CAJ | 학술논문

在数字全息成像自动对焦算法实现中引入适用的导数计算方法,形成了4种基于导数的对焦判据函数.通过分析在相移数字全息中记录全息图时引入的噪声在提取物光波复振幅过程中的传递,研究了噪声对基于导数的自动对焦算法的影响,给出了不同算法的综合评价.数值仿真和光学实验处理结果表明,Prewitt梯度判据函数(PRG),Tenebaum梯度判据函数(TEG)与角谱再现算法结合可以形成快速可靠的自动对焦算法.
재수자전식성상자동대초산법실현중인입괄용적도수계산방법,형성료4충기우도수적대초판거함수.통과분석재상이수자전식중기록전식도시인입적조성재제취물광파복진폭과정중적전체,연구료조성대기우도수적자동대초산법적영향,급출료불동산법적종합평개.수치방진화광학실험처리결과표명,Prewitt제도판거함수(PRG),Tenebaum제도판거함수(TEG)여각보재현산법결합가이형성쾌속가고적자동대초산법.
Four derivatives-based autofocus criteria functions are proposed through bringing several applicable computational methods of derivatives into the study of autofocus algorithms for the digital holographic imaging. By analyzing the transfer of noise produced during recording in phase shifting digital holography, the impact of noise on the derivatives-based autofocus algorithms is investigated. The results from the simulation and experiment indicate Prewitt gradient (PRG) and Tenebaum gradient (TEG) criteria functions, together with the angular spectrum reconstruction routine can form two types of efficient and reliable autofocus algorithms.