【摘要】 研究了一种采用随机相位板消除光学像差的波前编码和数字图像处理混合成像方法。用激光散斑干涉法制作随机相位板,放置在系统成像面之前的光路中,光学像差图像被转变为随机编码中间像,使光学系统固定像差淹没在随机编码中受到削弱。建立了基于频域梯度优化的盲反卷积解码算法,用于解码中间像为无像差图像,由于采用频域共轭梯度优化,提高了解码图像速度。分析了对称像差、非对称像差和混合像差等情况对编码成像质量的影响,并显示了编码成像抑制噪声的能力。进行了计算机模拟和实验室实验,结果表明,所提出方法具有有效消除像差和抑制噪声的能力,改善光学系统成像质量,使成像系统分辨率达到光学衍射极限水平。更多还原

【Abstract】 A hybrid imaging was investigated to remove the optical aberrations by random wave front coding and digital image processing.The random phase mask made of laser speckle interference was placed in light path before the optical system image detector to change aberration image into random encoding intermediate image,and the optical deterministic aberrations was submerged in random encoding,so weakened.The blind deconvolution decoding algorithm based on frequency-domain conjugate gradient optimization was established for decoding intermediate image into no aberrations image.Due to using the frequency domain gradient optimization,the decoded image speed is improved.The influence of symmetrical,asymmetric and mixed aberrations,etc on encoding imaging was analyzed.Also the ability of noise inhibiting of encoding imaging is shown.The computer simulation and laboratory experiment were done,the results show that the proposed method can effectively eliminate optical system aberrations,reduce the noise,improve the imaging quality,and have resolution of optical system reach the diffraction limited level.更多还原