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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Prathamesh Kulkarni Diana Lozano George Zouridakis Michael Twa Electrical and Computer Engineering University of Houston University of Houston College of Optometry Engineering Technology Computer Science and Electrical and Computer Engineering University of Houston

ISBN: (纸本)9781424441211

Optical coherence tomography (OCT) is an important mode of biomedical imaging for the diagnosis and management of ocular disease. Here we report on the construction of a synthetic retinal OCT image data set that may be used for quantitative analysis of image processing methods. Synthetic image data were generated from statistical characteristics of real images (n = 14). Features include: multiple stratified layers with representative thickness, boundary gradients, contour, and intensity distributions derived from real data. The synthetic data also include retinal vasculature with typical signal obscuration beneath vessels. This synthetic retinal image can provide a realistic simulated data set to help quantify the performance of image processing algorithms.

关键词： optical coherence tomography statistical models (nuclear) image data Retinaldehyde image processing algorithm simulated data image analysis QUANTITATIVE ANALYSIS

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Methodology to distinguish features in complex and congested underwater environments

Methodology to distinguish features in complex and congested...

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作者： Matthew Arthur Mitchelson Naval Postgraduate School

学位级别：硕士

The underwater community involves researchers who conduct various work and experiments below the surface of Earth's oceans. Today's high-frequency sonar limitations do not provide sufficient information for the underwater community. There is a pressing need to increase the accuracy of detection, identify items detected and obtain knowledge of missing details. Currently, no standard methodology exists to evaluate the accuracy and completeness of sonar and detection algorithms; this is critical because both are required to use sonar effectively. Such a methodology is required for the evaluation and comparison of sensors and algorithms. This research investigated a proposed methodology to evaluate effectively underwater perception in complex underwater environments. This methodology considered the challenges of underwater localization and other design factors during the use of a mobile au- tonomous underwater vehicle and high-frequency sonar, and the employment of underwater signal and image processing techniques. The focus of this research and contribution to the underwater community is an initial robust methodology the underwater community may use to obtain relevant data sets. Furthermore, researchers can apply those data sets to custom perceptors and algorithms, and evaluate whether or not these custom methods are capable of detecting the known features while quantifying the missed features. Ultimately, the results of the signal and image processing, compared to the defined ground truth, demonstrated that the use of the high-frequency sonar was not capable in distinguishing all smaller features and gaps between underwater structures.

关键词： enhanced methodology acoustic baseline autonomous underwater vehicle image processing algorithm high-frequency sonar

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BEYOND THE KODAK image SET: A NEW REFERENCE SET OF COLOR image SEQUENCES

BEYOND THE KODAK IMAGE SET: A NEW REFERENCE SET OF COLOR IMA...

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IEEE International Conference on image processing

作者： Stefano Andriani Harald Brendel Tamara Seybold Joseph Goldstone ARRI - Arnold and Richter Cine Technik GmbH Image Science Group R&D Department Türkenstra?e 89 80799 Munich Germany

ISBN: (纸本)9781479923427

In 1991 Kodak released a set of 24 digital color images derived from a variety of film source materials. Since then, most image processing algorithms have been developed, optimized, tested and compared using this set. Until a few years ago it was considered "the" image set;however, today it shows its limitations. Researches have expressed their need for better, more up-to-date material. We present a new set of high quality color image sequences captured with our professional digital cinema camera. This camera stores uncompressed raw sensor data and the set is freely available for FTP at password: image set.

关键词： Kodak set ARRI set sensor data color demo-saicking Sensor Data images color image file transfer protocol formycin triphosphate image processing algorithm image set Color

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A Statistical Measure for Fatigue Induced Degradation in Metal Layers

A Statistical Measure for Fatigue Induced Degradation in Met...

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作者： Dzenana Alagic Alpen-Adria Universitat Klagenfurt

学位级别：硕士

In semiconductor industry it is necessary to test devices at different electro-thermal load conditions in order to detect possible weaknesses in design and functionality as soon as possible. To reduce the testing time, often accelerated stress tests are used. The repetitive applied stress during accelerated lifetime tests causes visible signs of damage in the devices, which in the worst case triggers device failure. The focus of this work lies in the description of the damage propagation in a metal layer of interest by means of scanning acoustic microscopy images. To automatically quantify and measure the damage in these images, two image processing algorithms are developed. For this purpose, the image processing software imageJ is used. The algorithms can be applied on different types of devices providing robust and easily interpretable results. To model the amount of the damaged area in the metal layer dependent on the load condition, beta regression models are applied. For the development of the model, the betareg package of the statistical program R is used. In this work, two types of beta regression models are considered. The so-called basic beta regression model models the mean of the response, but assumes a constant precision parameter. The so-called variable dispersion model models both, the mean and the precision parameter. Different model set ups are compared based on goodness-of-fit criteria, where in the end the variable dispersion model is chosen as it provides the most accurate results. The results show that the information about the damage in the metal layer extracted from the scanning acoustic microscopy images by image processing techniques is physically plausible. It can be modeled with a beta regression model based on a physically meaningful set of covariates and also predictions for a new set of images can be made.

关键词： Semiconductor Devices Scanning Acoustic Microscopy images imageJ image processing algorithm Damage Quantification Beta Regression Model Variable Dispersion Model Goodness-of-Fit Testing

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Assessment of milk fermentation process at three temperatures using laser speckle technique

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LASER PHYSICS 2022年第4期32卷 045602-045602页

作者： Koley, Chhanda Nirala, Anil Kumar Indian Inst Technol Indian Sch Mines Dhanbad Dept Phys Biomed Opt Lab Dhanbad Jharkhand India

This research work contains information on speckle activity at different stages of the milk fermentation process at temperatures of 24 degrees C, 32 degrees C and 40 degrees C, using the dynamic laser speckle technique for the first time, to the best of our knowledge. image processing algorithms such as inertia moment (IM), the absolute value of differences, the probability mass function of regular difference, spatial-temporal speckle correlation and 3D graphs of spectral images have been applied to show the speckle activity of the samples. All the methods show that the speckle activity of the sample is higher at the semisolid stage than at the liquid stage of the sample. Also, higher speckle activity of the curd has been observed at 40 degrees C (11 576.18 using IM) than at 32 degrees C (8550.92 using IM), followed by that at 24 degrees C (4855.88 using IM). At 40 degrees C, the thermal motion of curd particles is higher than that of the curd particles at the other two temperatures, and are responsible for the higher speckle activity. The preparation time for curd at 40 degrees C (5 h) is lower in comparison to the curds at 24 degrees C (10 h) and 32 degrees C (6 h). The lowest value for the titratable acidity of the curd prepared at 24 degrees C shows a lower % lactic acid than the curd at 32 degrees C and that at 40 degrees C. The lowest value of susceptibility to syneresis of the curd at 40 degrees C (30.00) represents a more compact curd than the curds at 32 degrees C (37.50) and 24 degrees C (45.00). The horizontal speckle grain size of the curd has been calculated using an autocovariance function;the highest is for curd fermented at 40 degrees C (12.34 mu m), followed by that at 32 degrees C (11.59 mu m), then that at 24 degrees C (10.96 mu m).

关键词： laser speckle image processing algorithm milk fermentation curd

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Optically monitored segmented flow for controlled ultra-fast mixing and nanoparticle precipitation

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MICROFLUIDICS AND NANOFLUIDICS 2017年第12期21卷 179-179页

作者： Erfle, Peer Riewe, Juliane Bunjes, Heike Dietzel, Andreas TU Braunschweig Inst Microtechnol Alte Salzdahlumer Str 203 D-38124 Braunschweig Germany TU Braunschweig Inst Pharmazeut Technol Mendelssohnstr 1 D-38106 Braunschweig Germany TU Braunschweig PVZ Ctr Pharmaceut Engn Franz List Str 35 A D-38106 Braunschweig ME Germany

Nanoparticles of drugs or colloidal carrier systems are capable of providing substantial advantages for drug bioavailability, but manufacturing nanoparticulate drugs or drug carriers remains a challenge because traditional mechanical or chemical batch mode processes might lack precise control of nanoparticle sizes. Microfluidic approaches are believed to give advantages but often do not provide chemically inert environments and lack controllable operation. Here, segmented flow devices with symmetrical design for centered organic phase injection and for nanoparticle precipitation in transparent and chemically inert glass microchannels are presented. Femtosecond laser fabrication was used to structure borosilicate glass wafers with hydrophilic microchannels of nearly circular cross section. They allow for ultra-fast mixing of solvents with aqueous fluids and subsequent precipitation of poorly water soluble drug nanoparticles or colloidal carrier particles. The best results for mixing and controlled precipitation were obtained with flow focusing and gas segmentation occurring at the same channel intersection point. In such systems, early interdiffusion of the solvent and aqueous solution before ultra-fast convective mixing in the plug is suppressed. A novel optical analysis technique revealed that the speed of mixing can be well controlled by simply adjusting the volume flow rate of the gas phase where changes in the liquid flow rate have practically no influence. In a controlled and stable Taylor flow, smallest plug volumes of 3.8 nl can be generated, which allows complete mixing in 9 ms. The production of lipid nanoparticles down to a diameter of 74 nm could already be demonstrated.

关键词： Microfluidic Taylor flow Mixing image processing algorithm Precipitation Lipid nanoparticles

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An ensemble method for nuclei detection of overlapping cervical cells

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EXPERT SYSTEMS WITH APPLICATIONS 2021年 185卷 115642-115642页

作者： Diniz, Debora Nasser Vitor, Rafael Ferreira Campos Bianchi, Andrea Gomes Delabrida, Saul Carneiro, Claudia Martins Ushizima, Daniela Mayumi Sombra de Medeiros, Fatima Nelsizeuma Freitas Souza, Marcone Jamilson Univ Fed Ouro Preto UFOP Dept Comp BR-35400000 Ouro Preto MG Brazil Univ Fed Ouro Preto UFOP Dept Anal Clin BR-35400000 Ouro Preto MG Brazil Lawrence Berkeley Natl Lab Computat Res Div Berkeley CA 94720 USA Univ Fed Ceara UFC Dept Engn Teleinformat BR-60455970 Fortaleza Ceara Brazil

The Pap test is a preventive approach that requires specialized and labor-intensive examination of cytological preparations to track potentially cancerous cells from the internal and external cervix surface. A cytopathologist must analyze many microscopic fields while screening for abnormal cells. Therefore there is hope that a support decision system could assist with clinical diagnosis, for example, by identifying sub-cellular abnormalities, such as changes in the nuclei features. This work proposes an ensemble method for cervical nuclei detection aiming to reduce the workload of cytopathologists. First, a preprocessing phase divides the original image into superpixels, which are input to feature extraction and selection algorithms. The proposed ensemble method combines three classifiers: Decision Tree (DT), Nearest Centroid (NC), and k-Nearest Neighbors (kNN), which are evaluated against the ISBI'14 Overlapping Cervical Cytology image Segmentation Challenge dataset. Experiments show that the proposed method is the state-of-the-art algorithm of the literature for recall (0.999) and F1 values (0.993). It produced a recall very close to the optimum value and also kept high precision (0.988).

关键词： Ensemble methods image processing algorithm Detection approach Cervical cancer Pap smear test

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Parsing Netlists of Integrated Circuits from images via Graph Attention Network

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SENSORS 2024年第1期24卷 227-227页

作者： Hu, Wenxing Zhan, Xianke Tong, Minglei Shanghai Univ Elect Power Coll Elect & Informat Engn Shanghai 200082 Peoples R China

A massive number of paper documents that include important information such as circuit schematics can be converted into digital documents by optical sensors like scanners or digital cameras. However, extracting the netlists of analog circuits from digital documents is an exceptionally challenging task. This process aids enterprises in digitizing paper-based circuit diagrams, enabling the reuse of analog circuit designs and the automatic generation of datasets required for intelligent design models in this domain. This paper introduces a bottom-up graph encoding model aimed at automatically parsing the circuit topology of analog integrated circuits from images. The model comprises an improved electronic component detection network based on the Swin Transformer, an algorithm for component port localization, and a graph encoding model. The objective of the detection network is to accurately identify component positions and types, followed by automatic dataset generation through port localization, and finally, utilizing the graph encoding model to predict potential connections between circuit components. To validate the model's performance, we annotated an electronic component detection dataset and a circuit diagram dataset, comprising 1200 and 3552 training samples, respectively. Detailed experimentation results demonstrate the superiority of our proposed enhanced algorithm over comparative algorithms across custom and public datasets. Furthermore, our proposed port localization algorithm significantly accelerates the annotation speed of circuit diagram datasets.

关键词： object detection deep learning graph convolutional neural network image processing algorithm link prediction

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In situ observation and understanding of the arc erosion behavior of electrical contact materials

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MATERIALS TESTING 2023年第11期65卷 1696-1706页

作者： Zhang, Chao Ren, Wanbin Zheng, Zhe Liu, Jian Liu, Xiujie Harbin Inst Technol Sch Elect Engn & Automat Harbin 150001 Heilongjiang Peoples R China Harbin Inst Technol Sch Instrumentat Sci & Engneering Harbin 150001 Heilongjiang Peoples R China Harbin Inst Technol Sch Int Studies Harbin 150001 Heilongjiang Peoples R China

Arc erosion studies are carried out on electrical contact materials in the switching current experiment. A test rig is developed to capture the 2-D image and the 3-D profile of eroded silver tin oxide electrical contact material in situ. image processing algorithms are specially presented to accurately recognize the features of erosion region. The initial small patch of erosion traces gradually evolves into the deep crater with the increment of switching cycle enabling a study of the arc erosion behavior. 2-D image, 3-D profile, and micro surface morphologies of the eroded contacts are analyzed and then related to the extent of erosion. The results show that the evolution process of central erosion region could be divided into the enlargement in breadth of contact surface and the extension in depth of contact profile. The end result of arc erosion is the net loss of contact material, which would lead to the substantial reduction of contact force and potential electrical contact instability.

关键词： arc erosion electrical contact image processing algorithm in situ observation surface morphology

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Sources of variation in Affymetrix microarray experiments

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BMC BIOINFORMATICS 2005年第1期6卷 214-214页

作者： Zakharkin, SO Kim, K Mehta, T Chen, L Barnes, S Scheirer, KE Parrish, RS Allison, DB Page, GP Univ Alabama Birmingham Sect Stat Genet Birmingham AL 35294 USA Univ Alabama Birmingham Dept Pharmacol Birmingham AL 35294 USA Univ Alabama Birmingham Dept Toxicol Birmingham AL 35294 USA Univ Alabama Birmingham Heflin Ctr Human Genet Birmingham AL 35294 USA Univ Louisville Dept Bioinformat & Biostat Louisville KY 40292 USA

Background: A typical microarray experiment has many sources of variation which can be attributed to biological and technical causes. Identifying sources of variation and assessing their magnitude, among other factors, are important for optimal experimental design. The objectives of this study were: (1) to estimate relative magnitudes of different sources of variation and (2) to evaluate agreement between biological and technical replicates. Results: We performed a microarray experiment using a total of 24 Affymetrix GeneChip (R) arrays. The study included 4th mammary gland samples from eight 21-day-old Sprague Dawley CD female rats exposed to genistein (soy isoflavone). RNA samples from each rat were split to assess variation arising at labeling and hybridization steps. A general linear model was used to estimate variance components. Pearson correlations were computed to evaluate agreement between technical and biological replicates. Conclusion: The greatest source of variation was biological variation, followed by residual error, and finally variation due to labeling when *.cel files were processed with dChip and RMA image processing algorithms. When MAS 5.0 or GCRMA-EB were used, the greatest source of variation was residual error, followed by biology and labeling. Correlations between technical replicates were consistently higher than between biological replicates.

关键词： Genistein Residual Error Microarray Experiment Affymetrix GeneChip image processing algorithm

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