• Title/Summary/Keyword: Local watershed

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Local Watershed and Region Merging Algorithm for Object Segmentation (객체분할을 위한 국부적 워터쉐드와 영역병합 알고리즘)

  • Yu, Hong-Yeon;Hong, Sung-Hoon
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.299-300
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    • 2006
  • In this paper, we propose a segmentation algorithm which combines the ideas from local watershed transforms and the region merging algorithm based hierarchical queue. Only the process of watershed and region merging algorithm can be restricted area. A fast region merging approach is proposed to extract the video object from the regions of watershed segmentation. Results show the effectiveness and convenience of the approach.

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The Improved Watershed Algorithm using Adaptive Local Threshold (적응적 지역 임계치를 이용한 개선된 워터쉐드 알고리즘)

  • Lee Seok-Hee;Kwon Dong-Jin;Kwak Nae-Joung;Ahn Jae-Hyeong
    • Proceedings of the Korea Information Processing Society Conference
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    • 2004.11a
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    • pp.891-894
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    • 2004
  • This paper proposes an improved image segmentation algorithm by the watershed algorithm based on the local adaptive threshold on local minima search and the fixing threshold on label allocation. The previous watershed algorithm generates the problem of over-segmentation. The over-segmentation makes the boundary in the inaccuracy region by occurring around the object. In order to solve those problems we quantize the input color image by the vector quantization, remove noise and find the gradient image. We sorted local minima applying the local adaptive threshold on local minima search of the input color image. The simulation results show that the proposed algorithm controls over-segmentation and makes the fine boundary around segmented region applying the fixing threshold based on sorted local minima on label allocation.

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The Watershed Image Segmentation Iteration Method (개선된Watershed영상분할방법)

  • 권기홍
    • Journal of the Korea Computer Industry Society
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    • v.4 no.12
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    • pp.923-928
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    • 2003
  • A severe drawback to the calculation of watershed images is over segmentation. Relevant object contours are lost in a sea of irrelevant ones. This is partly caused by random noise, inherent to a data, which gives rise to additional local minima, such that many catchments basins are further subdivided. Proposed watershed image segmentation algorithm is iteratively merging neighboring regions that have similar gray level distributions, to restore image.

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Economical Analysis for the Integrated Watershed Sewage Works Program in the Sample Area (표본지역에서의 유역별 통합 하수도정비에 따른 경제적 효과 분석)

  • Yoon, Hyun-Sik;Kim, Duk-Jin;Lee, kwan-Yong
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.4
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    • pp.565-578
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    • 2012
  • Integrated watershed sewage works program(IWSWP) is defined as implementing, by one of local governments or central government, sewage facilities planning, installation and management for a certain watershed in which criteria of water quality is established and two or more local governments are involved. It is shown that IWSWP is more efficient for the improvement of water quality of water body than conventional local sewage works program(CLSWP) and besides, economical benefits can be achieved by integration of facilities and M&O. In this research, case study for 8 watershed area were investigated to evaluate the difference of effect between IWSWP and CLSWP. The research shows that IWSWP has the money saving result of approximately 12 % by cost reduction for sewage works investment. B/C analysis result shows that B/C ratio of IWSWP was 1.749 and it is higher than B/C ratio of 1.439 for CLSWP. At the same time, the B/C sensitivity analysis is carried out for the rate of discount and the recreational use benefit.

Framework of Watershed Management Organization Consortium for Water Environment Improvement of Small Rural Watershed (농촌 소유역 수환경 개선을 위한 유역관리 협의체 구성방안 - 함평천 사례를 중심으로 -)

  • Lee, Ki-Wan;Kim, Young-Joo;Yoon, Kwang-Sik
    • Journal of Korean Society of Rural Planning
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    • v.11 no.4 s.29
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    • pp.59-65
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    • 2005
  • Proper management of small rural watershed is important since it does affect water quality improvement of larger scale watershed. Therefore, effective small watershed management guideline including participatory program of local people is required to achieve water environment improvement. Feasibility of water quality goal, short and long-term watershed management plan and funding sources were investigated by field monitoring of Hampyungchun watershed which has characteristics of rural stream, and literature review. The relevant parties and their roles fer watershed management were identified and suggested. A hybrid model, that is mixture of government driven model and NGO model, is recommended for watershed management organization in this study.

Block-Based Predictive Watershed Transform for Parallel Video Segmentation

  • Jang, Jung-Whan;Lee, Hyuk-Jae
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.12 no.2
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    • pp.175-185
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    • 2012
  • Predictive watershed transform is a popular object segmentation algorithm which achieves a speed-up by identifying image regions that are different from the previous frame and performing object segmentation only for those regions. However, incorrect segmentation is often generated by the predictive watershed transform which uses only local information in merge-split decision on boundary regions. This paper improves the predictive watershed transform to increase the accuracy of segmentation results by using the additional information about the root of boundary regions. Furthermore, the proposed algorithm is processed in a block-based manner such that an image frame is decomposed into blocks and each block is processed independently of the other blocks. The block-based approach makes it easy to implement the algorithm in hardware and also permits an extension for parallel execution. Experimental results show that the proposed watershed transform produces more accurate segmentation results than the predictive watershed transform.

Establishment of Role Between Central and Local Government for Implementation of Total Maximum Daily Load (수질오염총량관리제 시행에 있어서 중앙정부와 지방자치단체 간 역할정립)

  • Yi, Sang-Jin
    • Journal of Korean Society of Environmental Engineers
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    • v.33 no.5
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    • pp.378-383
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    • 2011
  • The policy of total maximum daily load (TMDL) was adopted to manage water pollutants so as to keep the total amount of pollutants in the watersheds within established target water quality. While the TMDL was implemented in all four major river basins, various problems occurred. Even though the corrections for problems were conducted, the role between central and local government was not established exactly. This study was presented to suggest a role between central and local governments for effective implementation of TMDL. When the central government establishes the environmental criteria with water quality standards and pollutants in the main rivers, the local government should establish the level of target pollutants in the watershed. Also, the local government should be continuously implementing the water quality and flowrate monitoring of the tributaries to find out the degree of water quality improvement in the tributaries. Especially, the basic plan of TMDL for the whole watershed should be established by the river basin environmental office at the central government. The local government should be established the implementation plan of TMDL for the watershed where exceeds the established target water quality. The performance assessment of TMDL should be implemented every year to the water quality and flowrate monitoring of the tributaries for satisfaction assessment of target water quality in the watershed by the lower-lever government. The performance assessment report of TMDL included with an analysis of causes for the excess water quality in the watershed should be submitted to the river basin environmental office at the end of the TMDL planning period.

Necessity of Adjustment of the Jurisdiction of Local Governments based on Watershed (유역(流域)을 기초로 한 행정구역경계설정의 필요성)

  • Lee, Won-Young
    • Journal of Environmental Impact Assessment
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    • v.10 no.3
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    • pp.245-255
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    • 2001
  • The management of water, both the quantity and the quality, has been one of the most important issues in the public investment and it is equally true in the field of sustainable development. Nevertheless, the jurisdiction of local governments has been delineated without much attention to the issue of the water management. In the planning of wide areas such as cities, countries, the metropolis, and the megalopolis, it is necessary to well arrange the geographical jurisdiction of local governments as a unit of region. The river water system, including small streams to large rivers, should be given its due share in the planning and jurisdictional delineation. The traditional concept of the local government's jurisdiction emphasizing the accessibility may be fading away. Instead, the efficiency of the public management would be the main concept in determining the jurisdiction of local governments. The river improvement, the waterworks, the sewage, the maintenance of water quality, the space of water recreation, are relatively important in the efficient management of that area. This paper argues for the equalization between the geographical jurisdiction of local governments and watersheds. To this end, I do case studies of the local governments areas such as Ri(里), Eup Myon(邑 面), Si Gun(市 郡), KyangyokSi Do(廣域市 道). The study interprets ARS will be one of the principles of land use and the reorganization of the local jurisdiction in the future as a geo-systematic and the eco-systematic criteria.

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Strategies for utilizing Urban Ventilation Corridor considering Local Cold Air in Watershed Areas - A Case Study of Uijeongbu and Gwacheon - (유역의 찬공기 특성을 고려한 도시 바람길 활용 전략 - 경기도 의정부 및 과천 일대를 사례로 -)

  • EUM, Jeong-Hee
    • Journal of the Korean Association of Geographic Information Studies
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    • v.22 no.2
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    • pp.133-151
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    • 2019
  • This study aims to analyze cold air characteristics in the watershed areas and to suggest strategies for utilizing them in urban ventilation corridor plans. For this purpose, the Jungnangcheon watershed and Uijeongbu-si in the northern part of Gyeonggi province, and Anyangcheon watershed as well as Yangjaecheon Tancheon watershed and Gwacheon-si in the southern part were selected as study areas. We used KALM (Kaltluftabflussmodell), a cold air simulation model developed in Germany and identified both the cold air flow and the height of cold air layer generated during 6 hours at night. Uijeongbu City is located on the main stream of the Jungnangcheon watershed, and the local cold air from the southern outskirts is an important part of Uijeongbu-si's overall ventilation corridor planning. In addition, the cold air generated in the vicinity of Mt. Sapae flows into the central business district near the city hall and plays a major role in regulating the thermal environment of the city. But, the cold air flows in the eastern part of Uijeongbu-si was not smoothly. The cold air flow generated in the east of Gwanak Mountain and in the west of Cheonggye Mountain was the most active in the northern part of Gwacheon-si. This flow is also a major ventilation corridor in Anyangcheon watershed as well as Yangjaecheon Tancheon watershed. But, the southern part where the cold air flow is not smooth is planed to be developed as 'Gwacheon Knowledge Information Town Public Housing District', so rapid development is expected in the future. Hence, it is suggested that an additional ventilation corridor plan should be established based on the detailed local wind flow analysis.

An Enhancement of Image Segmentation Using Modified Watershed Algorithm

  • Kwon, Dong-Jin
    • International journal of advanced smart convergence
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    • v.11 no.4
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    • pp.81-87
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    • 2022
  • In this paper, we propose a watershed algorithm that applies a high-frequency enhancement filter to emphasize the boundary and a local adaptive threshold to search for minimum points. The previous method causes the problem of over-segmentation, and over- segmentation appears around the boundary of the object, creating an inaccurate boundary of the region. The proposed method applies a high-frequency enhancement filter that emphasizes the high-frequency region while preserving the low-frequency region, and performs a minimum point search to consider local characteristics. When merging regions, a fixed threshold is applied. As a result of the experiment, the proposed method reduced the number of segmented regions by about 58% while preserving the boundaries of the regions compared to when high frequency emphasis filters were not used.