基于光场相机波前传感器的气动光学效应校正研究

受气动光学效应的影响,来自目标的光波波前会产生动态扰动,导致成像模糊化。常用的校正方法是在测得波前的前提下进行解卷积处理,达到还原图像的效果。传统的波前传感器只能有效测量中心视场,由于存在非等晕问题,导致所能还原的图像区域过小。光场相机波前传感器作为一种新型波前传感器,具有视场大、动态范围大的优点,可以同时探测模糊图像不同区域的点扩散函数,从而一次性还原整幅图像。文章利用Matlab模拟了光场相机的大视场波前探测特性,对气动光学效应引起的模糊图像进行清晰化处理,并与夏克-哈特曼传感器的模拟结果进行了比较。结果表明,光场相机波前传感器可以对气动光学效应造成的波前扰动进行有效的大视场波前探测,一次探测能够清晰化整个视场的图像,且视场范围是传统波前传感器的数倍以上。

Research on Aero-optic Effect Correction Based on Light-field Camera Wavefront Sensor

Affected by the aero-optical effect, the wavefront of the light wave from the target will cause dynamic disturbance, which will cause blurring in imaging. A common correction method is to perform deconvolution processing based on measuring the wavefront so as to restore the image. The traditional wavefront sensor can only measure the central field of view, thus the image area that can be restored is too small due to non-equal halo problems. As a new type of wavefront sensor, the light field camera wavefront sensor has the advantages of large field of view and large dynamic range. It can simultaneously detect the point spread functions of different areas of a blurred image, so as to restore the full image at one time. The large-field wavefront detection characteristics of the light-field camera were numerically simulated by using MATLAB software, and the blurred images caused by aero-optical effects were clearly processed, and compared with the simulation results of the Shack-Hartman sensor. The results show that the wavefront sensor of the light field camera can detect the wavefront disturbance caused by the pneumatic optical effect effectively and the image of the whole field of view can be clearly detected at one time, and the field of view is several times of that of the traditional wavefront sensor.