Noise suppression by controlling the sparsity of the point spread function in interferenceless coded aperture correlation holography (I-COACH)

Ratnam, Mani Maran; Rosen, Joseph

doi:10.1364/oe.27.024311

Cited by 69 publications

(61 citation statements)

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“…The product of visibility and SNR values are considered as the www.nature.com/scientificreports www.nature.com/scientificreports/ figure of merit, and the combination of scattering degree and sparsity that gives the highest value was chosen as the optimal pair for resolution enhancement. The gain in power efficiency and SNR enable us to implement multiplane imaging by multiplexing two CPMs in a checkerboard arrangement 27 and enable us to image objects in a reflective mode.…”

Section: Discussionmentioning

confidence: 99%

“…As mentioned above, the phase mask used in the SRI-CAOCH is the combination of the CPM and DL. The CPM is computed using a modified GSA 27,29 , whereas the DL with the refractive lens L 1 are used to satisfy the Fourier relation between the CPM and the camera plane. The Fourier relation between the CPM and the camera plane is guaranteed if the imaging condition between the point object and the camera plane is fulfilled 4 .…”

Section: Synthesis Of the Phase Maskmentioning

confidence: 99%

“…As shown in Fig. 8, the iterative GSA algorithm 27,29 is initialized with a random phase and a uniform amplitude on the CPM plane. The complex valued CPM is then Fourier transformed to the Fourier (camera) plane and the amplitude of the transformed CPM is replaced by the predefined randomly distributed dots distributed over a predefined area on the camera plane.…”

Section: Synthesis Of the Phase Maskmentioning

confidence: 99%

“…Another recent development in this field of incoherent digital holography is the sparse I-COACH (SI-COACH) 27 . In SI-COACH the CPM is engineered such that the PSH is ensemble of dots sparsely distributed over the hologram plane.…”

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confidence: 99%

“…The reconstruction results for the different values of the scattering degree and the dot number was analyzed by visibility and SNR values 27 . For the SNR calculation, the noise was calculated by averaging the background around the reconstructed object, whereas the signal was calculated by averaging over the reconstructed object.…”

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Resolution-enhanced imaging using interferenceless coded aperture correlation holography with sparse point response

Ratnam

Rosen

2020

Sci Rep

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interferenceless coded aperture correlation holography (i-coAcH) is a non-scanning, motionless, incoherent digital holography technique. in this study we use a special type of i-coAcH in which its point spread hologram (pSH) is ensemble of sparse dots. With this pSH an imaging resolution beyond the classic diffraction limit is demonstrated. This resolution improvement is achieved due to the position of the coded aperture between the object and the lens-based imaging system. the coded aperture scatters part of the light, that otherwise is blocked by the system aperture, into the optical system, and by doing that, extends the effective numerical aperture of the system. The use of sparse PSH increases the signal-to-noise ratio of the entire imaging system. A lateral resolution enhancement by a factor of about 1.6 was noted in the case of I-COACH compared to direct imaging.

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Section: Discussionmentioning

confidence: 99%

Section: Synthesis Of the Phase Maskmentioning

confidence: 99%

Section: Synthesis Of the Phase Maskmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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