Applications of wavefront coded imaging

Narayanswamy, Ramkumar; Baron, Alan; Chumachenko, Vladislav; Greengard, Adam

doi:10.1117/12.527033

Cited by 12 publications

(4 citation statements)

References 1 publication

(1 reference statement)

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“…Traditional approaches to imaging system design do not allow good imaging over desired volumes [6]. Using WFCDesign, an iris recognition system employing Wavefront Coding was designed to perform well (in terms of iris score) over a large volume for iris recognition.…”

Section: Biometrics and Securitymentioning

confidence: 99%

Computational imaging design tools and methods

Johnson

Macon

Rauker

2004

Novel Optical Systems Design and Optimization VII

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Systems which transform optical wavefronts into digital information for imagery or machine interpretation lack suitable design tools and methods. In Wavefront Coded® imaging systems in particular, the signal processing and the optics must be jointly considered to achieve an optimal solution. Computational imaging systems have recently been designed at CDM Optics based on human interpretation of images and guided by machine (algorithmic) interpretations. CDM is generating an integrated design package called WFCDesign™ to provide for truly joint optimization of computational imaging systems where both physical and algorithmic goals can be jointly realized with a high degree of efficiency and accuracy. WFCDesign interfaces to a multitude of commercial analysis, design, signal processing, and simulation packages, enabling joint optimization using industry-standard tools. Methods for approaching the optimization problem including merit functions and optimizer issues are discussed. An example of a computational design with Wavefront Coding™ based on a digital algorithm's performance (as opposed to strictly optical metrics such as spot size or aberration curves) is provided. An outline and discussion of the WFCDesign™ package highlights the capabilities of our flexible approach and modular architecture and provides insight into the future of computational imaging design tools.

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Section: Biometrics and Securitymentioning

confidence: 99%

Computational imaging design tools and methods

Johnson

Macon

Rauker

2004

Novel Optical Systems Design and Optimization VII

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“…It has been applied in many fields because of its particular character [3]. Dowski et al [4] illustrated an athermalized, refractive, silicon/germanium IR imaging system with WFC technology subjected to an ambient temperature range of −20°C to 70°C.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of an off-axis three mirror anastigmatic system with wavefront coding technology

Yan

Tao

2012

Appl. Opt.

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Wavefront coding (WFC) is a kind of computational imaging technique that controls defocus and defocus related aberrations of optical systems by introducing a specially designed phase distribution to the pupil function. This technology has been applied in many imaging systems to improve performance and/or reduce cost. The application of WFC technology in an off-axis three mirror anastigmatic (TMA) system has been proposed, and the design and optimization of optics, the restoration of degraded images, and the manufacturing of wavefront coded elements have been researched in our previous work. In this paper, we describe the alignment, the imaging experiment, and the image restoration of the off-axis TMA system with WFC technology. The ideal wavefront map is set to be the system error of the interferometer to simplify the assembly, and the coefficients of certain Zernike polynomials are monitored to verify the result in the alignment process. A pinhole of 20 μm diameter and the third plate of WT1005-62 resolution patterns are selected as the targets in the imaging experiment. The comparison of the tail lengths of point spread functions is represented to show the invariance of the image quality in the extended depth of focus. The structure similarity is applied to estimate the relationship among the captured images with varying defocus. We conclude that the experiment results agree with the earlier theoretical analysis.

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“…It has been demonstrated that wavefront-coding techniques reduce complexity in optical design 12 and are capable of correcting or minimizing the effects of a host of aberrations such as Petzval curvature, astigmatism, chromatic aberration, spherical aberration, and temperaturerelated misfocus. [13][14][15][16][17] In this work, the behavior of a wavefront coding imager incorporating a phase mask with an odd-symmetric quadratic phase profile is examined by conducting a mathematical analysis of its spatial frequency response. Development of an exact analytical representation of the OTF of a cubic-pm system allowed a comprehensive spatial frequency analysis of such an imager.…”

Section: Introductionmentioning

confidence: 99%

Frequency analysis of the wavefront-coding odd-symmetric quadratic phase mask

Somayaji

Christensen

2007

Appl. Opt.

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A mathematical analysis of the frequency response of the wavefront-coding odd-symmetric quadratic phase mask is presented. An exact solution for the optical transfer function of a wavefront-coding imager using this type of mask is derived from first principles, whose result applies over all misfocus values. The misfocus-dependent spatial filtering property of this imager is described. The available spatial frequency bandwidth for a given misfocus condition is quantified. A special imaging condition that yields an increased dynamic range is identified.

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Applications of wavefront coded imaging

Cited by 12 publications

References 1 publication

Computational imaging design tools and methods

Computational imaging design tools and methods

Experimental study of an off-axis three mirror anastigmatic system with wavefront coding technology

Frequency analysis of the wavefront-coding odd-symmetric quadratic phase mask

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