CAJ | 학술논문

针对国标 GB ／T17444－2013中对红外焦平面阵列（Infrared Focal Arrays，IRFPA）固定图形噪声定义不能直接反映成像画面质量的问题，指出 IRFPA 在实际成像时要先经过非均匀性校正，校正残留才是影响成像质量的主要因素。本文先介绍了典型的两点校正方法，基于典型两点校正提出随环境温度实时更新的两点校正公式。通过对校正后的探测器输出通过时域滤波和小波变换分离出了固定图形噪声（FPN），给出了 FPN 的测试和计算方法。讨论了如何选择定标温度点来计算增益校正系数使得 FPN 值在指定的温度范围最小。通过对比4个增益校正阵列各个温度点下的 FPN 曲线，并结合同一参考目标的成像画面，验证了本文提出的FPN 值能够准确反应成像画面质量。
침대국표 GB ／T17444－2013중대홍외초평면진렬（Infrared Focal Arrays，IRFPA）고정도형조성정의불능직접반영성상화면질량적문제，지출 IRFPA 재실제성상시요선경과비균균성교정，교정잔류재시영향성상질량적주요인소。본문선개소료전형적량점교정방법，기우전형량점교정제출수배경온도실시경신적량점교정공식。통과대교정후적탐측기수출통과시역려파화소파변환분리출료고정도형조성（FPN），급출료 FPN 적측시화계산방법。토론료여하선택정표온도점래계산증익교정계수사득 FPN 치재지정적온도범위최소。통과대비4개증익교정진렬각개온도점하적 FPN 곡선，병결합동일삼고목표적성상화면，험증료본문제출적FPN 치능구준학반응성상화면질량。
As the definition of fixed pattern noise (FPN)in the national standard GB/T1 7444 -201 3 can′t evaluate imaging quality of infrared image,it is proposed that the residue after non -uniformity correction (NUC)is the main factor for the imaging quality.A novel NUC method which adapts with the ambient temperature was introduced and compared with the typical two -point correction.The FPN were separated through the temporal filtering and wavelet transform of the signal voltage after the correction.The measurement and calculating method of FPN were given.An experiment was carried out to determine how to select the calibration temperature to minimize the FPN in a specified temperature range.Then four images obtained from 4 different gain correction coefficients matrix of the same target were compared.The comparison results prove the consistency between the image quality and the FPN curves,which verifies that the new definition of FPN can accurately evaluate the imaging quality.