Point spread function characteristics analysis of the wavefront coding system

Zhang, Wenzi; Ye, Zi; Zhao, Ting; Chen, Yanping; Yu, Feihong

doi:10.1364/oe.15.001543

Cited by 34 publications

(13 citation statements)

References 10 publications

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“…Following the assumptions of Section 3.4, we approximate the diffracted energy distribution using the following Gaussian function [Zhang et al 2007]:…”

Section: Retinal Blurmentioning

confidence: 99%

Focus 3D

et al. 2013

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We present a glasses-free 3D display design with the potential to provide viewers with nearly correct accommodative depth cues, as well as motion parallax and binocular cues. Building on multilayer attenuator and directional backlight architectures, the proposed design achieves the high angular resolution needed for accommodation by placing spatial light modulators about a large lens: one conjugate to the viewer's eye, and one or more near the plane of the lens. Nonnegative tensor factorization is used to compress a high angular resolution light field into a set of masks that can be displayed on a pair of commodity LCD panels. By constraining the tensor factorization to preserve only those light rays seen by the viewer, we effectively steer narrow high resolution viewing cones into the user's eyes, allowing binocular disparity, motion parallax, and the potential for nearly correct accommodation over a wide field of view. We verify the design experimentally by focusing a camera at different depths about a prototype display, establish formal upper bounds on the design's accommodation range and diffraction-limited performance, and discuss practical limitations that must be overcome to allow the device to be used with human observers.

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“…Following the assumptions of Section 3.4, we approximate the diffracted energy distribution using the following Gaussian function [Zhang et al 2007]:…”

Section: Retinal Blurmentioning

confidence: 99%

Focus 3D

et al. 2013

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show abstract

“…Thirdly, the comparison is made once the detection and restoration stages have been performed, and hence accounts for any influence they may have. And finally, it is worth mentioning that since it is based on OTF analysis, it leads to a general design and does not require any particular scene to evaluate the imaging performance (which would influence the evaluation and be vulnerable to PSF shifting or mismatching effects [4] ). Furthermore, note that no noise considerations are taken into account in this merit measure.…”

Section: Phase Mask Strength Optimizationmentioning

confidence: 99%

“…It relies on the optical modification of the transmitted wavefront by means of a phase mask placed at the aperture stop of the system. The design of this phase mask allows image formation that is invariant despite the effects of different optical aberrations [1][2][3][4] . Such a modification causes blurring of the images captured by a CCD in the sensor plane.…”

Section: Introductionmentioning

confidence: 99%

Phase mask selection in wavefront coding systems: A design approach

Carles

Carnicer

Bosch

2010

Optics and Lasers in Engineering

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“…A focus function is always modeled as a function that has a maximum value at the bestfocused image and decreases as the defocus increases [1]. Efforts are under way to develop focus functions relevant to widely used applications, such as automated microscopy, holography, deblurring, image refocusing, iris recognition, and depth of focus estimation [2].…”

Section: Introductionmentioning

confidence: 99%

Flexible focus function consisting of convex function and image enhancement filter

Wang

Qian

et al. 2014

Opt. Express

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We propose a new focus function Λ that, like many of the existing focus functions, consists of a convex function and an image enhancement filter. Λ is rather flexible because for any convex function and image enhancement filter, it is a focus function. We proved that Λ is a focus function using a model and Jensen's inequality. Furthermore, we generated random Λs and experimentally applied them to simulated and real blurred images, finding that 98% and 99% of the random Λs, respectively, have a maximum value at the best-focused image and most of them decrease as the defocus increases. We also applied random Λs to motion-blurred images, blurred images in different-sized windows, and blurred images with different types of noise. We found that Λ can be applied to motion blur and is robust to different-sized windows and different noise types.

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Point spread function characteristics analysis of the wavefront coding system

Cited by 34 publications

References 10 publications

Focus 3D

Focus 3D

Phase mask selection in wavefront coding systems: A design approach

Flexible focus function consisting of convex function and image enhancement filter

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