Dr. David Akopian Profile

Dr. David Akopian

Associate Professor at Univ of Texas at San Antonio

SPIE Involvement:

Conference Program Committee | Editor | Author

Publications (35)

Proceedings Article | 11 March 2015 Paper

A privacy protection for an mHealth messaging system

Lakshmipathi Aaleswara, David Akopian, Anthony Chronopoulos

Proceedings Volume 9411, 94110S (2015) https://doi.org/10.1117/12.2086647

KEYWORDS: Medicine, Information security, Computer security, Databases, Telecommunications, Control systems, Global system for mobile communications, Mobile communications, Digital filtering, Network security

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Proceedings Article | 11 March 2015 Paper

A sensor data format incorporating battery charge information for smartphone-based mHealth applications

Rodrigo Escobar, David Akopian, Rajendra Boppana

Proceedings Volume 9411, 941103 (2015) https://doi.org/10.1117/12.2083758

KEYWORDS: Sensors, Data communications, Medicine, Binary data, Standards development, Telecommunications, Mobile devices, Data storage servers, Data processing, Magnetic sensors

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Proceedings Article | 11 March 2015 Paper

Indoor positioning system using WLAN channel estimates as fingerprints for mobile devices

Erick Schmidt, David Akopian

Proceedings Volume 9411, 94110R (2015) https://doi.org/10.1117/12.2083670

KEYWORDS: Received signal strength, Error analysis, Fourier transforms, Receivers, Mobile devices, Statistical analysis, LabVIEW, Standards development, Pattern recognition, Modulation

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Proceedings Article | 11 March 2015 Paper

Platform-dependent optimization considerations for mHealth applications

Sahak Kaghyan, David Akopian, Hakob Sarukhanyan

Proceedings Volume 9411, 94110K (2015) https://doi.org/10.1117/12.2080905

KEYWORDS: Sensors, Signal processing, Mobile devices, Gyroscopes, Feature extraction, Data processing, Data acquisition, Detection and tracking algorithms, Global Positioning System, Galactic astronomy

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Proceedings Article | 18 February 2014 Paper

Dealing with faulty measurements in WLAN indoor positioning

Jafet Morales, David Akopian, Sos Agaian

Proceedings Volume 9030, 90300P (2014) https://doi.org/10.1117/12.2058610

KEYWORDS: Received signal strength, Switching, Databases, Switches, Systems modeling, Mobile devices, Distance measurement, Environmental sensing, Signal detection, Navigation systems

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Proceedings Article | 18 February 2014 Paper

Human activity recognition by smartphones regardless of device orientation

Jafet Morales, David Akopian, Sos Agaian

Proceedings Volume 9030, 90300I (2014) https://doi.org/10.1117/12.2043180

KEYWORDS: Gyroscopes, Principal component analysis, Sensors, Detection and tracking algorithms, Feature extraction, Feature selection, Signal analyzers, Databases, Cell phones, Machine learning

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Proceedings Article | 18 February 2014 Paper

Indoor positioning system using WLAN multipath signals as fingerprints for mobile devices

Anirban Saha, David Akopian

Proceedings Volume 9030, 90300H (2014) https://doi.org/10.1117/12.2040470

KEYWORDS: Global Positioning System, Received signal strength, Mobile devices, Databases, Binary data, Satellites, Local area networks, Detection and tracking algorithms, Receivers, Signal processing

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Proceedings Article | 18 February 2014 Paper

A remote laboratory for USRP-based software defined radio

Rudresh Gandhinagar Ekanthappa, Rodrigo Escobar, Achot Matevossian, David Akopian

Proceedings Volume 9030, 903003 (2014) https://doi.org/10.1117/12.2044216

KEYWORDS: LabVIEW, Modulation, Signal detection, Eye, Telecommunications, Human-machine interfaces, Computing systems, Java, Data communications, Cameras

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Proceedings Article | 7 March 2013 Paper

MessageSpace: a messaging system for health research

Rodrigo Escobar, David Akopian, Deborah Parra-Medina, Laura Esparza

Proceedings Volume 8667, 86670V (2013) https://doi.org/10.1117/12.2007530

KEYWORDS: Databases, Medicine, Data modeling, Telecommunications, Analytics, Data communications, Java, Global system for mobile communications, Human-machine interfaces, Solid state lighting

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Proceedings Article | 7 March 2013 Paper

Human movement activity classification approaches that use wearable sensors and mobile devices

Sahak Kaghyan, Hakob Sarukhanyan, David Akopian

Proceedings Volume 8667, 86670O (2013) https://doi.org/10.1117/12.2007868

KEYWORDS: Sensors, Mobile devices, Detection and tracking algorithms, Video, Data modeling, Gyroscopes, Data processing, Evolutionary algorithms, Cell phones, Cameras

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Proceedings Article | 10 February 2012 Paper

Template-based education toolkit for mobile platforms

Santosh Chandana Golagani, Moosa Esfahanian, David Akopian

Proceedings Volume 8304, 83040O (2012) https://doi.org/10.1117/12.909613

KEYWORDS: Image filtering, Image processing, Digital filtering, Image compression, Cell phones, Java, Edge detection, Quantization, Optical filters, Computer programming

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Proceedings Article | 10 February 2012 Paper

SUPL support for mobile devices

Jayanthi Narisetty, Arpine Soghoyan, Mohanapriya Sundaramurthy, David Akopian

Proceedings Volume 8304, 830409 (2012) https://doi.org/10.1117/12.910162

KEYWORDS: Global Positioning System, Java, Receivers, Mobile devices, Computer programming, Satellites, LabVIEW, Telecommunications, Global system for mobile communications, Satellite navigation systems

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Proceedings Article | 31 May 2011 Paper

Multiple user access and testing for PreNotiS: a fast mobile event reporting solution

Michael Chan, Abhinav Kumar, David Akopian, Sos Agaian

Proceedings Volume 8063, 80630Y (2011) https://doi.org/10.1117/12.881302

KEYWORDS: Databases, Information science, Prototyping, Mobile devices, Cell phones, Safety, Data communications, Roads, Receivers, Logic

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Proceedings Article | 31 May 2011 Paper

Application of wavelet polynomial threshold for interpolation and denoising in bioimaging

Michael Chan, Sushanth Sathyanarayana, David Akopian, Sos Agaian

Proceedings Volume 8063, 80630Z (2011) https://doi.org/10.1117/12.881304

KEYWORDS: 3D image processing, Denoising, Image filtering, Gaussian filters, Digital filtering, Wavelets, Wavelet transforms, Brain, Neuroimaging, Magnetic resonance imaging

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Proceedings Article | 31 May 2011 Paper

eComLab: remote laboratory platform

Murillo Pontual, Arsen Melkonyan, Andreas Gampe, Grant Huang, David Akopian

Proceedings Volume 8063, 806311 (2011) https://doi.org/10.1117/12.883449

KEYWORDS: Video, Internet, Databases, Control systems, Operating systems, Human-machine interfaces, Cameras, Electronic components, Information technology, Modulation

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Proceedings Article | 27 May 2011 Paper

An adaptive LMS technique for wavelet polynomial threshold denoising

Sushanth Sathyanarayana, David Akopian, Sos Agaian

Proceedings Volume 8063, 806308 (2011) https://doi.org/10.1117/12.881297

KEYWORDS: Wavelets, Denoising, Wavelet transforms, Statistical analysis, Magnetic resonance imaging, Computed tomography, Interference (communication), Error analysis, Optimization (mathematics), Biomedical optics

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Proceedings Article | 11 February 2011 Paper

Mobile text messaging solutions for obesity prevention

David Akopian, Varun Jayaram, Lakshmipathi Aaleswara, Moosa Esfahanian, Cynthia Mojica, Deborah Parra-Medina, Sahak Kaghyan

Proceedings Volume 7881, 788104 (2011) https://doi.org/10.1117/12.871882

KEYWORDS: Cell phones, Databases, Global system for mobile communications, Data communications, Internet, Java, Logic, Software development, Computer programming, Networks

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Proceedings Article | 28 January 2010 Paper

A signal strength priority based position estimation for mobile platforms

Bhargav Kalgikar, David Akopian, Philip Chen

Proceedings Volume 7542, 75420F (2010) https://doi.org/10.1117/12.839554

KEYWORDS: Received signal strength, Databases, Global Positioning System, Java, Cell phones, Distance measurement, Satellites, Receivers, Buildings, Mobile devices

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Proceedings Article | 5 May 2009 Paper

Integrity monitoring in WLAN positioning systems

Sri Phani Yerubandi, Bhargav Kalgikar, Maheedhar Gunturu, David Akopian, Philip Chen

Proceedings Volume 7351, 735109 (2009) https://doi.org/10.1117/12.818338

KEYWORDS: Databases, Global Positioning System, Data modeling, Cell phones, Received signal strength, Buildings, Detection and tracking algorithms, Java, Standards development, Time metrology

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Proceedings Article | 28 January 2009 Paper

Development of mobile preventive notification system (PreNotiS)

Abhinav Kumar, David Akopian, Philip Chen

Proceedings Volume 7256, 72560F (2009) https://doi.org/10.1117/12.805990

KEYWORDS: Java, Cell phones, Databases, Neodymium, Safety, Information security, Mobile devices, Chromium, Standards development, Software development

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The tasks achievable by mobile handsets continuously exceed our imagination. Statistics show that the mobile phone sales are soaring, rising exponentially year after year with predictions being that they will rise to a billion units in 2009, with a large section of these being smartphones. Mobile service providers, mobile application developers and researchers have been working closely over the past decade to bring about revolutionary and hardware and software advancements in hand-sets such as embedded digital camera, large memory capacity, accelerometer, touch sensitive screens, GPS, Wi- Fi capabilities etc. as well as in the network infrastructure to support these features. Recently we presented a multi-platform, massive data collection system from distributive sources such as cell phone users¹ called PreNotiS. This technology was intended to significantly simplify the response to the events and help e.g. special agencies to gather crucial information in time and respond as quickly as possible to prevent or contain potential emergency situations and act as a massive, centralized evidence collection mechanism that effectively exploits the advancements in mobile application development platforms and the existing network infrastructure to present an easy-touse, fast and effective tool to mobile phone users. We successfully demonstrated the functionality of the client-server application suite to post user information onto the server. This paper presents a new version of the system PreNotiS, with a revised client application and with all new server capabilities. PreNotiS still puts forth the idea of having a fast, efficient client-server based application suite for mobile phones which through a highly simplified user interface will collect security/calamity based information in a structured format from first responders and relay that structured information to a central server where this data is sorted into a database in a predefined manner. This information which includes selections, images and text will be instantly available to authorities and action forces through a secure web portal thus helping them to make decisions in a timely and prompt manner. All the cell phones have self-localizing capability according to FCC E911² mandate, thus the communicated information can be further tagged automatically by location and time information at the server making all this information available through the secure web-portal.

Proceedings Article | 28 January 2009 Paper

An assisted GPS support for GPS simulators for embedded mobile positioning

Pradeep Kashyap, Abhay Samant, Phani K. Sagiraju, David Akopian

Proceedings Volume 7256, 72560G (2009) https://doi.org/10.1117/12.806001

KEYWORDS: Global Positioning System, Receivers, Satellites, Data communications, Standards development, Global system for mobile communications, Doppler effect, LabVIEW, Networks, Wireless communications

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Proceedings Article | 28 January 2009 Paper

A secure wireless mobile-to-server link

Abhinav Kumar, David Akopian, Sos Agaian, Reiner Creutzburg

Proceedings Volume 7256, 725602 (2009) https://doi.org/10.1117/12.805957

KEYWORDS: Java, Steganography, Cryptography, Cell phones, Multimedia, Mobile devices, Video, Mobile communications, Network security, Internet

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Proceedings Article | 3 April 2008 Paper

Fast massive preventive security and information communication systems

David Akopian, Philip Chen, Susheel Miryakar, Abhinav Kumar

Proceedings Volume 6982, 69820Y (2008) https://doi.org/10.1117/12.777824

KEYWORDS: Telecommunications, Cell phones, Information security, Data communications, Internet, Databases, Computer security, Java, Roads, Software development

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Proceedings Article | 3 April 2008 Paper

Implementation of an intrusion detection system based on wireless positioning

David Akopian, Philip Chen, Maheedhar Gunturu, Phani Sagiraju

Proceedings Volume 6982, 698205 (2008) https://doi.org/10.1117/12.777815

KEYWORDS: Received signal strength, Legal, Databases, Computer intrusion detection, Network security, Local area networks, Algorithm development, Detection and tracking algorithms, Standards development, Error analysis

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Proceedings Article | 3 April 2008 Paper

Nonuniform pulse quantization for multiplication-free correlation in ultra-wideband receivers

Khalil Naghdali, Serkan Dursun, David Akopian

Proceedings Volume 6980, 698009 (2008) https://doi.org/10.1117/12.778776

KEYWORDS: Receivers, Quantization, Signal processing, Optical correlators, Binary data, Digital signal processing, Modulation, Wireless communications, Data processing, Signal generators

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Proceedings Article | 2 May 2006 Paper

An imaging toolbox for smart phone applications

Alexandr Panchul, Deepthi Bhupathiraju, Sos Agaian, David Akopian

Proceedings Volume 6250, 625006 (2006) https://doi.org/10.1117/12.665219

KEYWORDS: Cell phones, Human-machine interfaces, Transform theory, Digital signal processing, Image processing, Visualization, Cameras, Image analysis, Defense and security, C++

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Proceedings Article | 10 February 2006 Paper

Wireless steganography

Sos Agaian, David Akopian, Sunil D'Souza

Proceedings Volume 6074, 60740G (2006) https://doi.org/10.1117/12.650263

KEYWORDS: Cell phones, Steganography, Mobile devices, Data hiding, Operating systems, C++, Manufacturing, RGB color model, Video, Software development

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Proceedings Article | 25 May 2005 Paper

Two algorithms for compressing noise like signals

Sos Agaian, Ravindranath Cherukuri, David Akopian

Proceedings Volume 5809, (2005) https://doi.org/10.1117/12.603797

KEYWORDS: Image compression, Binary data, Interference (communication), Algorithm development, Computer simulations, Reconstruction algorithms, Neodymium, Roads, Computer programming, Signal processing

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Proceedings Article | 8 March 2005 Paper

A reduced complexity frequency domain acquisition of DS-SS signals for embedded applications

David Akopian, Phani Sagiraju, Sos Agaian, G. Raju

Proceedings Volume 5683, (2005) https://doi.org/10.1117/12.584980

KEYWORDS: Receivers, Optical correlators, Modulation, Signal processing, Global Positioning System, Digital signal processing, Convolution, Satellites, Fourier transforms, Demodulation

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Proceedings Article | 19 April 2004 Paper

Scalable transform accelerator for multimedia communications

David Akopian, Jarmo Takala, Sos Agaian

Proceedings Volume 5309, (2004) https://doi.org/10.1117/12.525681

KEYWORDS: Multimedia, Video coding, Electronic imaging, Video compression, Semantic video, Video, Parallel processing

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Proceedings Article | 23 August 2000 Paper

Multibase transform coding for multispectral image compression

David Akopian, Jussi Parkkinen, Timo Jaaskelainen, Jaakko Astola

Proceedings Volume 4049, (2000) https://doi.org/10.1117/12.410375

KEYWORDS: Image compression, Wavelet transforms, Multispectral imaging, RGB color model, Wavelets, Quantization, Binary data, Image segmentation, Image processing, Distance measurement

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Proceedings Article | 14 October 1997 Paper

Optimal nonlinear extension of linear filters based on distributed arithmetic

David Akopian, Jaakko Astola

Proceedings Volume 3167, (1997) https://doi.org/10.1117/12.290273

KEYWORDS: Linear filtering, Nonlinear filtering, Binary data, Gaussian filters, Image filtering, Optimal filtering

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Proceedings Article | 10 January 1997 Paper

Fast regular 2D algorithms for trigonometric transforms

Jaakko Astola, David Akopian

Proceedings Volume 3024, (1997) https://doi.org/10.1117/12.263300

KEYWORDS: Transform theory, Algorithm development, Matrices, Evolutionary algorithms, Signal processing, Antimony, Radon, Fourier transforms, Filtering (signal processing), Americium

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Proceedings Article | 13 March 1996 Paper

Architecture-oriented regular algorithms for discrete sine and cosine transforms

Jaakko Astola, David Akopian

Proceedings Volume 2666, (1996) https://doi.org/10.1117/12.234740

KEYWORDS: Transform theory, Matrices, Algorithm development, Binary data, Radon, Filtering (signal processing), Digital filtering, Signal processing, Optical filters, Bismuth

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Proceedings Article | 21 April 1995 Paper

New architecture for running threshold Boolean filtering

Jaakko Astola, David Akopian, Karen Egiazarian

Proceedings Volume 2501, (1995) https://doi.org/10.1117/12.206742

KEYWORDS: Digital filtering, Binary data, Electronic filtering, Linear filtering, Filtering (signal processing), Nonlinear filtering, Xenon, Signal processing, Switches, Computer architecture

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Showing 5 of 35 publications

Proceedings Volume Editor (7)

SPIE Conference Volume | 3 April 2015

Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015

SPIE Conference Volume | 20 February 2014

Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014

SPIE Conference Volume | 26 March 2013

Multimedia Content and Mobile Devices

SPIE Conference Volume | 8 February 2012

Multimedia on Mobile Devices 2012; and Multimedia Content Access: Algorithms and Systems VI

SPIE Conference Volume | 8 February 2011

Multimedia on Mobile Devices 2011; and Multimedia Content Access: Algorithms and Systems V

Showing 5 of 7 publications

Conference Committee Involvement (30)

Multimodal Image Exploitation and Learning 2025

14 April 2025 | Orlando, Florida, United States

Multimodal Image Exploitation and Learning 2024

22 April 2024 | National Harbor, Maryland, United States

Multimodal Image Exploitation and Learning 2023

1 May 2023 | Orlando, Florida, United States

Multimodal Image Exploitation and Learning 2022

4 April 2022 | Orlando, Florida, United States

Multimodal Image Exploitation and Learning 2021

12 April 2021 | Online Only, Florida, United States

Mobile Image Exploitation and Learning 2020

27 April 2020 | Online Only, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2019

15 April 2019 | Baltimore, MD, United States

Mobile Multimedia/Image Processing, Security, and Applications 2018

16 April 2018 | Orlando, FL, United States

Mobile Multimedia/Image Processing, Security, and Applications 2017

10 April 2017 | Anaheim, CA, United States

Mobile Multimedia/Image Processing, Security, and Applications 2016

18 April 2016 | Baltimore, MD, United States

Mobile Multimedia/Image Processing, Security, and Applications 2015

20 April 2015 | Baltimore, MD, United States

Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015

10 February 2015 | San Francisco, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2014

5 May 2014 | Baltimore, MD, United States

Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014

3 February 2014 | San Francisco, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2013

29 April 2013 | Baltimore, Maryland, United States

Multimedia on Mobile Devices 2013

4 February 2013 | Burlingame, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2012

23 April 2012 | Baltimore, Maryland, United States

Multimedia on Mobile Devices 2012

25 January 2012 | Burlingame, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2011

25 April 2011 | Orlando, Florida, United States

Multimedia on Mobile Devices 2011

25 January 2011 | San Francisco Airport, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2010

5 April 2010 | Orlando, Florida, United States

Multimedia on Mobile Devices 2010

18 January 2010 | San Jose, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2009

14 April 2009 | Orlando, Florida, United States

Multimedia on Mobile Devices 2009

19 January 2009 | San Jose, California, United States

Mobile Multimedia/Image Processing, Security, and Applications 2008

19 March 2008 | Orlando, Florida, United States

Multimedia on Mobile Devices 2008

28 January 2008 | San Jose, California, United States

Mobile Multimedia/Image Processing For Military And Security Applications 2007

11 April 2007 | Orlando, Florida, United States

Multimedia on Mobile Devices 2007

29 January 2007 | San Jose, CA, United States

Mobile Multimedia/Image Processing for Military and Security Applications

20 April 2006 | Orlando (Kissimmee), Florida, United States

Multimedia on Mobile Devices II

16 January 2006 | San Jose, California, United States

Showing 5 of 30 Conference Committees

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