测绘与空间地理信息
測繪與空間地理信息
측회여공간지리신식
GEOMATICS & SPATIAL INFORMATION TECHNOLOGY
2015年
6期
13-14,31
,共3页
小波变换%伪不变特征%相对辐射校正%ASTER遥感图像
小波變換%偽不變特徵%相對輻射校正%ASTER遙感圖像
소파변환%위불변특정%상대복사교정%ASTER요감도상
wavelet transform%pseudo-invariant features%relative radiometric normalization%ASTER remote sensing image
采用小波分析将ASTER图像的低频分量和高频分量进行分离；对低频分量差值计算得到伪不变特征点，采用最小二乘法对低频分量进行线性变换；然后将原始待校正图像的高频分量与校正后的低频分量进行图像重构，实现多时相ASTER遥感图像的相对辐射校正。结果表明，该方法有效地保留了源图像中由于地物变化引起的辐射差异，相对辐射校正的整体效果较好。
採用小波分析將ASTER圖像的低頻分量和高頻分量進行分離；對低頻分量差值計算得到偽不變特徵點，採用最小二乘法對低頻分量進行線性變換；然後將原始待校正圖像的高頻分量與校正後的低頻分量進行圖像重構，實現多時相ASTER遙感圖像的相對輻射校正。結果錶明，該方法有效地保留瞭源圖像中由于地物變化引起的輻射差異，相對輻射校正的整體效果較好。
채용소파분석장ASTER도상적저빈분량화고빈분량진행분리；대저빈분량차치계산득도위불변특정점，채용최소이승법대저빈분량진행선성변환；연후장원시대교정도상적고빈분량여교정후적저빈분량진행도상중구，실현다시상ASTER요감도상적상대복사교정。결과표명，해방법유효지보류료원도상중유우지물변화인기적복사차이，상대복사교정적정체효과교호。
The ASTER images were decomposed into low -frequency components and high -frequency components by wavelet trans-form.Then, the PIF points were selected by the difference between the low -frequency components of the two images , and the linear transformation of low-frequency component was calculated using the least squares method .The high-frequency components discor-rected original image and low -frequency components corrected were reconstracted , in order to achieve the relative radiometric correc-tion of ASTER remote sensing images of different time periods .The results show that the method can save the radiation difference caused by the change of surface features themselves in the original image .The overall effect of relative radiometric correction is better .
