由空間頻域上的非均勻采樣數(shù)據(jù)重建圖象的方法研究
STUDY ON THE METHOD OF RECONSTRUCTING IMAGE FROM THE UNEVENLY SPACED DATA IN THE SPATIAL FREQUENCY DOMAIN
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摘要: 本文深入研究了由空間頻域上的非均勻采樣數(shù)據(jù)重建圖象的雙線性插值加二維快速傅里葉反變換方法。它的基本思想是首先確定一個(gè)均勻的柵網(wǎng),然后應(yīng)用雙線性插值將給定的非均勻采樣數(shù)據(jù)插到這一柵網(wǎng)的各個(gè)結(jié)點(diǎn)上,再對結(jié)點(diǎn)上的數(shù)據(jù)應(yīng)用二維快速傅里葉反變換。本文提出了確定柵網(wǎng)的原則,討論了雙線性插值,并分析了關(guān)于二維快速傅里葉反變換的一些重要問題。將這種方法應(yīng)用于合成孔徑雷達(dá)(SAR)的成象處理中,得到了滿意的結(jié)果。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 圖象重建; 雙線性插值; 二維快速傅里葉反變換
Abstract: This paper studies intensively the bilinear interpolation and 2D-IFFT method of reconstructing image from the unevenly spaced data in the spatial frequency domain. The basic ideas are to decide an evenly grid, interpolate the unevenly spaced data on a uniform grid and take the 2D-IFFT of the data on the uniform grid. The paper presents the principle of deciding the grid, discusses bilinear interpolation and analyses some important problems of 2D-IFFT. The method has been applied to synthetic aperture radar(SAR) imaging and the result is satisfactory. -
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