本文選題：成像系統(tǒng)　切入點(diǎn)：非均勻性校正　出處：《光學(xué)學(xué)報(bào)》2017年11期

【摘要】：針對(duì)時(shí)間延遲積分(TDI)電荷耦合器件(CCD)成像系統(tǒng)多通道間存在響應(yīng)非均勻問題,開展了基于輻射定標(biāo)的校正方法研究。結(jié)合成像系統(tǒng)的信號(hào)處理流程,推導(dǎo)了響應(yīng)非均勻性校正的理論模型,提出了一種基于加權(quán)最小二乘的定標(biāo)校正方法,分別在1/4、1/2和3/4飽和響應(yīng)處采集三組圖像數(shù)據(jù),并利用高斯加權(quán)函數(shù)對(duì)三組通道間的校正參數(shù)進(jìn)行加權(quán)最小二乘擬合,從而獲得優(yōu)化的校正參數(shù)。利用TDI CCD成像系統(tǒng)進(jìn)行實(shí)驗(yàn)驗(yàn)證,結(jié)果表明,系統(tǒng)的響應(yīng)非均勻性(1/2飽和響應(yīng)處)由原來的4.09%降低至0.85%,并優(yōu)于兩點(diǎn)校正法的1.93%,同時(shí)該方法在寬響應(yīng)域內(nèi)均獲得了良好的校正效果,具有精度高、實(shí)用性強(qiáng)等特點(diǎn),可應(yīng)用于機(jī)載、星載等相機(jī)載荷,為獲取高質(zhì)量的遙感圖像數(shù)據(jù)奠定技術(shù)基礎(chǔ)。
[Abstract]:In order to solve the problem of nonuniform response between multiple channels of time delay integral TDI (TDI) charge-coupled device (CCD) imaging system, the correction method based on radiometric calibration is studied, which is combined with the signal processing flow of the imaging system. A theoretical model of response nonuniformity correction is derived, and a calibration method based on weighted least squares is proposed, in which three sets of image data are collected at 1 / 4 / 1 / 2 and 3 / 4 saturation response, respectively. The optimized correction parameters are obtained by using Gao Si weighting function to fit the correction parameters between the three groups of channels by weighted least squares. The experimental results of TDI CCD imaging system show that, The response nonuniformity of the system is reduced from 4.09% to 0.85%, which is better than that of the two-point correction method (1.93%). At the same time, the method has good correction effect in wide response domain, and has the characteristics of high accuracy and strong practicability. It can be applied to airborne, spaceborne and other camera payloads, which lays a technical foundation for obtaining high quality remote sensing image data.
【作者單位】： 中國(guó)科學(xué)院長(zhǎng)春光學(xué)精密機(jī)械與物理研究所;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家973計(jì)劃(2016YFB0501202)
【分類號(hào)】：TN386.5

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