• 제목/요약/키워드: spatial images

검색결과 2,484건 처리시간 0.025초

원격탐사의 동향과 고해상도 위성영상의 활용 (The Trends in Remote Sensing and the Applications of High Resolution Space Images)

  • 여화수;박경환;박병욱
    • Spatial Information Research
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    • 제5권1호
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    • pp.89-98
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    • 1997
  • 원격탐사는 1972년이래 꾸준히 발전을 거듭해와 오늘날 고해상도의 위성영상을 수집하는 단계에까지 이르렀다. 고해상도 위성영상은 1m 이하의 공간 해상력을 갖는 영상으로 98년도부터 본격적인 공급이 시작될 것이며, 이것은 지도제작 분야를 비롯하여 측량, 정부 또는 자치단체, 가스/전력회사, 수자원 관리, 통신, 농업 등 여러 분야에서 다양하게 활용될 것이다. 특히 지도제작 분야에 있어서는 고해상도 위성영상을 이용하므로서 기존의 항공사진을 이용하는 지도제작 방법을 혁명적으로 바꾸게 될 것이다. 따라서 본고에서는 이러한 최신기술의 동향과 그 기술의 활용방안에 대하여 검토하고자 하였다.

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Atmospheric Correction Problems with Multi-Temporal High Spatial Resolution Images from Different Satellite Sensors

  • Lee, Hwa-Seon;Lee, Kyu-Sung
    • 대한원격탐사학회지
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    • 제31권4호
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    • pp.321-330
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    • 2015
  • Atmospheric correction is an essential part in time-series analysis on biophysical parameters of surface features. In this study, we tried to examine possible problems in atmospheric correction of multitemporal High Spatial Resolution (HSR) images obtained from two different sensor systems. Three KOMPSAT-2 and two IKONOS-2 multispectral images were used. Three atmospheric correction methods were applied to derive surface reflectance: (1) Radiative Transfer (RT) - based absolute atmospheric correction method, (2) the Dark Object Subtraction (DOS) method, and (3) the Cosine Of the Uun zeniTh angle (COST) method. Atmospheric correction results were evaluated by comparing spectral reflectance values extracted from invariant targets and vegetation cover types. In overall, multi-temporal reflectance from five images obtained from January to December did not show consistent pattern in invariant targets and did not follow a typical profile of vegetation growth in forests and rice field. The multi-temporal reflectance values were different by sensor type and atmospheric correction methods. The inconsistent atmospheric correction results from these multi-temporal HSR images may be explained by several factors including unstable radiometric calibration coefficients for each sensor and wide range of sun and sensor geometry with the off-nadir viewing HSR images.

Generalized IHS-Based Satellite Imagery Fusion Using Spectral Response Functions

  • Kim, Yong-Hyun;Eo, Yang-Dam;Kim, Youn-Soo;Kim, Yong-Il
    • ETRI Journal
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    • 제33권4호
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    • pp.497-505
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    • 2011
  • Image fusion is a technical method to integrate the spatial details of the high-resolution panchromatic (HRP) image and the spectral information of low-resolution multispectral (LRM) images to produce high-resolution multispectral images. The most important point in image fusion is enhancing the spatial details of the HRP image and simultaneously maintaining the spectral information of the LRM images. This implies that the physical characteristics of a satellite sensor should be considered in the fusion process. Also, to fuse massive satellite images, the fusion method should have low computation costs. In this paper, we propose a fast and efficient satellite image fusion method. The proposed method uses the spectral response functions of a satellite sensor; thus, it rationally reflects the physical characteristics of the satellite sensor to the fused image. As a result, the proposed method provides high-quality fused images in terms of spectral and spatial evaluations. The experimental results of IKONOS images indicate that the proposed method outperforms the intensity-hue-saturation and wavelet-based methods.

Hyperion과 ALI 영상의 융합을 위한 블록 기반의 융합기법 평가 (Evaluation of Block-based Sharpening Algorithms for Fusion of Hyperion and ALI Imagery)

  • 김예지;최재완
    • 한국측량학회지
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    • 제33권1호
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    • pp.63-70
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    • 2015
  • 영상융합 기법은 고해상도 영상을 이용하여 저해상도 영상의 공간해상도를 증대시키는 방법이다. 본 논문에서는 EO-1 위성에 탑재된 ALI 센서와 Hyperion 센서로부터 취득된 고해상도 흑백영상, 저해상도 다중분광 영상 및 초분광 영상을 활용한 초분광 영상의 융합기법에 대한 연구를 수행하였다. 특히, 초분광 영상과 다중분광 영상의 특성을 고려하여 초분광 영상의 블록을 구성하여 ALI 및 Hyperion 영상에 적용하고, 이에 따른 영상융합 기법의 성능을 평가하고자 하였다. 실험결과, 고해상도 흑백영상만을 사용한 융합결과와 비교하여 저해상도 다중분광 영상을 활용한 블록기반의 융합기법이 공간해상도를 효율적으로 향상시킬 수 있음을 확인하였으며, 제안된 융합기법이 기존의 블록기반 융합기법과 비교하여 분광왜곡을 최소화시킬 수 있음을 확인하였다. 이를 통해, 향후 발사될 다양한 초분광 위성 및 항공기 초분광 센서의 활용을 증대시킬 수 있을 것으로 판단된다.

A Study on Super Resolution Image Reconstruction for Effective Spatial Identification

  • Park Jae-Min;Jung Jae-Seung;Kim Byung-Guk
    • Spatial Information Research
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    • 제13권4호
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    • pp.345-354
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    • 2005
  • 초해상도 영상복원은 동일 지역을 촬영한 여러 장의 저해상도 영상을 이용하여 고해상도의 영상으로 재구성하는 영상처리 알고리즘 기법이다. 이 기법은 위성영상, 비디오 감시, 영상 강조 및 복원, 영상 모자이킹, 의료 영상과 같이 여러 장의 프레임 영상을 획득할 수 있는 분야에서 유용하게 사용될 수 있다. 본 연구에서는 지상을 촬영한 비디오 영상 열에 공간영역 초해상도 기법을 적용하였다. 실험에 사용된 영상은 높은 중복도로 촬영된 연속적인 비디오 영상에서 부표본화되었으며, 저해상도 영상과 고해상도 영상간의 관측 모델을 구성하고 초해상도 영상복원 기법중의 하나인 MAP 알고리즘을 적용하였다. MAP 기법을 이용하여 여러 장의 저해상도 영상에서 고해상도 영상으로 복원하였으며, 그 결과를 기존의 영상보간 방법들과 비교하였다.

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공간 마스킹 효과를 적용한 이진트리 벡터양자화 (Binary Tree Vector Quantization Using Spatial Masking Effect)

  • 유성필;곽내정;윤태승;안재형
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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    • pp.369-372
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    • 2003
  • In this paper, we propose impr oved binary tree vector quantization based on spatial sensitivity which is one of the human visual properties. We combine the weights based on spatial masking effect according to changes of three primary colors in blocks of images with the process of splitting nodes using eigenvector in binary tree vector quantization. The test results show that the proposed method generates the quantized images with fine color and performs better than the conventional method in terms of clustering the similar regions. Also the proposed method can get the better result in subjective qualify test and PSNR.

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Introduction of Integrated Management of Satellite Imagery Information

  • Chae, Gee-Ju;Yoon, Geun-Won;Hwang, Tae-Hyun;Park, Jong-Hyun
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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    • pp.197-201
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    • 2002
  • The high prices of satellite images prevent researchers from studying remote sensing and most non-professional people doesn't have the simple and easy solutions for the manipulation of satellite images. "Integrated Management of Satellite Imagery Information" project which will be promoted by ETRI (Electronics and Telecommunications Research Institute) will provide the solutions for the above mentioned problems. We will introduce the archiving center in this study. This includes the data construction, storage, management and distribution. We first review the background for this archiving center and introduce the interior and foreign institutes which archive and distribute satellite images. We review our H/W system and S/W system briefly. Finally, the further service of our project will be suggested. Since we will distribute the satellite images (Landsat, SPOT, JERS, Corona, Kompast-1) and will receive Landsat7 ETM+ in 2003 you, this will help the professional work dealing with the satellite image and attract the non-professional people for simple and easy manipulation solutions of satellite image.

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공간정보와 색상변화율을 이용한 영상검색 (Image Retrieval using Spatial Information and Color Changing Ratio)

  • 강기현;박유신;윤용인;최종수;김동욱
    • 한국멀티미디어학회논문지
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    • 제11권1호
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    • pp.23-33
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    • 2008
  • 본 논문에서는 공간정보와 색상변화율을 이용한 영상검색방법을 제안한다. 제안된 방법은 공간정보를 추출하기 위하여 임계치 $\tau$에 의하여 영상으로부터 색상영역들을 추출한다. 이 과정에서 색상 영역의 수와 색상변화 횟수를 계산하며, 이 값들을 이용하여 색상변화율을 얻는다. 영상간의 유사도는 공간정보에 의해여 측정되며, 색상변화율은 유사한 색상변화율을 가진 이미지가 보다 높은 검색 순위가 갖도록 돕는다. 다양한 자연영상들을 이용한 실험을 통하여 제안된 방법이 색상정보를 이용한 다른 일반적인 방법들보다 뛰어난 성능을 보임을 확인하였다.

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항공사진과 레이져 데이터의 통합에 의한 3 차원 공간정보 활용기술연구 (A Study on the Application Technique of 3-D Spatial Information by integration of Aerial photos and Laser data)

  • 연상호
    • 한국측량학회지
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    • 제28권3호
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    • pp.385-392
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    • 2010
  • A LiDAR technique has the merits that survey engineers can get a large number of measurements with high precision quickly. Aerial photos and satellite sensor images are used for generating 3D spatial images which are matched with the map coordinates and elevation data from digital topographic files. Also, those images are used for matching with 3D spatial image contents through perspective view condition composed along to the designated roads until arrival the corresponding location. Recently, 3D aviation image could be generated by various digital data. The advanced geographical methods for guidance of the destination road are experimented under the GIS environments. More information and access designated are guided by the multimedia contents on internet or from the public tour information desk using the simulation images. The height data based on LiDAR is transformed into DEM, and the real time unification of the vector via digital image mapping and raster via extract evaluation are transformed to trace the generated model of 3-dimensional downtown building along to the long distance for 3D tract model generation.

Development of Dataset Items for Commercial Space Design Applying AI

  • Jung Hwa SEO;Segeun CHUN;Ki-Pyeong, KIM
    • 한국인공지능학회지
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    • 제11권1호
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    • pp.25-29
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    • 2023
  • In this paper, the purpose is to create a standard of AI training dataset type for commercial space design. As the market size of the field of space design continues to increase and the time spent increases indoors after COVID-19, interest in space is expanding throughout society. In addition, more and more consumers are getting used to the digital environment. Therefore, If you identify trends and preemptively propose the atmosphere and specifications that customers require quickly and easily, you can increase customer trust and conduct effective sales. As for the data set type, commercial districts were divided into a total of 8 categories, and images that could be processed were derived by refining 4,009,30MB JPG format images collected through web crawling. Then, by performing bounding and labeling operations, we developed a 'Dataset for AI Training' of 3,356 commercial space image data in CSV format with a size of 2.08MB. Through this study, elements of spatial images such as place type, space classification, and furniture can be extracted and used when developing AI algorithms, and it is expected that images requested by clients can be easily and quickly collected through spatial image input information.