Filters








286 Hits in 4.7 sec

Quantitative description of 3D vascularity images: texture-based approach and its verification through cluster analysis

Artur Klepaczko, Marek Kociński, Andrzej Materka
2010 Pattern Analysis and Applications  
tree images.  ...  Through the use of cluster analysis, it confirms the correspondence between texture descriptors and various vessel system parameters, such as blood viscosity and the number of tree branches.  ...  the original author(s) and source are credited.  ... 
doi:10.1007/s10044-010-0192-8 fatcat:a4kycftddfcoxfcfksgcxzdd7i

Transformation in Scale for Continuous Zooming [chapter]

Zhilin Li, Haowen Yan
2019 Manual of Digital Earth  
It also discusses the mathematical solutions to transformations in scale (including upscaling and downscaling) for both raster (numerical and categorical data) and vector (point set data, line data set  ...  It introduces the basic concepts of and issues in continuous zooming and transformation in scale (or multiscale transformation).  ...  Then, models for such transformations were described in Sect. 8.3 for raster and vector data, images, digital terrain models and map data.  ... 
doi:10.1007/978-981-32-9915-3_8 fatcat:eirn2x5bk5gvnfcp2bk6f2arla

Parametric description of a scan-display system

Lawrence A. Dunn, Lakshmi N. Goyal, Bruce H. McCormick, Val G. Tareski
1969 Proceedings of the May 14-16, 1969, spring joint computer conference on XX - AFIPS '69 (Spring)  
When video participates as a source medium the role is reversed and one always gets the inverse transformation to the 8-M-V control grid.  ...  SUMMARY This paper has developed the parametric description of a general purpose Scan/Display System for image digitization and display.  ... 
doi:10.1145/1476793.1476826 dblp:conf/afips/DunnGMT69 fatcat:rtyyf2tehff7nc224a2vxtqxkm

Binary Morphology With Spatially Variant Structuring Elements: Algorithm and Architecture

H. Hedberg, P. Dokladal, V. Owall
2009 IEEE Transactions on Image Processing  
These properties make this algorithm useful in both software and hardware implementations, not only for spatially variant, but also translation-invariant morphology.  ...  Mathematical morphology with spatially variant structuring elements outperforms translation-invariant structuring elements in various applications and has been studied in the literature over the years.  ...  ALGORITHM DESCRIPTION The algorithm reads the input image and writes the output image sequentially in raster scan order. Let denote the current reading and current writing position.  ... 
doi:10.1109/tip.2008.2010108 pmid:19211332 fatcat:ownwihoiu5fuzndsrayjrzzepy

3D Magnetic Field Reconstruction Methodology Based on a Scanning Magnetoresistive Probe

Filipe Richheimer, Margaret Costa, Diana Leitao, João Gaspar, Susana Cardoso, Paulo Freitas
2018 Sensors  
field components by use of the analytical coordinate transform equations.  ...  The present work provides a detailed description on quantitative 3D magnetic field reconstruction using a scanning magnetoresistance microscopy setup incorporating a 19.5 µm × 2.5 µm magnetoresistive sensor  ...  by application of the inverse problem for fault detection in 3D stacked electronics [10] .  ... 
doi:10.3390/s18072049 pmid:29954089 pmcid:PMC6069358 fatcat:eltun7caazdavjfz7ckkrzzwpm

OCT angiography by absolute intensity difference applied to normal and diseased human retinas

Daniel Ruminski, Bartosz L. Sikorski, Danuta Bukowska, Maciej Szkulmowski, Krzysztof Krawiec, Grazyna Malukiewicz, Lech Bieganowski, Maciej Wojtkowski
2015 Biomedical Optics Express  
healthy eyes and eyes with diabetic maculopathy and branch retinal vein occlusion.  ...  We perform phantom studies to investigate contrast-to-noise ratio for angiographic images obtained with each of the algorithm.  ...  Additional averaging for SV, AID and ACD analysis improves their contrast significantly (CNR S/N2 ) between flow and background noise areas in all of these methods (Fig. 2(c) dashed lines).  ... 
doi:10.1364/boe.6.002738 pmid:26309740 pmcid:PMC4541504 fatcat:usd5gsufebclplvnfeuzfhus5i

An Entropy-Weighting Method for Efficient Power-Line Feature Evaluation and Extraction from LiDAR Point Clouds

Junxiang Tan, Haojie Zhao, Ronghao Yang, Hua Liu, Shaoda Li, Jianfei Liu
2021 Remote Sensing  
Six significant features are selected (Height above Ground Surface (HGS), Vertical Range Ratio (VRR), Horizontal Angle (HA), Surface Variation (SV), Linearity (LI) and Curvature Change (CC)), and then  ...  To decrease the interference from pylon points, this paper analyzes performance in different pylon situations and performs an adaptive weight transformation.  ...  Acknowledgments: We would like to thank Chengdu Alundar Technology, China, and Wuhan Rgspace Technology, China, for providing the experimental data and to thank the anonymous reviewers for their valuable  ... 
doi:10.3390/rs13173446 fatcat:b6sdbdo5obd5pia3vpqhx3gnia

Maximum A Posteriori Signal Recovery forOptical Coherence Tomography AngiographyImage Generation and Denoising

Lennart Husvogt, Stefan Ploner, Siyu Chen, Daniel Stromer, Julia Schottenhamml, Yasin Alibhai, Eric Moult, Nadja Waheed, James Fujimoto, Andreas Maier
2020 Biomedical Optics Express  
Optical coherence tomography angiography (OCTA) is a novel and clinically promising imaging modality to image retinal and sub-retinal vasculature.  ...  The presented algorithm brings together OCTA image generation and Bayesian statistics and can be developed into new OCTA image generation and denoising algorithms.  ...  The motion correction algorithm requires at least two OCT volumes which were raster-scanned with orthogonal fast-scan directions.  ... 
doi:10.1364/boe.408903 pmid:33520377 pmcid:PMC7818957 fatcat:rjmake3mq5a5lk3bmaxxoneya4

Eye-safe digital 3-D sensing for space applications

J.-A. Beraldin
2000 Optical Engineering: The Journal of SPIE  
The major advantages of the LARS over conventional video-based imaging are its ability to operate with sunlight shining directly into the scanner and its immunity to spurious reflections and shadows, which  ...  The raster mode is used primarily for the measurement of registered range and intensity information on large stationary objects.  ...  We would like to thank the people at Neptec Design Group ͑Canada͒ and NASA for their logistical support throughout the work on the ODS at KSC.  ... 
doi:10.1117/1.602352 fatcat:jje5gadczffxble6sizwkxrsxy

A hierarchical shadow volume algorithm

Timo Aila, Tomas Akenine-Möller
2004 Proceedings of the ACM SIGGRAPH/EUROGRAPHICS conference on Graphics hardware - HWWS '04  
If a tile contains a shadow boundary (3rd image), the corresponding low-resolution shadow data is more or less random. This is corrected by applying per-pixel rasterization to boundary tiles.  ...  Figure 1 : From left to right: Correct shadows, low-resolution shadows (sample per 8 × 8 pixel tile), tiles that may contain a shadow boundary (green/light gray), and an image showing accurately processed  ...  On-chip caches Vertex Shader Lo-res (8x8) Rasterizer (LR) Early Occlusion Test (OCC) Zmin,Zmax Rasterizer Pixel Shader Smin,Smax, FS Stage 2 Stage 1 Delay Non-SV path Per SV buffer  ... 
doi:10.1145/1058129.1058132 fatcat:3up7tnwo7zcddiayxvzimh7efe

Dual Zero-Watermarking Scheme for Two-Dimensional Vector Map Based on Delaunay Triangle Mesh and Singular Value Decomposition

Xu Xi, Xinchang Zhang, Weidong Liang, Qinchuan Xin, Pengcheng Zhang
2019 Applied Sciences  
Next, zero-watermarks are obtained by executing exclusive disjunction (XOR) with the encrypted watermark image under the Arnold scramble algorithm.  ...  The proposed dual zero-watermarking scheme combines the advantages of individual watermarking schemes and is robust against such attacks as geometric attacks, vertex attacks and object attacks.  ...  Acknowledgments: We thank all reviewers for their constructive comments. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/app9040642 fatcat:fntlmb5hrbc4zf36ndcva2wsoq

Experience with a Difference Engine for Graphics [article]

A.A.M. Kuijk, E.H. Blake, E.H. Steffens
1994 Eurographics Workshop on Graphics Hardware  
The speed is partly achieved by the use of custom VLSI components for the lowest level primitive operations and this permits the video rate reconstruction of images and other signals com pressed by encoding  ...  We believe there are significant lessons here for graphics researchers who might want to develop their own systems."  ...  Herzberger (University of Amster dam) for providing the facilities and manpower to help build the prototype.  ... 
doi:10.2312/eggh/eggh94/036-047 dblp:conf/egh/KuijkBS94 fatcat:rcuwrmg4mfdhjjd24ncfnfluva

Semantic Labeling of Large-Area Geographic Regions Using Multi-View and Multi-Date Satellite Images and Noisy OSM Training Labels

Bharath Comandur, Avinash Kak
2021 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
We present a novel multi-view training framework and CNN architecture for combining information from multiple overlapping satellite images and noisy training labels derived from OpenStreetMap (OSM) to  ...  The system we present is end-to-end automated, which facilitates comparing the classifiers trained directly on true orthophotos vis-a-vis first training them on the off-nadir images and subsequently translating  ...  Such a transformation requires that we have knowledge of the heights of the points.  ... 
doi:10.1109/jstars.2021.3066944 fatcat:6l55svrz4zbermqcb366btxrka

Investigation of the seasonal microbiome of Anopheles coluzzii mosquitoes in Mali

Benjamin J. Krajacich, Diana L. Huestis, Adama Dao, Alpha S. Yaro, Moussa Diallo, Asha Krishna, Jiannong Xu, Tovi Lehmann, Olle Terenius
2018 PLoS ONE  
These seasonal shifts were primarily in Ralstonia, Sphingorhabdus, and Duganella spp. bacteria that are usually soil and water-associated, indicating these changes may be from bacteria acquired in the  ...  From these data, we found several compositional differences that were seasonally and spatially linked.  ...  Acknowledgments We thank the residents of M'Piabougou, Zanga, and N'Gabakoro for their assistance and permission to collect samples in/around their houses. We thank Dr.  ... 
doi:10.1371/journal.pone.0194899 pmid:29596468 pmcid:PMC5875798 fatcat:v3euz7sjp5as3ioubrx56niuqy

Digital color imaging

G. Sharma, H.J. Trussell
1997 IEEE Transactions on Image Processing  
This paper surveys current technology and research in the area of digital color imaging.  ...  Algorithms for processing color images for display and communication are surveyed, and a forecast of research trends is attempted. An extensive bibliography is provided.  ...  Fairchild, and Prof. B. V. Funt for their helpful comments and suggestions. We would also like to acknowledge assistance received from Dr. R. R. Buckley, Dr. P. L. Vora, Dr. R.  ... 
doi:10.1109/83.597268 pmid:18282983 fatcat:ajn6eorimnbufm257jnfzq33fq
« Previous Showing results 1 — 15 out of 286 results