Phase mask selection in wavefront coding systems: A design approach

Carles, Guillem; Carnicer, Artur; Bosch, Salvador

doi:10.1016/j.optlaseng.2010.03.008

Cited by 31 publications

(18 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These include both full-reference or no-reference measures of the PSF, 5, 20 the OTF, 12, 30 the MTF, 31, 32 the PTF, 33 specific images 19,34,35 or image distributions. 28 One of the most challenging issues related to optimization of hybrid imaging systems is to include the entire imaging acquisition and observation which therefore includes detector noise, image processing, and the human visual perception of the final image.…”

Section: Optimization Of Phase Masksmentioning

confidence: 99%

Development of compact optical zoom lenses with extended-depth-of-field

Demenikov

2012

SPIE Proceedings

View full text Add to dashboard Cite

Development of compact optical zoom lenses for integration in mobile phones is the goal of many companies. Optical zoom lenses change their focal length by the movement of lens elements or change in surface curvature or refractive index and this complicates the zoom lens design. Extended depth-of-field (EDOF) techniques provides the mean to simplify and miniaturize zoom lens designs with moving lens elements and a new EDOF optimization technique is presented. Finally, the starting point and an example of a compact optical zoom lens design with EDOF is also described.

show abstract

Section: Optimization Of Phase Masksmentioning

confidence: 99%

Development of compact optical zoom lenses with extended-depth-of-field

Demenikov

2012

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…1 the system is endowed with larger DOFs but the artefacts are more evident and the image quality is poorer. Generally, the trade-off results in an optimum PM strength given the required DOF and the characteristics of the optical system [16,17,18].…”

Section: Wavefront Coding Frameworkmentioning

confidence: 99%

“…The design may depend on different factors: characteristics of the optical elements in the system, spectral characteristics of the scene, subjective evaluation of the invariance achieved, etc. However, in any case, given a PM shape, its strength will settle the trade-off between the amount of invariance achieved and the image degradation [16]. With this in mind, the proposed method stores and uses a list of different PMs adjusted in some manner to the values in the list of test amounts of defocus.…”

Section: Selection Tablementioning

confidence: 99%

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

Carles

Ferran

Carnicer

et al. 2012

Computer Physics Communications

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…And hence it is useful if the strength of the phase mask is to be optimized, for example to find the suitable value of α in the case of a cubic phase mask. 4 However, the definition of the evaluation function here needs to be generalized. Since the shape of the MPM is freely adaptable, it may happen that Ψ * (W 20 , φ MP M ) > Ψ * (W 20 , φ MP M ) even for W 20 < W 20 .…”

Section: Phase Mask Evaluationmentioning

confidence: 99%

“…4 However, this trend is accomplished if the phase mask shape is fixed. Different shapes will perform differently and a number of shapes were previously proposed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Iterative design of mesh-defined phase masks for wavefront coding

Carles¹,

Carnicer²,

Bosch³

2010

SPIE Proceedings

View full text Add to dashboard Cite

A new phase mask typology for wavefront-coding is proposed, the meshed phase mask (MPM). It is intended to be a flexible form in order to be easily adaptable. The use of an evaluating criterion to measure the performance of the MPM is used to optimize its shape. The MPM is uniquely defined by the fixed phase in a number of control points equally spaced in the pupil area. These control points define a regular mesh, and the continuous MPM phase surface is obtained from cubic spline interpolation. A global search algorithm is used to optimize the values at the control points, thus optimizing the MPM. The preliminary results show an improvement over the conventional cubic phase mask, especially in reducing the undesired artefacts in the final restored images.

show abstract

Phase mask selection in wavefront coding systems: A design approach

Cited by 31 publications

References 23 publications

Development of compact optical zoom lenses with extended-depth-of-field

Development of compact optical zoom lenses with extended-depth-of-field

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

Iterative design of mesh-defined phase masks for wavefront coding

Contact Info

Product

Resources

About