social media use in all three assessment areas-information provision, information dissemination, and emotional messages-were not satisfactory. However, their perceptions of how well they utilize social media were positively related to how they view their organizational resilience. Therefore, it may be that these organizations realize the powerful role of social media in building organizational resilience but lack the knowledge and experience to make the best use of social media services.

Division of the Hand and Fingers In Realtime Imaging Using Webcam

  • Kim, Ho Yong;Park, Jae Heung;Seo, Yeong Geon
    • Journal of the Korea Society of Computer and Information
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    • v.23 no.9
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    • pp.1-6
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    • 2018
  • In this paper, we propose a method dividing effectively the hand and fingers using general webcam. The method executes 4 times empirically preprocessing one to erase noise. First, it erases the overall noise of the image using Gaussian smoothing. Second, it changes from RGB image to HSV color model and YCbCr color model, executes a global static binarization based on the statistical value for each color model, and erase the noise through bitwise-OR operation. Third, it executes outline approximation and inner region filling algorithm using RDP algorithm and Flood fill algorithm and erase noise. Lastly, it erases noise through morphological operation and determines the threshold propositional to the image size and selects the hand and fingers area. This paper compares to existing one color based hand area division method and focuses the noise deduction and can be used to a gesture recognition application.

Spatial Analysis of Flood Rainfall Based on Kriging Technique in Nakdong River Basin (크리깅 기법을 이용한 낙동강 유역 홍수강우의 공간해석 연구)

  • Yoon, Kang-Hoon;Seo, Bong-Chul;Shin, Hyun-Suk
    • Journal of Korea Water Resources Association
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    • v.37 no.3
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    • pp.233-240
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    • 2004
  • Most of hydrological analyses in the field of water resources are launched by gathering and analyzing rainfall data. Several methods have been developed to estimate areal rainfall from point rainfall data and to fill missing or ungaged data. Thiessen and Reciprocal Distance Squared(RDS) methods whose parameters are only dependent on inter-station distance are classical work in hydrology, but these techniques do not provide a continuous representation of the hydrologic process involved. In this study, kriging technique was applied to rainfall analysis in Nakdong river basin in order to complement the defects of these classical methods and to reflect spatial characteristics of regional rainfall. After spatial correlation and semi-variogram analyses were performed to perceive regional rainfall property, kriging analysis was performed to interpolate rainfall data for each grid Thus, these procedures were enable to estimate average rainfall of subbasins. In addition, poor region of rainfall observation was analyzed by spatial interpolation error for each grid and mean error for each subbasin.

An Illumination and Background-Robust Hand Image Segmentation Method Based on the Dynamic Threshold Values (조명과 배경에 강인한 동적 임계값 기반 손 영상 분할 기법)

  • Na, Min-Young;Kim, Hyun-Jung;Kim, Tae-Young
    • Journal of Korea Multimedia Society
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    • v.14 no.5
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    • pp.607-613
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    • 2011
  • In this paper, we propose a hand image segmentation method using the dynamic threshold values on input images with various lighting and background attributes. First, a moving hand silhouette is extracted using the camera input difference images, Next, based on the R,G,B histogram analysis of the extracted hand silhouette area, the threshold interval for each R, G, and B is calculated on run-time. Finally, the hand area is segmented using the thresholding and then a morphology operation, a connected component analysis and a flood-fill operation are performed for the noise removal. Experimental results on various input images showed that our hand segmentation method provides high level of accuracy and relatively fast stable results without the need of the fixed threshold values. Proposed methods can be used in the user interface of mixed reality applications.

A Study on Flood Discharge Capacity and Hydraulic Characteristic of Labyrinth Weir as a Side-Channel Spillway (래버린스 웨어를 적용한 측수로형 여수로의 홍수배제능력 및 수리학적 특성 연구)

  • Park, Sae-Hoon;Moon, Young-Il
    • Journal of Korea Water Resources Association
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    • v.41 no.1
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    • pp.65-74
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    • 2008
  • The small and medium sized dams have the fill dam type of a lot of occasions, which are often weak in cases of major floods. For this reason, although a countermeasure is in great need, due to the importance of the facilities and financial situations, no direct safety measures have been taken. In this study, in order to minimize construction expenditure for practical safety measures in cases of major floods, the overflow section of spillway has been analyzed focusing on how the overflow capacity will increase in the case of partially rebuilding a part of the overflow section of spillway favorable for hydraulic conditions. The Labyrinth weir and movable weir was chosen for reconstruction models of the overflow section. Moreover, for analyzing the after-effects of the reconstruction, a small scale dam was temporarily chosen for various experiments such as the hydraulic model testing and the three dimension numerical evaluation through the use of Flow-3D.