典型相關分析應用於衛星遙測影像變遷偵測之研究

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姓名

吳孟宸(Mon-Chen Wu) 查詢紙本館藏

畢業系所

太空科學研究所

論文名稱

典型相關分析應用於衛星遙測影像變遷偵測之研究
(Canonical Correlations Analysis Apply to Change Detection in Remote Sensing Image)

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摘要(中)

摘要
本研究中主要使用雷達影像來進行變遷偵測，利用合成孔徑雷達衛星的全天候不受天氣影響及多偏極的特性，在每個偏極方向都包含了資訊，為了將全部偏極的資訊結合起來，便將影像做主軸的轉換。傳統主軸轉換是使用差值影像的共變異矩陣所進行的主成分分析。本研究以典型相關分析(Canonical Correlations Analysis)為基礎，反演為多變數轉化偵測法(Multivariate Alteration Detection)，而此方法的特色在於此轉換方法具有線性轉換的不變性，即使兩時期影像因時間的不同有不同的背景輻射強度，或因儀器本身的補償(offsets)與增益(gain)這些線性關係的影響，也不需要作絕對的校正前處理。再以轉換後影像，利用卡方統計檢定法，判斷變遷區域，使變遷偵測的結果能更加接近實際的變遷。
研究中利用多變數轉化偵測法(Multivariate Alteration Detection)，來觀察以人為改變後期影像部分區塊後的模擬結果，最後再利用ENVISAT及STOP兩組衛星影像來做變遷測試，而測試結果可以利用典型變數來觀察與原始影像每個波段或每個偏極方向的關係。

摘要(英)

Abstract
SAR image is becoming more important data source for change detection, because of its advantages of all-weather、day-and-night operations and providing multi-polarization information. To perform change detection, linear transformations of the image data is usually adopted, for example, most commonly, by principal component analysis. In this study, we used the multivariate alteration detection (MAD) to perform the transformation of the two image sets. One of advantages of the multivariate alteration detection (MAD) transformation is its the linear scale invariance. This means that it is not sensitive to the offsets or gain settings of a measuring device, or to radiometric and atmospheric correction schemes that show a linear relationship with brightness counts. The change, after MAD transformation, was carried out by Chi-Square test. To verify and validate the procedure, we first used simulation images at different time and artificially making land cover changes at different polarizations. Finally, the method was test on real images from SPOT and ENVISAT multi-polarization data. The relationship between each band or polarization was investigated from canonical variates. The detection accuracy was found to be satisfactory.

關鍵字(中)

★ 典型相關分析
★ 多變數轉化偵測法
★ 卡方檢定

關鍵字(英)

★ Chi-square Test
★ Canonical Correlations Analysis
★ Multivariate Alteration Detection

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 V
表目錄 IX
第1章緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1 影像相減法 2
1.2.2 影像比例法 3
1.2.3 分類後比較法 4
1.2.4 主軸轉換分析法 5
1.3 研究目的及方法 7
第2章變遷偵測方法 8
2.1 典型相關分析 9
2.2 多變數轉化偵測法 13
2.3 線性轉換不變性之證明 16
2.4 卡方檢定法 18
第3章模擬影像測試 22
3.1 多變數轉化偵測法之抗雜訊檢定 22
3.1.1 衛星模擬影像資料 23
3.1.2 模擬影像之多變數轉化偵測法成果 38
3.1.3 模擬影像之變遷區域偵測成果 48
第4章衛星影像測試 62
4.1 衛星測試影像資料 62
4.2 衛星測試影像之多變數轉化偵測法成果70
4.3 衛星測試影像之變遷區域偵測成果 76
4.4 多變數轉化偵測法之成分結構分析 80
第5章結論與展望 84
5.1 結論 84
5.2 展望 85
參考文獻 86

參考文獻

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指導教授

陳錕山(Kun-Shan Chen)

審核日期

2006-7-22

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