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检索条件"主题词=wavefront coding"

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Iterative optimization procedure based design of phase masks suitable for computational depth of field extension 5

Iterative optimization procedure based design of phase masks...

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Conference on Optoelectronic Imaging and Multimedia Technology V

作者： Xia, Jingjing Zhang, Ling Zhao, Hui Fan, Xuewu Chinese Acad Sci Xian Inst Opt & Precis Mech Space Opt Lab Xian 710019 Shaanxi Peoples R China Shaanxi Normal Univ 620 West Changan St Xian 710119 Shaanxi Peoples R China

ISBN: (纸本)9781510622333

In wave-front coded imaging system, the phase mask placed in the pupil plane of the imaging system aims to reshape the PSF (point spread function) or OTF (optical transfer function) to realize DOF (depth of field) extension. How to design a suitable phase mask to provide a highly controlled response of system PSF or OTF is crucial to computational imaging application. Traditionally, AF (ambiguity function) is a powerful tool to assess the DOF extension effect generated by phase masks with known phase function. However, in this paper, we investigate an iterative optimization based procedure to recover the unknown phase mask using AF in a backward way. First, a set of desired PSFs or OTFs at different defocus planes is combined together to construct an initial estimate of AF. Second, the corresponding mutual function is calculated through Fourier transform. Third, SVD (singular value decomposition) is applied to the mutual function. Fourth, only the term corresponding to the biggest eigenvalue is kept and inverse Fourier transform is used to generate a new estimate of AF. Fifth, the input desired OTFs are used to update the newly estimated AF. This procedure iterates until the OTFs extracted from the estimated AF are highly consistent with the input ones using the MSE (mean-square-error) as criterion. In the paper, we systematically study this powerful procedure using numerical simulation and investigate the probability of recovering the rectangular non-separable phase masks. After that, experiments are carried out to justify the effectiveness of the procedure.

关键词： wavefront coding computational imaging ambiguity function

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Recent advances in joint optical-digital design for optronics applications

Recent advances in joint optical-digital design for optronic...

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Conference on Advanced Optics for Defense Applications - UV through LWIR

作者： Burcklen, Marie-Anne Diaz, Frederic Lepretre, Francois Lee, Mane-Si Laure Delboulbe, Anne Loiseaux, Brigitte Millet, Philippe Duhem, Francois Lemonnier, Fabrice Sauer, Herve Goudail, Francois THALES Angenieux F-42570 St Heand France THALES Res & Technol F-91767 Palaiseau France Grad Sch Inst Opt F-91767 Palaiseau France

ISBN: (纸本)9781510600638

Increasing the capture volume of visible cameras while maintaining high image resolutions, low power consumption and standard video-frame rate operation is of utmost importance for hand-free night vision goggles or embedded surveillance systems. Since such imaging systems require to operate at high aperture, their optical design has become more complex and critical. Therefore new design alternatives have to be considered. Among them, wavefront coding changes and desensitizes the modulation transfer function (MTF) of the lens by inserting a phase mask in the vicinity of the aperture stop. This smart filter is combined with an efficient image processing that ensures optimal image quality over a larger depth of field. In this paper recent advances are discussed concerning design and integration of a compact imaging system based on wavefront coding. We address the design, the integration and the characterization of a High Definition (HD) camera of large aperture (F/1.2) operating in the visible and near infrared spectral ranges, endowed with wavefront coding. Two types of phase masks (pyramidal and polynomial) have been jointly optimized with their deconvolution algorithm in order to meet the best performance along an increased range of focus distances and manufactured. Real time deconvolution processing is implemented on a Field Programmable Gate Array. It is shown that despite the high data throughput of an HD imaging chain, the level of power consumption is far below the initial specifications. We have characterized the performances with and without wavefront coding through MTF measurements and image quality assessments. A depth-of-field increase up to x2.5 has been demonstrated in accordance with the theoretical predictions.

关键词： hybrid imaging system joint optical-digital design wavefront coding

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LOW-COMPLEXITY DIGITAL FILTER BANK FOR STRONGLY ABERRATED OPTICAL SYSTEMS HAVING VARIABLE F-NUMBERS

LOW-COMPLEXITY DIGITAL FILTER BANK FOR STRONGLY ABERRATED OP...

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16th IEEE International Conference on Image Processing

作者： Feng, Guotong Robinson, M. Dirk Berkner, Kathrin Ricoh Innovat Inc Menlo Pk CA 94025 USA

ISBN: (纸本)9781424456536

It has been shown that electro-optical imaging systems designed by integrating optics and digital processing provide system-level advantages such as extended depth-of-field and lower optical component costs. In such imaging systems, the strength of the optical aberration or blur can dramatically change with the f-number, and hence different digital filters in the subsequent digital processing are required to correct the captured images at different f-numbers. However, implementing such number of filters in hardware requires expensive computational resources, which in turn increase the overall system cost. In this paper, we propose a simple image filtering approach which uses a weighted sum of a set of component finite impulse response (FIR) filters to effectively apply a different composite FIR filter for each f-number. The simulation results demonstrate that our approach achieves desirable image quality for variable f-numbers, while substantially reducing the complexity in hardware implementation.

关键词： Electro-optical imaging filter bank FIR sharpening spherical aberration extended depth-of-field wavefront coding

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Amplitude and phase filters for mitigation of defocus and third-order aberrations

Amplitude and phase filters for mitigation of defocus and th...

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Conference on Optical Design and Engineering

作者： Mezouari, S Muyo, G Harvey, AR Heriot Watt Univ Dept Comp Sci & Engn Edinburgh EH14 4AS Midlothian Scotland

ISBN: (纸本)0819451339

This paper gives a review on the design and use of both amplitude filters and phase filters to achieve a large focal depth in incoherent imaging systems. Traditional optical system design enhances the resolution of incoherent imaging systems by optical-only manipulations or some type of post-processing of an image that has been already recorded. A brief introduction to recent techniques to increase the depth of field by use of hybrid optical/digital imaging system is reported and its performance is compared with a conventional optical system. This technique, commonly named wavefront coding, employs an aspherical pupil plane element to encode the incident wavefront in such a way that the image recorded by the detector can be accurately restored over a large range of defocus. As reported in earlier work, this approach alleviates the effects of defocus and its related aberrations whilst maintaining diffraction-limited resolution. We explore the control of third order aberrations (spherical aberration, coma, astigmatism, and Petzval field curvature) through wavefront coding. This method offers the potential to implement diffraction-limited imaging systems using simple and low-cost lenses. Although these performances are associated with reductions in signal-to-noise ratio of the displayed image, the jointly optimised optical/digital hybrid imaging system can meet some specific requirements that are impossible to achieve with a traditional approach.

关键词： apodizer depth of field pupil plane wavefront coding defocus spherical and third order aberration

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The research for EO imaging system simulation

The research for EO imaging system simulation

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International Conference on Photoelectronic Detection and Imaging

作者： Yang Hao-ming Wang Ling-jie Fang Zhi-liang Zhang Jian-ping Nankai Univ Inst Modern Opt MOE Key Lab Optoelect Informat Sci & Technol Tianjin 300071 Peoples R China Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

ISBN: (纸本)9780819467669

Electric-Optical (EO) imaging systems are modem systems, especially the one consists of aspheric optics and image processing called wavefront coding system. The design concept of this kind system is totally different from the traditional image system. The trade-off between the complexity of the image deconvolution and the depth of focus extended should be considered. So we establish a simulation model consisting of optical optimization design, system signal-to-noise ratio analysis and recovered image evaluation. The data can be exchanged among them. This simulation tools will be very useful in system design process.

关键词： image system system design wavefront coding simulation tools

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Achieving the potential of hybrid imaging systems

Achieving the potential of hybrid imaging systems

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Conference on Adaptive Coded Aperture Imaging, Non-Imaging, and Unconventional Imaging Sensor Systems II

作者： Harvey, Andrew R. Muyo, Gonzalo Demenikov, Mads Vettenburg, Tom Heriot Watt Univ Sch Engn & Phys Sci Edinburgh EH14 4AS Midlothian Scotland

ISBN: (纸本)9780819483140

The use of hybrid optical-digital techniques facilitates improved optimisation of imaging systems. It involves the combined use of optical coding of an image using pupil-plane phase-modulation of the transmitted wavefront and post-detection digital decoding. Previous research in hybrid imaging tends to emphasize constancy of the modulation transfer function with aberrations and ignore the significant variations in the phase transfer function. We show that the restoration artefacts introduced by phase mismatch effects can also be used to deduce the defocus PSF, and when this is achieved, an overall improvement in image quality can be attained. Both numerical simulations and experimental images of hybrid imaging systems are presented.

关键词： Computational imaging wavefront coding phase masks artefacts signal-to-noise ratio

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Optimization of Hybrid Optics with Multilevel Phase Mask for Improved Depth of Focus Broadband Imaging 7

Optimization of Hybrid Optics with Multilevel Phase Mask for...

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7th European Workshop on Visual Information Processing (EUVIP)

作者： Katkovnik, Vladimir Ponomarenko, Mykola Egiazarian, Karen Tampere Univ Technol Signal Proc Lab Tampere Finland

ISBN: (纸本)9781538668979

This paper is devoted to designing of hybrid refractive/diffractive optics for high-quality imaging with improved depth of focus (DoF). The novelty of the concept is in sharing of the optical power of the refractive lens between the lens and a multilevel phase mask (MLM) as a diffractive optical element (DOE). The efficiency of the design is confirmed by numerical results. Broadband multiwavelength test-images are exploited for the design and testing of the system. It is shown that the obtained hybrid optical system in combination with computational inverse imaging provides both a better image quality (due to the robustness of the designed optics to chromatic aberrations) and an extended depth of focus as compared with the refractive lens and the diffractive lensless design with MLM.

关键词： Multilevel diffractive optical elements multilevel phase mask design wavefront coding extended depth of focus computational imaging chromatic aberrations inverse imaging

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3D imaging and ranging in a snapshot

3D imaging and ranging in a snapshot

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Conference on Optical Systems Design - Computational Optics

作者： Zammit, Paul Carles, Guillem Harvey, Andrew R. Univ Glasgow Glasgow G12 8QQ Lanark Scotland

ISBN: (纸本)9781628418194

Imaging samples with a depth in excess of the depth of field of the objective poses a serious challenge in microscopy. The available techniques such as focus-stacking accomplish the task;however, besides necessitating complicated optical and mechanical arrangements, these techniques often exhibit very long acquisition times. As a result, their applicability is limited to static samples. We describe a simple and practical hybrid 3D imaging technique which permits the acquisition of 3D images in a single snapshot. Additionally, the proposed method solves the post-recovery artefact formation problem which plagues hybrid imaging systems;thus, enabling high-quality, artefact-free images to be obtained. Experimental results indicate that this method can yield an image quality comparable to that given by a focus-stack (which can require up to a few hundred snapshots) from a single snapshot.

关键词： 3D imaging wavefront coding artefacts hybrid imaging extended depth of field microscopy 4D microscopy

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Research on the effect of phase mask to extend the depth of field of optical system

Research on the effect of phase mask to extend the depth of ...

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3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies

作者： Chen Xiaorong Dai Shuguang Xia Chunlei Shanghai Univ Sci & Technol Shanghai 200093 Peoples R China

ISBN: (纸本)9780819468802

The technique of wavefront coding can extend the depth of field of incoherent optical systems in which the design of phase mask is very important. Several designs of phase mask are proposed in this paper, the MTFs(magnitude of optical transfer function) of these methods are deduced and the figures of MTFs are compared and discussed. The simulation results are presented that MTFs are insensitive to misfocus and never to be zero which would occur in traditional incoherent optical systems. Based on subjective evaluation and quantitative simulation results, we believe that special design of phase masks is effective to expand the depth of an incoherent optical system.

关键词： wavefront coding phase mask depth of field misfocus

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A new approach to extended focus for high-speed, high-resolution biological microscopy

A new approach to extended focus for high-speed, high-resolu...

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Conference on Three-Dimensional and Multidimensional Microscopy - Image Acquisition and Processing XIII

作者： Abrahamsson, Sara Usawa, Satoru Gustafsson, Mats Univ Calif San Francisco Dept Physiol Program Bioengn 1700-4th St San Francisco CA 94143 USA

ISBN: (纸本)0819461326

Microscopic study of rapid biological processes often requires both high resolution and high acquisition speed. When the speed requirement precludes acquiring a full 3D focal series at each time point, it can be attractive to sacrifice all axial information and instead record a single, 2D image per time point. This can be done at very high frame rates. High-resolution objectives, however, have a very short depth of focus. There are several established methods to achieve extended depth of focus, including annular pupil masks;mechanical sweeping of the focus and wavefront coding, which uses a pupil-plane optical device to introduce geometric aberrations. We have developed a new pupil plane approach where the light is manipulated chromatically rather than geometrically. A phase mask with circularly symmetric stair steps divides the pupil plane into a series of annular zones. The stair steps are large compared to the coherence length of the observation light, so that images from different zones form independently and combine incoherently into a final image. Each zone carries only a fraction of the objective's axial resolution, but the larger zones still carry the full lateral resolution of the objective. The incoherent addition of the different single-zone images results in a smooth and circularly symmetric point spread function with a depth of focus that is extended by a factor approximately equal to the number of zones in the mask. The method has been demonstrated both on bead samples and on whole cells with a performance that is well in accordance with the theoretical predictions.

关键词： extended focus depth of field high-speed imaging wide-field microscopy wavefront coding

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