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检索条件"主题词=wavefront coding"

共 157 条记录，以下是141-150 订阅

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Evaluating distances using a coded lens camera and a blur metric

Evaluating distances using a coded lens camera and a blur me...

引用

Conference on Image Processing - Machine Vision Applications IV

作者： Angot, Ludovic J. Chang, Chuan-Chung Chen, Yung-Lin Ind Technol Res Inst ITRI Elect & Optoelect Labs Taipei Taiwan

ISBN: (纸本)9780819484147

We propose a method and a system to measure distances to a target and at the same time obtaining an image of the target. The system is based on a wavefront coded lens and an image processing unit. The method requires a calibration phase where a blur metric is related to the distance of the target. The distance to the target for any position is then obtained by computing the blur metric of the target and using the calibration data. The method and system are easy to manufacture and provide an alternative to other distance measuring methods and devices, while also producing an image of the scene. The target is a printed image of pseudo random black and white elements which can be stick or placed nearby objects of which distance is to be evaluated.

关键词： machine vision wavefront coding depth evaluation

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Noise modeling for design and simulation of computational imaging systems

Noise modeling for design and simulation of computational im...

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Conference on Visual Information Processing XIII

作者： Wach, HB Dowski, ER CDM Opt Inc Boulder CO 80303 USA

ISBN: (纸本)0819453617

Understanding signal and noise quantities in any practical computational imaging system is critical. Knowledge of the imaging environment, optical parameters, and detector sensitivity determine the signal quantities but often noise quantities are assumed to be independent of the signal and either uniform or Gaussian additive. These simplistic noise models do not accurately model actual detectors. Accurate noise models are needed in order to design optimal systems. We describe a noise model for a modem APS CMOS detector and a number of noise sources that we will be measuring. A method for characterizing the noise sources given a set of dark images and a set of flat field images is outlined. The noise characterization data is then used to simulate dark images and flat field images. The simulated data is a very good match to the real data thus validating the model and characterization procedure.

关键词： wavefront coding noise modeling image sensor noise system design

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Optimization of phase mask based iris imaging system through the optical characteristics

Optimization of phase mask based iris imaging system through...

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Conference on Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense XII

作者： He Yu-qing Li Jia-qi Pan Jing Li Ying-jiao Beijing Inst Technol Sch Optoelect Minist Educ China Key Lab Photoelect Imaging Technol & Syst Beijing 100081 Peoples R China

ISBN: (纸本)9780819495020

Iris recognition is the most reliable method in personal identification. However, the current fixed-focus iris imaging system has small depth of field(DOF), which limits the wide application of the iris recognition system. This paper presents the design method and optimization of a phase mask based iris imaging system. Through wavefront coding, it can extend the DOF and enhance the convenience of iris image acquisition. Through analyzing the modulation transfer function and optical parameters of the cubic phase mask, we can get the wavefront coding iris imaging system's optimal parameter and it's structure. Experimental results show that the cubic phase mask based iris imaging system has larger DOF and better imaging performance.

关键词： Iris Recognition wavefront coding Depth of field extension Phase mask Modulation transfer function

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Design and optimization of the cubic-phase pupil for the extension of the depth of field of task-based imaging systems

Design and optimization of the cubic-phase pupil for the ext...

引用

Conference on Optical Information Systems IV

作者： Bagheri, Saeed Silveira, Paulo E. X. Narayanswamy, Ramkumar de Farias, Daniela Pucci MIT 77 Massachusetts AveRoom 3-355A Cambridge MA 02139 USA CDM Opt Inc Boulder CO 80303 USA

ISBN: (纸本)0819463906

In this article we study the use of the cubic-phase pupil function for extension of the depth of field of task-based imaging systems. In task-based design problems the resolution of interest varies as a function of the object distance due to change in magnification. This introduces a new challenge in the design process. We discuss how the optimal design criterion of task-based imaging systems is fundamentally different from that of visual imaging systems and formulate the optimization problem. We discuss how the use of the cubic-phase pupil function changes the spectral signal-to-noise-ratio (SNR) and modulation transfer function (MTF) in the range of the depth of field in order to fulfill our design requirements. We introduce an approximation to the problem of maximizing SNR and show that it is amenable to analytic treatment. We derive an explicit expression for the optimized cubic-phase pupil function parameters for a general problem of this class, thus establishing an upper bound for the extension of the depth of field using cubic-phase wavefront coding.

关键词： wavefront coding cubic-phase pupil function task-based imaging computational imaging modulation transfer function design and optimization

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Femtosecond digital holography based on Spatial Light Modulator

Femtosecond digital holography based on Spatial Light Modula...

引用

International Conference on Optical Instruments and Technology - Optical Systems and Modern Optoelectronic Instruments

作者： Lu, Xiaowei Li, Jingzhen Chen, Hongyi Shenzhen Univ Coll Elect Sci & Technol Shenzhen Key Lab Micro Nano Photon Informat Techn Shenzhen 518060 Peoples R China

ISBN: (纸本)9780819499608

A high-speed digital holography based on a liquid crystal Spatial Light Modulator (LC-SLM) is presented. The production of multi-beam and control of their delay time can be achieved by controllable wavefront coding theory. In this paper, a Dammann phase grating was designed using a SLM to product multi-beam for extremely high speed digital holographic imaging. The required beam deflection could be obtained by adjusting programmable phase mask for controlling the spatial diffraction of input beam. The framing time is decided by interval beam angles and the distances between input plane and record plane. Theoretical derivate of generation multi beams based on SLM was proposed, and phase recover software was also made.

关键词： Femtosecond digital holography Spatial Light Modulator Dammann phase grating wavefront coding

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Restoration of encoded images by a trefoil phase mask using deep learning 25

Restoration of encoded images by a trefoil phase mask using ...

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Conference on Current Developments in Lens Design and Optical Engineering XXV

作者： Reyes-Alfaro, Jose M. Toxqui-Quitl, Carina Espejel-Rivera, Maria A. Gonzalez-Amador, Enrique Padilla-Vivanco, Alfonso Univ Politecn Tulancingo Comp Vis Lab Ingn 100 Tulancingo De Bravo 43629 Hidalgo Mexico

ISBN: (纸本)9781510679221;9781510679238

Depth of field (DoF) determines the focused object depth in an optical imaging system. An extended depth of field (EDoF) should provide a larger axial resolution without significantly sacrificing the spatial resolution of the image. An optical-computational technique that uses a Trefoil phase mask (PM) to optically encode the scene and a convolutional neural network (CNN) to restore the acquired encoded image is presented. Simulations and experimental results are compared.

关键词： Convolutional Neural Network Trefoil Phase Mask Extended Depth of Field Deblurring wavefront coding

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Deep-focus compound-eye camera with polarization filters for 3D endoscopes

Deep-focus compound-eye camera with polarization filters for...

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

作者： Kagawa, Keiichiro Tanaka, Eiji Yamada, Kenji Kawahito, Shoji Tanida, Jun Shizuoka Univ Naka Ku 3-5-1 Johoku Hamamatsu Shizuoka 4328011 Japan Panasonic Elect Devices Co Ltd Kyoto 6100343 Japan Osaka Univ Suita Osaka 5650871 Japan

ISBN: (纸本)9780819488701

A deep-focus three-dimensional endoscope based on a compact compound-eye camera called TOMBO (thin observation module by bound optics) with polarization filters and polarized illuminations is presented. TOMBO is a very compact multi-camera system, which is composed of a single image sensor, a lens array, and a crosstalk barrier. Features of TOMBO are compactness of the camera system, and additional functionality achieved by attaching optical filters to lenses. In this paper, to enhance surface or deep structures of biological tissues selectively, polarization filters, which are parallel and vertical to the polarized illumination, respectively, are attached to a part of lenses. To achieve extended depth of focus, a wavefront coding (WFC) technique based on the spherical aberration is introduced. A prototype TOMBO with 3x3 lenses and a 2.2-mu m-pixel color CMOS image sensor was fabricated. Depth estimation and super-resolution with the WFC technique are demonstrated. Enhancement of surface or deep structures is also verified theoretically and experimentally.

关键词： Endoscope compound-eye camera wavefront coding polarization

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Optical implementation of cubic-phase distribution lenses for passive infrared motion sensors

Optical implementation of cubic-phase distribution lenses fo...

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Conference on Thermosense XXVI

作者： Cirino, GA Neto, LG Mansano, RD ElectroPPAr Ind Eletron Ltda BR-17400000 Garca SP Brazil

ISBN: (纸本)0819453285

A cubic-phase distribution is applied in the design and fabrication of inexpensive lenses for passive infrared motion sensors. The resulting lenses produce a point spread function (PSF) capable to distinguish the presence of humans from pets by the employment of the so-called wavefront coding method. The cubic phase distribution used in the design can also reduce the optical aberrations present on the system. This aberration control allows a low tolerance in the fabrication of the lenses and in the alignment errors of the sensor. The lens was manufactured on amorphous hydrogenated carbon thin film, by employing well-known micro fabrication process steps. The optical results demonstrates that the optical power falling onto the detector surface is attenuated for targets that present a mass that is horizontally distributed in space (e.g. pets) while the optical power is enhanced for targets that present a mass vertically distributed in space (e.g. humans).

关键词： passive infrared sensor pyroelectric detector cubic phase distribution wavefront coding diamond-like carbon (DLC) thin film

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Engineering the pupil phase to improve image quality

Engineering the pupil phase to improve image quality

引用

Conference on Visual Information Processing XII

作者： Prasad, S Torgersen, TC Pauca, VP Plemmons, RJ van der Gracht, J Univ New Mexico Ctr Adv Studies Albuquerque NM 87131 USA

ISBN: (纸本)0819449687

By suitably phase-encoding optical images in the pupil plane and then digitally restoring them, one can greatly improve their quality. The use of a cubic phase mask originated by Dowski and Cathey to enhance the depth of focus in the images of 3-d scenes is a classic example of this powerful approach. By using the Strehl ratio as a measure of image quality we propose tailoring the pupil phase profile by minimizing the sensitivity of the quality of the phase-encoded image of a point source to both its lateral and longitudinal coordinates. Our approach ensures that, the encoded image will be formed under a nearly shift-invariant imaging condition, which can then be digitally restored to a high overall quality, nearly free from the aberrations and limited depth of focus of a traditional imaging system. We also introduce an alternative measure of sensitivity that is based on the concept of Fisher information. In order to demonstrate the validity of our general approach, we present results of computer simulations that include the limitations imposed by detector noise.

关键词： pupil-phase mask wavefront coding integrated imaging Strehl ratio Fisher information focus extension image quality nonlinear optimization

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Potential performance loss and compensation techniques of a lens under ionizing radiations 7

Potential performance loss and compensation techniques of a ...

引用

Conference on Optical Design and Engineering VII

作者： Muller, C. Lepine, T. Allanche, T. Boukenter, A. Paillet, P. Girard, S. Ouerdane, Y. CEA French Alternat Energies & Atom Commiss DAM DIF F-91297 Arpajon France Univ Lyon Lab Hubert Curien CNRS UMR 5516 18 Rue Benoit Lauras F-42000 St Etienne France Grad Sch Inst Opt 18 Rue Benoit Lauras F-42000 St Etienne France

ISBN: (数字)9781510619180

ISBN: (纸本)9781510619180

Our goal is to design a radiation resistant camera lens for color imaging capable to withstand ionizing radiations up to total doses of a few MGy. The latter cause damages in the internal structure of glass which can affect its optical transmission and refractive index (RI). On the one hand, the radiation-induced attenuation (RIA) mainly causes the glass darkening and image signal-to-noise ratio degradation and can be partially handled by choosing the most appropriate materials. On the other hand, the radiation-induced RI change (RIRIC) causes the blurring of the image which can be more harmful to the viewing applications. Indeed, typical RIRIC magnitudes of 10(-4) to 10(-3) mainly induce defocus on the image. Yet, no motorized elements have been shown to be resistant to radiations at the aimed dose levels. Similarly to thermal defocus in non-cooled thermal imaging, the impact of the RIRIC has to be studied during the design step of the camera lens. However, until comprehensive measurements on different glasses and under different types of radiations, the easiest way to foresee the lens behavior with respect to the RIRIC is to perform a parametric study of its response. We studied RIA and RIRIC effects on a dummy lens and show that a self-compensation of the lenses RI changes appears as possible. As this problem is very similar to the constraint of increased depth of field, we also studied the technique of wavefront coding to increase the lens tolerance to RIRIC.

关键词： radiation damages optical system attenuation refractive index wavefront coding

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