• Title/Summary/Keyword: 다중경계

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Past Block Matching Motion Estimation based on Multiple Local Search Using Spatial Temporal Correlation (시공간적 상관성을 이용한 국소 다중 탐색기반 고속 블록정합 움직임 추정)

  • 조영창;남혜영;이태홍
    • Journal of Korea Multimedia Society
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    • v.3 no.4
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    • pp.356-364
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    • 2000
  • Block based fast motion estimation algorithm use the fixed search pattern to reduce the search point, and are based on the assumption that the error in the mean absolute error space monotonically decreases to the global minimum. Therefore, in case of many local minima in a search region we are likely to find local minima instead of the global minimum and highly rely on the initial search points. This situation is evident in the motion boundary. In this paper we define the candidate regions within the search region using the motion information of the neighbor blocks and we propose the multiple local search method (MLSM) which search for the solution throughout the candidate regions to reduce the possibilities of isolation to the local minima. In the MLSM we mark the candidate region in the search point map and we avoid to search the candidate regions already visited to reduce the calculation. In the simulation results the proposed method shows more excellent results than that of other gradient based method especially in the search of motion boundary. Especially, in PSNR the proposed method obtains similar estimate accuracy with the significant reduction of search points to that of full search.

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Fine Registration between Very High Resolution Satellite Images Using Registration Noise Distribution (등록오차 분포특성을 이용한 고해상도 위성영상 간 정밀 등록)

  • Han, Youkyung
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.35 no.3
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    • pp.125-132
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    • 2017
  • Even after applying an image registration, Very High Resolution (VHR) multi-temporal images acquired from different optical satellite sensors such as IKONOS, QuickBird, and Kompsat-2 show a local misalignment due to dissimilarities in sensor properties and acquisition conditions. As the local misalignment, also referred to as Registration Noise (RN), is likely to have a negative impact on multi-temporal information extraction, detecting and reducing the RN can improve the multi-temporal image processing performance. In this paper, an approach to fine registration between VHR multi-temporal images by considering local distribution of RN is proposed. Since the dominant RN mainly exists along boundaries of objects, we use edge information in high frequency regions to identify it. In order to validate the proposed approach, datasets are built from VHR multi-temporal images acquired by optical satellite sensors. Both qualitative and quantitative assessments confirm the effectiveness of the proposed RN-based fine registration approach compared to the manual registration.

Building boundary detection using image segmentation and disparity map (영상 분할과 변이 지도를 이용한 건물 경계선 검출)

  • Ye Chul-Soo
    • Proceedings of the KSRS Conference
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    • 2006.03a
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    • pp.169-172
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    • 2006
  • 본 논문에서는 1m 해상도의 위성영상으로부터 건물의 경계선을 검출하기 위해 영상분할과 변이지도(disparity map)를 이용하는 새로운 방법을 제안한다. Watershed 방법으로 영상을 분할하고 분할된 영역 내부의 변이를 다중정합창틀(multiple matching window)과 결합된 다차원특징벡터정합(multi-dimensional feature vector matching)을 이용하여 계산한다 분할된 인접 영역들 가운데 panchromatic 및 multispectral 밝기값과 변이의 평균값이 유사하면 두 영역을 결합하여 하나의 영역을 생성하고 이 과정을 반복적으로 수행한다. 영역의 평균 변이값이 기준 값보다 크면 이를 건물 지붕 영역으로 결정한다. IKONOS 위성영상에 제안한 방법을 적용하여 작은 건물이 밀집되어 있는 도시 지역에서 건물 지붕의 영역과 경계선을 효과적으로 검출할 수 있었다.

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Determination of Stress Intensity Factors for Bimaterial Interface Rigid Line Inclusions by Boundary Element Method (경계요소법을 이용한 접합재료 경계면의 직선균열형상의 강체 함유물에 대한 응력세기계수 결정)

  • Lee, Kang-Yong;Kwak, Sung-Gyu
    • Proceedings of the KSME Conference
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    • 2000.04a
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    • pp.176-181
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    • 2000
  • Stress intensity factors for a rigid line inclusion tying along a bimaterial interface are calculated by the boundary element method with the multiregion and double-Point techniques. The formula between the stress intensity factors and the inclusion surface stresses are derived. The numerical values of the stress intensity factors for the bimaterial interface rigid line inclusion in the infinite body are proved to be in good agreement within 3% when compared with the previous exact solutions. In the finite bimaterial systems, the stress intensity factors for the center and edge rigid line inclusions at interface are computed with the variation of the rigid line inclusion length and the shear modulus ratio under the biaxial and uniaxial loading conditions.

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Medical Image Data Compression Based on the Region Segmentation (영역분할을 기반으로 한 의료영상 데이타 압축)

  • 김진태;두경수
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.3
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    • pp.597-605
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    • 1999
  • In this paper, we propose a cardioangiography sequence image coding scheme which use a subtraction between initial image and current frame inserted contrast dye. Stable regions are obtained by the multithreshold and meaningful region is extracted by the images with stable region. The image with meaningful region is classified into contour and texture information. Contour information is coded by contour coding. And texture information is approximated by two-dimensional polynomial function and each coefficients is coded. Experimental results confirm that the sequence of cardioangiography are well reconstructed at the low bit rate (0.02∼0.04 bpp) and high compression ratio.

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Multi-scale Image Segmentation Using MSER and its Application (MSER을 이용한 다중 스케일 영상 분할과 응용)

  • Lee, Jin-Seon;Oh, Il-Seok
    • The Journal of the Korea Contents Association
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    • v.14 no.3
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    • pp.11-21
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    • 2014
  • Multi-scale image segmentation is important in many applications such as image stylization and medical diagnosis. This paper proposes a novel segmentation algorithm based on MSER(maximally stable extremal region) which captures multi-scale structure and is stable and efficient. The algorithm collects MSERs and then partitions the image plane by redrawing MSERs in specific order. To denoise and smooth the region boundaries, hierarchical morphological operations are developed. To illustrate effectiveness of the algorithm's multi-scale structure, effects of various types of LOD control are shown for image stylization. The proposed technique achieves this without time-consuming multi-level Gaussian smoothing. The comparisons of segmentation quality and timing efficiency with mean shift-based Edison system are presented.