Rai Mani R, Vijayakumar A, Rosen Joseph
Opt Express. 2018 Jul 9;26(14):18143-18154. doi: 10.1364/OE.26.018143.
Interferenceless coded aperture correlation holography (I-COACH) is an incoherent digital holography technique for imaging 3D objects without two-wave interference. In I-COACH, the object beam is modulated by a pseudorandom coded phase mask (CPM) and propagates to the camera where its intensity pattern is recorded. The image of the object is reconstructed by a cross-correlation of the object intensity pattern with a point intensity response of the system, whereas the light from both the object and the point, are modulated by the same CPM. In order to recover the image of the object without bias level and background noise, multiple intensity recordings are necessary for both objects as well as the point object, which in turn significantly reduces the time resolution of imaging. In this study, a non-linear reconstruction technique is developed to reconstruct the image of the object with only a single camera shot. Furthermore, the proposed technique is adaptive to different experimental conditions in the sense of finding different optimal parameters for each experiment. The new method has been implemented on a regular I-COACH system in both transmission as well as reflection illumination modes.
无干涉编码孔径相关全息术（I-COACH）是一种非相干数字全息技术，用于对三维物体进行成像，无需双波干涉。在I-COACH中，物光束由伪随机编码相位掩模（CPM）调制，并传播到相机，在相机处记录其强度图案。通过将物体强度图案与系统的点强度响应进行互相关来重建物体图像，而来自物体和点的光都由相同的CPM调制。为了无偏置水平和背景噪声地恢复物体图像，需要对物体以及点物体进行多次强度记录，这反过来又显著降低了成像的时间分辨率。在本研究中，开发了一种非线性重建技术，仅通过一次相机拍摄就能重建物体图像。此外，所提出的技术在为每个实验找到不同最优参数的意义上适应不同的实验条件。该新方法已在常规的I-COACH系统上以透射和反射照明模式实现。
