• Title, Summary, Keyword: SAR-SIFT

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Registration Method between High Resolution Optical and SAR Images (고해상도 광학영상과 SAR 영상 간 정합 기법)

  • Jeon, Hyeongju;Kim, Yongil
    • Korean Journal of Remote Sensing
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    • v.34 no.5
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    • pp.739-747
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    • 2018
  • Integration analysis of multi-sensor satellite images is becoming increasingly important. The first step in integration analysis is image registration between multi-sensor. SIFT (Scale Invariant Feature Transform) is a representative image registration method. However, optical image and SAR (Synthetic Aperture Radar) images are different from sensor attitude and radiation characteristics during acquisition, making it difficult to apply the conventional method, such as SIFT, because the radiometric characteristics between images are nonlinear. To overcome this limitation, we proposed a modified method that combines the SAR-SIFT method and shape descriptor vector DLSS(Dense Local Self-Similarity). We conducted an experiment using two pairs of Cosmo-SkyMed and KOMPSAT-2 images collected over Daejeon, Korea, an area with a high density of buildings. The proposed method extracted the correct matching points when compared to conventional methods, such as SIFT and SAR-SIFT. The method also gave quantitatively reasonable results for RMSE of 1.66m and 2.45m over the two pairs of images.

Comparison of Image Matching Method for Automatic Matching of High Resolution SAR Imagery (SAR 영상 자동정합을 위한 영상정합기법의 비교연구)

  • Baek, Sang Ho;Hong, Seung Hwan;Yoo, Su Hong;Sohn, Hong Gyoo
    • Journal of The Korean Society of Civil Engineers
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    • v.34 no.5
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    • pp.1639-1644
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    • 2014
  • SAR satellite can acquire clear imagery regardless of weather and the images are widely used for land management, natural hazard monitoring and many other applications. Automatic image matching technique is necessary for management of a huge amount of SAR data. Nevertheless, it is difficult to assure the accuracy of image matching due to the difference of image-capturing attitude and time. In this paper, we compared performances of MI method, FMT method and SIFT method by applying arbitrary displacement and rotation to TerraSAR-X images and changing resolution of the images. As a result, when the features having specific intensity were distributed well in SAR imagery, MI method could assure 0~2 pixels accuracy even if the images were captured in different geometry. But the accuracy of FMT method was significantly poor for the images having different spatial resolutions and the error was represented by tens or hundreds pixels. Moreover, the ratio of corresponding matching points for SIFT method was only 0~17% and it was difficult for SIFT method to apply to SAR images captured in different geometry.

Augmented Reality Algorithm Selection Scheme for Military Multiple Image Analysis (국방용 다중 영상분석 증강현실 알고리즘 선택기술)

  • Yoo, Heouk-kyun;Chung, Jong-Moon
    • Journal of Internet Computing and Services
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    • v.20 no.4
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    • pp.55-61
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    • 2019
  • In this paper, if images are acquired in all-time situations through various sensors (EO/IR, SAR, GMTI, LiDAR) used for defense purposes, the images can be analyzed and expressed in augmented reality(AR). Various algorithms are used to process images with augmented reality, and depending on the situation, it is necessary to decide which algorithms to select and use. Through the performance comparison (error rate, processing time, accuracy) of SIFT, SURF, ORB, and BRISK, the representative augmented reality algorithm, it is analyzed and proposed which augmented reality algorithm is effective to use under various situations in the defense field.