Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

Le, Van Nhu; Fan, Zhigang; Minh, Nghia Pham; Chen, Shouqian

doi:10.1117/1.oe.54.3.035103

Cited by 32 publications

(9 citation statements)

References 15 publications

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“…Application of generalized cubic phase mask for design of zoom systems for visual waveband is a topic of papers [8], [9], [10], [11], [12]. A wide variety of different types of phase masks have been studied in order to increase the depth of field: cubic and generalized cubic [3], [4] logarithmic [13], exponential [14], hyperbolic [15], square-root [16], etc. Some of these masks have been compared in [17], where signal-to-noise ratio is taken as a comparative metric.…”

Section: Relevant Publicationsmentioning

confidence: 99%

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A novel two- and multi-level binary phase mask design for enhanced depth-of-focus

Katkovnik,

Hogasten,

Egiazarian

2017

Preprint

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This paper introduces a two-and multi-level binary phase mask design for improved depth of focus. A novel technique is proposed incorporating cubic and generalized cubic wavefront coding (WFC). The obtained system is optical-electronic requiring computational deblurring post-processing, in order to obtain a sharp image from the observed blurred data. A midwave infrared (MWIR) system is simulated showing that this design will produce high quality images even for large amounts of defocus. It is furthermore shown that this technique can be used to design a flat, single optical element, systems where the phase mask performs both the function of focusing and phase modulation. It is demonstrated that in this lensless design the WFC coding components can be omitted and WFC effects are achieved as a result of the proposed algorithm for phase mask design which uses the quadratic phase of the thin refractive lens as the input signal.

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Section: Relevant Publicationsmentioning

confidence: 99%

“…(e.g. [15], [16]). Note, that the functions ϕ(x, y) used for WFC are not restricted to the interval [0, 2π], i.e.…”

Section: Optical Setup Notation Assumptionsmentioning

confidence: 99%

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A novel two- and multi-level binary phase mask design for enhanced depth-of-focus

Katkovnik,

Hogasten,

Egiazarian

2017

Preprint

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“…There are two types of phase mask developed to control the point spread function (PSF), such as the radially symmetrical phase mask and asymmetrical phase mask. There are some asymmetrical phase masks introduced to control the point spread function, such as the cubic phase mask [4], the tangent phase mask [5], the logarithm phase mask [6], the square roof phase mask [7], the sinusoidal phase mask [8], metasurfaces [9], Freeform [10]. There are some radially symmetrical phase masks suggested to extend the depth of eld, such as quartic phase mask (QPM) [11], logarithmic axicon [12], diffraction hybrid lens [13], and logarithmic asphere [14].…”

Section: Introductionmentioning

confidence: 99%

Imaging quality improvement for wavefront colding system with radially symmetrical phase mask

2023

Opt Quant Electron

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In this paper, we introduce the novel method to improve the image quality of the optical imaging system with the radially symmetrical phase masks. By introduced a 0-π phase mask into the radially symmetrical phase mask, the new phase mask is generated, which produces the dark-shape point spread function.Next, by rotating this phase mask with the amplitude mask for different angles, the point spread function is rotated by the same angle. After, the digital processing is used to restore the high-quality image. The simulation results demonstrated the effectiveness of the proposed method in comparison to the previously radially symmetrical phase mask.

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“…[5][6][7][8][9][10][11][12][13][14][15][16] Nevertheless, it has been shown that cubic and trefoil-shaped phases are most used to achieve high-quality images when spherical aberration, 10,11) astigmatism 14,15) and high orderaberrations 15) are also present in the system. WFC can be found in many different applications such as in ophthalmic optics, [15][16][17] iris recognition, 18,19) complexity reduction in optical systems, 20) control of thermal defocus in infrared systems, 21) barcode reading, 22) and microscopy, 23) among many others.…”

Section: Introductionmentioning

confidence: 99%

Effect of spherical aberration in trefoil phase plates on color wavefront coding

Olvera-Angeles

Padilla-Vivanco

Sasián

et al. 2018

Jpn. J. Appl. Phys.

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Wavefront coding is a technique that makes use of aspheric phase masks and image processing to greatly increase the depth of focus and/or reduce the cost of imaging systems. The phase mask adds a controlled amount of aberrations to the optical system in such a way that invariant imaging properties are achieved over a wide range of defocus. When aspheric phase plates are fabricated, their shape has to be carefully designed to avoid introducing other aberrations into the optical system, which could reduce its performance. In this work, we will show how inherent spherical aberration for trefoil-shaped phase plates reduces the quality of color images. Results will be illustrated with numerical simulations. We will show that a fourth-order polynomial added to a trefoil shaped phase mask can avoid the plate generating undesired spherical aberration that will affect the final quality of the decoded color images.

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Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

Cited by 32 publications

References 15 publications

A novel two- and multi-level binary phase mask design for enhanced depth-of-focus

A novel two- and multi-level binary phase mask design for enhanced depth-of-focus

Imaging quality improvement for wavefront colding system with radially symmetrical phase mask

Effect of spherical aberration in trefoil phase plates on color wavefront coding

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