Abstract
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.
Highlights
Digital holography has several advantages over direct imaging such as 3D imaging capability with minimum camera shots, and the ability to improve imaging qualities by intermediate signal processing ability [1]
We introduce an adaptive computational reconstruction technique called non-linear reconstruction (NLR) for reconstructing the image only by one camera shot of a single intensity pattern
An adaptive digital reconstruction technique termed NLR has been developed for reconstruction of 3D images with a single camera shot of the Interferenceless coded aperture correlation holography (I-coded aperture correlation holography (COACH)) system
Summary
Digital holography has several advantages over direct imaging such as 3D imaging capability with minimum camera shots, and the ability to improve imaging qualities by intermediate signal processing ability [1]. In most of the digital holography techniques, multiple intensity recordings are necessary in order to recover the 3D image of the object without twin image and bias terms [1]. Fresnel incoherent correlation holography (FINCH), a well-known incoherent digital holography technique requires at least three intensity recordings to remove the twin image and the bias terms [2,3]. Fourier incoherent holography technique published in 2012 [4] has the single shot capability but has a relatively complex optical configuration compared to FINCH. A modified ICOACH technique called single camera shot I-COACH (SCS-I-COACH) was developed for improved background noise suppression [14]. We introduce an adaptive computational reconstruction technique called non-linear reconstruction (NLR) for reconstructing the image only by one camera shot of a single intensity pattern. Experiments with different conditions to evaluate the performances of the NLR are described, followed by the conclusion in the last section
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