Optimized Asymmetrical Arcsine Phase Mask for Extending the Depth of Field

Wang, Lei; Ye, Qing; Nie, Jinsong; Sun, Xueliang

doi:10.1109/lpt.2018.2845709

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…Recently, computational imaging has been widely applied in many fields. Wavefront coding imaging is one of the computational imaging technologies, which includes a phase mask in the pupil plane of the optical system; it can achieve high-quality imaging along with a wide range of defocus through digital processing [10][11][12] . Swartzlander et al used vortex and axicon phase masks in the pupil plane of the wavefront coding imaging system to modify the point spread function (PSF) of the optical system, thereby reducing the peak irradiance on the sensor [13,14] .…”

Section: Introductionmentioning

confidence: 99%

Experimental damage thresholds of a laser suppression imaging system using a cubic phase plate

Zhang

et al. 2023

中国光学快报

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The development of laser systems leads to an increasing threat to photoelectric imaging sensors. A cubic phase plate wavefront coding imaging system is proposed to reduce the risk of damage owing to intense laser radiation. Based on the wavefront coding imaging model, the diffracted spot profile and the light intensity distribution on the observation plane are simulated. An experimental device is set up to measure the laser-induced damage thresholds and investigate the morphology of laser-induced damage patterns of the conventional and the wavefront encoding imaging system. Simulations and experimental results manifest the superior laser suppression performance of the proposed method, which can help diminish the undesirable effects of laser irradiation on an imaging sensor.

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Section: Introductionmentioning

confidence: 99%

Experimental damage thresholds of a laser suppression imaging system using a cubic phase plate

Zhang

et al. 2023

中国光学快报

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“…On the one hand, researchers have been committed to studying various types of masks to eliminate the small differences in PSF or MTF as much as possible, such as with logarithmic phase plates, tangent phase plates, exponential phase plates, etc. [6,7]. However, it has been proved that the ability of a single phase plate is very limited, and it is difficult to achieve the target effect.…”

Section: Introductionmentioning

confidence: 99%

Extended Depth-of-Field Imaging Using Multi-Scale Convolutional Neural Network Wavefront Coding

Zhou,

Wu,

Guo

et al. 2023

Electronics

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Wavefront encoding (WFC) is a depth-of-field (DOF) extension technology that combines optical encoding and digital decoding. The system extends DOF at the expense of intermediate image quality and then decodes it through an image restoration algorithm to obtain a clear image. Affected by point spread differences, traditional decoding methods are often accompanied by artifacts and noise amplification problems. In this paper, based on lens-combined modulated wavefront coding (LM-WFC), we simulate the imaging process under different object distances, generate a simulation data set of WFC, and train a multi-scale convolutional neural network. The simulation experiment proves that this method can effectively reduce artifacts and improve image clarity. In addition, we used the LM-WFC camera to obtain real scene images with different target distances for experiments. The decoding results showed that the network model can enhance the quality of image restoration and generate clear images that are more in line with human vision, which is conducive to the improvement and practical application of wavefront coding systems.

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“…Recently, computational imaging has been widely applied in many fields. Wavefront coding imaging is one type of computational imaging technology, which can achieve quasi-real-time and high-quality imaging along with a wide range of defocus [14,15]. According to previous research [14,16], the cubic phase plate can extend the depth of field of the wavefront coding imaging.…”

Section: Introductionmentioning

confidence: 99%

A Retroreflection Reduction Technique Based on the Wavefront Coded Imaging System

et al. 2021

Crystals

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A novel anti-cat-eye effect imaging technique based on wavefront coding is proposed as a solution to the problem of previous anti-cat-eye effect imaging techniques where imaging quality was sacrificed to reduce the retroreflection from the photoelectric imaging equipment. With the application of the Fresnel–Kirchhoff diffraction theory, and the definition of generalized pupil function combining both phase modulation and defocus factors, the cat-eye echo formation of the wavefront coded imaging system is theoretically modeled. Based on the physical model, the diffracted spot profile distribution and the light intensity distribution on the observation plane are further simulated with the changes in the defocus parameter and the phase modulation coefficient. A verification test on the cat-eye laser echo power of the wavefront coded imaging system and that of the conventional imaging system at a 20 m distance are conducted, respectively. Simulations and experiment results show that compared with conventional imaging systems, the wavefront coding imaging system can reduce the retroreflection echo by two orders of magnitude while maintaining better imaging quality through defocusing.

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Optimized Asymmetrical Arcsine Phase Mask for Extending the Depth of Field

Cited by 9 publications

References 10 publications

Experimental damage thresholds of a laser suppression imaging system using a cubic phase plate

Experimental damage thresholds of a laser suppression imaging system using a cubic phase plate

Extended Depth-of-Field Imaging Using Multi-Scale Convolutional Neural Network Wavefront Coding

A Retroreflection Reduction Technique Based on the Wavefront Coded Imaging System

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