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Sequential filtering for color image acquisition

OPTICS EXPRESS 2014年第22期22卷 26878-26883页

作者： Raz, Ariel Mendlovic, David Tel Aviv Univ Fac Engn Dept Phys Elect IL-69978 Tel Aviv Israel

We present an alternative method of color imaging. It utilizes a single standard Si-based image sensor and a clear aperture, tunable, color filter. Within this scheme, three monochromatic frames are taken;each is acquired with a single color and with a fraction of the total acquisition duration. This scheme offers several advantages compared to standard Bayer-demosaicing schemes. Among them - significantly higher resolution, flexibility in exposure durations, improved noise performance and in sum better image quality. This paper presents both color filter design and the adjusted image pipeline. Lastly, the proposed imaging scheme and the Bayer scheme are compared in terms of MSE. (C)2014 Optical Society of America

关键词： image fusion image processing algorithms image quality image resolution Imaging systems Liquid crystal filters

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Bacteria identification in an optical system with optimized diffraction pattern registration condition supported by enhanced statistical analysis

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OPTICS EXPRESS 2014年第21期22卷 26312-26327页

作者： Suchwalko, Agnieszka Buzalewicz, Igor Podbielska, Halina Wroclaw Univ Technol Inst Biomed Engn & Instrumentat Bioopt Grp PL-50370 Wroclaw Poland AVL SP Zoo PL-55200 Olawa Poland

It is possible to identify bacteria species basing on their diffraction patterns followed by statistical analysis. The new approach exploits two steps: optimization of the recording conditions and introduction of new interpretable features for the identification. First, optimal diffraction registration plane, was determined. Next, results were verified by the analysis workflow based on ANOVA and Fisher divergence for feature selection, QDA and SVM models for classification and identification and CV with stratified sampling, sensitivity and specificity for performance assessment of the identification process. The proposed approach resulted in high sensitivity 0.9759 and specificity 0.9903 with very small identification error 1.34%. (C) 2014 Optical Society of America

关键词： Fresnel diffraction Holographic microscopy image processing algorithms Light diffraction Optical properties Ptychography

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itom: an open source metrology, automation, and data evaluation software

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APPLIED OPTICS 2014年第14期53卷 2974-2982页

作者： Gronle, Marc Lyda, Wolfram Wilke, Marc Kohler, Christian Osten, Wolfgang Univ Stuttgart Inst Tech Opt Stuttgart Res Ctr Photon Engn SCoPE D-70569 Stuttgart Germany Twip Opt Solut GmbH D-70569 Stuttgart Germany

Modern optical sensors and measurement systems usually are a powerful combination of optical elements, active hardware components like actuators or sensing devices as well as a sophisticated control software and data evaluation algorithms. In order to develop and operate such systems, it is necessary to have a flexible, intuitive, and fast underlying software framework that also allows for rapid prototyping of a sensor in a dynamic lab environment. This software must be able to control and communicate with all necessary hardware devices and has to provide all the highly performant evaluation, data, and image processing algorithms required. In this publication, we want to present the open source measurement and data evaluation software suite itom, which has been designed considering the denoted requirements and whose development began in 2011. (c) 2014 Optical Society of America

关键词： Fringe projection image processing image processing algorithms Optical elements Optical measurement Scanning probe microscopy

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Principal-vector-directed fringe-tracking technique

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APPLIED OPTICS 2014年第31期53卷 7381-7393页

作者： Zhang, Zhihui Guo, Hongwei Shanghai Univ Dept Precis Mech Engn Lab Appl Opt & Metrol Shanghai 200072 Peoples R China

Fringe tracking is one of the most straightforward techniques for analyzing a single fringe pattern. This work presents a principal-vector-directed fringe-tracking technique. It uses Gaussian derivatives for estimating fringe gradients and uses hysteresis thresholding for segmenting singular points, thus improving the principal component analysis method. Using it allows us to estimate the principal vectors of fringes from a pattern with high noise. The fringe-tracking procedure is directed by these principal vectors, so that erroneous results induced by noise and other error-inducing factors are avoided. At the same time, the singular point regions of the fringe pattern are identified automatically. Using them allows us to determine paths through which the "seed" point for each fringe skeleton is easy to find, thus alleviating the computational burden in processing the fringe pattern. The results of a numerical simulation and experiment demonstrate this method to be valid. (C) 2014 Optical Society of America

关键词： Analytical techniques Digital image processing Fourier transforms Fringe analysis image processing algorithms Numerical simulation

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Integral image rendering procedure for aberration correction and size measurement

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APPLIED OPTICS 2014年第15期53卷 3176-3182页

作者： Sommer, Holger Ihrig, Andreas Ebenau, Melanie Fluehs, Dirk Spaan, Bernhard Eichmann, Marion Tech Univ Dortmund Fak Phys D-44221 Dortmund Germany Univ Klinikum Essen Klin Strahlenphys D-45122 Essen Germany

The challenge in rendering integral images is to use as much information preserved by the light field as possible to reconstruct a captured scene in a three- dimensional way. We propose a rendering algorithm based on the projection of rays through a detailed simulation of the optical path, considering all the physical properties and locations of the optical elements. The rendered images contain information about the correct size of imaged objects without the need to calibrate the imaging device. Additionally, aberrations of the optical system may be corrected, depending on the setup of the integral imaging device. We show simulation data that illustrates the aberration correction ability and experimental data from our plenoptic camera, which illustrates the capability of our proposed algorithm to measure size and distance. We believe this rendering procedure will be useful in the future for three-dimensional ophthalmic imaging of the human retina. (C) 2014 Optical Society of America

关键词： image processing algorithms image quality Light fields Medical imaging Optical aberrations Three dimensional imaging

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image reconstruction for structured-illumination microscopy with low signal level

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OPTICS EXPRESS 2014年第7期22卷 8687-8702页

作者： Chu, Kaiqin McMillan, Paul J. Smith, Zachary J. Yin, Jie Atkins, Jeniffer Goodwin, Paul Wachsmann-Hogiu, Sebastian Lane, Stephen Univ Calif Davis Ctr Biophoton Sacramento CA 95817 USA Univ Melbourne Melbourne Vic 3010 Australia Appl Precis Issaquah WA 98027 USA Univ Calif Davis Dept Pathol & Lab Med Sacramento CA 95817 USA

We report a new image processing technique for the structured illumination microscopy designed to work with low signals, with the goal of reducing photobleaching and phototoxicity of the sample. Using a pre-filtering process to estimate experimental parameters and total variation as a constraint to reconstruct, we obtain two orders of magnitude of exposure reduction while maintaining the resolution improvement and image quality compared to a standard structured illumination microscopy. The algorithm is validated on both fixed and live cell data with results confirming that we can image more than 15x more time points compared to the standard technique. (C) 2014 Optical Society of America

关键词： Illumination design image processing algorithms image quality image reconstruction Optical transfer functions Spatial light modulators

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Smearing model and restoration of star image under conditions of variable angular velocity and long exposure time

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OPTICS EXPRESS 2014年第5期22卷 6009-6024页

作者： Sun, Ting Xing, Fei You, Zheng Wang, Xiaochu Li, Bin Tsinghua Univ Dept Precis Instrument Beijing 100084 Peoples R China Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China Tsinghua Univ Collaborat Innovat Ctr Micro Nano Fabricat Device Beijing 100084 Peoples R China

The star tracker is one of the most promising attitude measurement devices widely used in spacecraft for its high accuracy. High dynamic performance is becoming its major restriction, and requires immediate focus and promotion. A star image restoration approach based on the motion degradation model of variable angular velocity is proposed in this paper. This method can overcome the problem of energy dispersion and signal to noise ratio (SNR) decrease resulting from the smearing of the star spot, thus preventing failed extraction and decreased star centroid accuracy. Simulations and laboratory experiments are conducted to verify the proposed methods. The restoration results demonstrate that the described method can recover the star spot from a long motion trail to the shape of Gaussian distribution under the conditions of variable angular velocity and long exposure time. The energy of the star spot can be concentrated to ensure high SNR and high position accuracy. These features are crucial to the subsequent star extraction and the whole performance of the star tracker. (C)2014 Optical Society of America

关键词： Dispersion image processing image processing algorithms image restoration image sensors Point spread function

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Automated detection of remineralization in simulated enamel lesions with PS-OCT

Automated detection of remineralization in simulated enamel ...

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Conference on Lasers in Dentistry XX

作者： Lee, Robert C. Darling, Cynthia L. Fried, Daniel Univ Calif San Francisco San Francisco CA 94143 USA

ISBN: (纸本)9780819498427

Previous in vitro and in vivo studies have demonstrated that polarization-sensitive optical coherence tomography (PS-OCT) can be used to nondestructively image the subsurface structure and measure the thickness of the highly mineralized transparent surface zone of caries lesions. There are structural differences between active lesions and arrested lesions, and the surface layer thickness may correlate with activity of the lesion. The purpose of this study was to develop a method that can be used to automatically detect and measure the thickness of the transparent surface layer in PS-OCT images. Automated methods of analysis were used to measure the thickness of the transparent layer and the depth of the bovine enamel lesions produced using simulated caries models that emulate demineralization in the mouth. The transparent layer thickness measured with PS-OCT correlated well with polarization light microscopy (PLM) measurements of all regions (r(2)=0.9213). This study demonstrates that PS-OCT can automatically detect and measure thickness of the transparent layer formed due to remineralization in simulated caries lesions.

关键词： Enamel caries PS-OCT image processing algorithms edge-detection remineralization

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Line Estimation using the Viterbi Algorithm and Track-Before-Detect Approach for Line Following Mobile Robots 19

Line Estimation using the Viterbi Algorithm and Track-Before...

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19th International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Mazurek, Przemyslaw West Pomeranian Univ Technol Szczecin Dept Signal Proc & Multimedia Engn PL-71126 Szczecin Poland

ISBN: (纸本)9781479950812

Line following robots requires image acquisition and processing algorithms for the determination of the line trajectory. The Viterbi algorithm is proposed for the estimation of the line trajectory in this paper. The robustness of this algorithm is verified using the Monte Carlo approach for two distortions types: additive Gaussian noise and false lines sets. The results show possibilities of reliable estimation, even if the real line is hidden in the noise, without the application of additional estimators based on the previous measurements.

关键词： Gaussian noise Monte Carlo methods maximum likelihood estimation mobile robots object detection object tracking path planning robot vision Monte Carlo approach Viterbi algorithm additive Gaussian noise false line sets image acquisition algorithms image processing algorithms line estimation line following mobile robots line trajectory estimation track-before-detect approach Estimation Mobile robots Noise Trajectory Viterbi algorithm Mobile robots Monte Carlo technique Gaussian noise robot vision image processing algorithm trajectory Object detection Path planning maximum likelihood estimation Noise

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VIMARSHAK - A Web Based Subjective image Evaluation System

VIMARSHAK - A Web Based Subjective Image Evaluation System

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5th International Conference on Signal and image processing (ICSIP)

作者： Garg, Gazal Mondal, Prasenjit Aswatha, Shashaank M. Mukherjee, Jit Maji, Tapas Mukherjee, Jayanta Indian Inst Technol Dept Comp Sci & Engn Kharagpur 721302 W Bengal India

ISBN: (纸本)9780769551005

In this paper, a secured web based online subjective image evaluation system has been proposed to assess different image processing algorithms. Since many image processing algorithms are designed to enhance the human perception of available image cues, subjective evaluation plays an important role in the assessment of the same. The proposed technique assesses several similar processes by accumulation of votes by individual human evaluators through pairwise comparisons of their outputs. Three tournament strategies are used for the pairwise image comparisons, namely knockout, challenging, and round-robin. The experiments show a satisfactory result in evaluation of accumulated ensemble of evaluators' votes, which is validated using Berkeley boundary detection benchmark dataset.

关键词： Internet edge detection image processing Berkeley boundary detection VIMARSHAK Web based online subjective image evaluation system human perception image cues image processing algorithms pairwise image comparisons Algorithm design and analysis Databases Electronic mail Games image quality Security Subjective perception online evaluation system tournament strategies

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