Phase plate to extend the depth of field of incoherent hybrid imaging systems

Sherif, Sherif S.; Cathey, W. Thomas; Dowski, Ed R.

doi:10.1364/ao.43.002709

Cited by 126 publications

(49 citation statements)

References 16 publications

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“…Other metrics for quantifying DOF exist, such as the Hilbert-space angle for varying depths [21] or the worstcase MTF [12]. The former is analytically intractable.…”

Section: Measuring Depth Invariancementioning

confidence: 99%

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Transfer efficiency and depth invariance in computational cameras

Baek

2010

2010 IEEE International Conference on Computational Photography (ICCP)

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“…Other metrics for quantifying DOF exist, such as the Hilbert-space angle for varying depths [21] or the worstcase MTF [12]. The former is analytically intractable.…”

Section: Measuring Depth Invariancementioning

confidence: 99%

“…In fact, many computational cameras rely on spatiotemporally modulating the aperture in order to extend the depth of field-such as phase coding [5,6,12,21], amplitude coding [11,15,18,22], and temporal coding [16]-though other approaches exist, notably stereo [20], the plenoptic camera [17], and multiple capture [8].…”

Section: Introductionmentioning

confidence: 99%

Transfer efficiency and depth invariance in computational cameras

Baek

2010

2010 IEEE International Conference on Computational Photography (ICCP)

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“…Several PMs have recently been proposed, and analysed, to produce DOF extension [10,11,12,13,14,15]. Among them the most commonly used is the cubic PM, which has a phase function of the form…”

Section: Wavefront Coding Frameworkmentioning

confidence: 99%

Design and implementation of a scene-dependent dynamically selfadaptable wavefront coding imaging system

Carles

Ferran

Carnicer

et al. 2012

Computer Physics Communications

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A computational imaging system based on wavefront coding is presented. Wavefront coding provides an extension of the depth-of-field at the expense of a slight reduction of image quality. This trade-off results from the amount of coding used. By using spatial light modulators, a flexible coding is achieved which permits it to be increased or decreased as needed. In this paper a computational method is proposed for evaluating the output of a wavefront coding imaging system equipped with a spatial light modulator, with the aim of thus making it possible to implement the most suitable coding strength for a given scene. This is achieved in an unsupervised manner, thus the whole system acts as a dynamically selfadaptable imaging system. The program presented here controls the spatial light modulator and the camera, and also processes the images in a synchronised way in order to implement the dynamic system in real time. A prototype of the system was implemented in the laboratory and illustrative examples of the performance are reported in this paper. The program implements an enhanced wavefront coding imaging system able to adapt the degree of coding to the requirements of a specific scene. The program controls the acquisition by a camera, the display of a spatial light modulator and the image processing operations synchronously. The spatial light modulator is used to implement the phase mask with flexibility given the trade-off between depth-of-field extension and image quality achieved. The action of the program is to evaluate the depth-of-field requirements of the specific scene and subsequently control the codifing established by the spatial light modulator, in real time.

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“…Wavefront coding (WFC) is an optical-digital hybrid imaging technique developed to extend the depth of field of conventional optical systems [1][2][3]. By introducing a phase mask into the pupil of the system to modulate the wavefront of the incident light, it is possible to make the point-spread function (PSF) nearly invariant over a wide range of defocus.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Wavefront Coding Phase Mask Applied to 5X-40X Micro-Objectives Simultaneously

Liu

Miao

Sui

et al. 2015

Journal of the Optical Society of Korea

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A wavefront coding (WFC) technique provides an extension of the depth of field for a microscopy imaging system with slight loss of image spatial resolution. Through the analysis of the relationship between the incidence angle of light at the phase mask and the system pupil function, a mixing symmetrical cubic phase mask (CPM) applied to 5X-40X micro-objectives is optimized simultaneously based on point-spread function (PSF) invariance and nonzero mean values of the modulation transfer function (MTF) near the spatial cut-off frequency. Optimization results of the CPM show that the depth of field of these micro-objectives is extended 3-10 times respectively while keeping their resolution. Further imaging simulations also prove its ability in enhancing the defocus imaging.

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Phase plate to extend the depth of field of incoherent hybrid imaging systems

Cited by 126 publications

References 16 publications

Transfer efficiency and depth invariance in computational cameras

Transfer efficiency and depth invariance in computational cameras

Design and implementation of a scene-dependent dynamically selfadaptable wavefront coding imaging system

Optimization of Wavefront Coding Phase Mask Applied to 5X-40X Micro-Objectives Simultaneously

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