Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: David W. Allen (Fed)

Displaying 51 - 75 of 168

An analysis of the nonlinear spectral mixing of didymium and soda-lime glass beads using hyperspectral imagery (HSI) microscopy

June 13, 2014

Author(s)

Ronald G. Resmini, Robert S. Rand, Christopher Deloye, David W. Allen

Nonlinear spectral mixing occurs when materials are intimately mixed. Intimate mixing is a common characteristic of granular materials such as soils. A linear spectral unmixing inversion applied to a nonlinear mixture will yield subpixel abundance

A collection and statistical analysis of skin reflectance signatures for inherent variability over the 250 nm to 2500 nm spectral range

June 4, 2014

Author(s)

P. Yvonne Barnes, Benjamin K. Tsai, David W. Allen

The spectral reflectance signature of human skin provides opportunities to advance observations ranging from medical treatment to security applications. In this study 28 volunteers participated in a skin reflectance measurement of the inside of the right

Reflectance measurements of human skin from the ultraviolet to the shortwave infrared (250 nm to 2500 nm)

May 29, 2013

Author(s)

Catherine C. Cooksey, David W. Allen

While published literature of the optical properties of human skin is prevalent for the visible region, data are sparse in the ultra violet and shortwave infrared. Spectral imaging has expanded from primarily an earth remote sensing tool to a range of

A microscene approach to the evaluation of hyperspectral system level performance

May 18, 2013

Author(s)

David W. Allen, Ronald G. Resmini, Christopher Deloye

Assessing the ability of a hyperspectral imaging (HSI) system to detect the presence of a substance or to quantify abundance requires an understanding of the many factors in the end-to-end remote sensing scenario from scene to sensor to data exploitation

An Analysis of the Probability Distribution of Spectral Angle and Euclidean Distance in Hyperspectral Remote Sensing Using Microspectroscopy

May 18, 2013

Author(s)

Ronald G. Resmini, Christopher Deloye, David W. Allen

Determining the probability distribution of hyperspectral imagery (HSI) data and of the results of algorithms applied to those data, is critical to understanding algorithm performance and for establishing performance metrics such as probability of

Calibration and validation scheme for in vivo spectroscopic imaging of tissue oxygenation

August 9, 2012

Author(s)

Maritoni A. Litorja, Robert C. Chang, Jeeseong Hwang, David W. Allen

The determination of the level of oxygenation in optically accessible tissues using multispectral or hyperspectral imaging (HSI ) of oxy- and deoxyhemoglobin has special appeal in clinical work due to its non-invasiveness, ease of use and capability of

Developing digital tissue phantoms for hyperspectral imaging of ischemic wounds

May 18, 2012

Author(s)

David W. Allen, Jeeseong Hwang, Maritoni A. Litorja, Joseph P. Rice

Biomedical optical imaging has the potential to achieve high spatial resolution and high functional sensitivity for non-invasive assessment of ischemic wounds. However, clinical acceptance of many optical imaging devices is hampered by poor reproducibility

The evaluation of hyperspectral imaging for the detection of person-borne threat objects over the 400 nm to 1700 nm spectral region

May 10, 2012

Author(s)

P. Yvonne Barnes, Jorge Neira, David W. Allen

The detection of person-borne threat objects, such as improvised explosive devices, at a safe distance is an ongoing challenge. While much attention has been given to other parts of the electromagnetic spectrum, very little is known about what potential

Algorithm Validation Using Multicolor Phantoms

May 9, 2012

Author(s)

Daniel V. Samarov, Matthew L. Clarke, Ji Y. Lee, David W. Allen, Maritoni A. Litorja, Jeeseong Hwang

We present a framework for hyperspectral image (HSI) analysis validation, specifically abundance fraction estimation based on HSI measurements of water soluble dye mixtures printed on microarray chips. In our work we focus on the performance of two

Designing Microarrays Phantoms for Hyperspectral Imaging Validation

May 9, 2012

Author(s)

Matthew L. Clarke, Ji Y. Lee, Daniel V. Samarov, David W. Allen, Maritoni A. Litorja, Ralph Nossal, Jeeseong Hwang

The simple design of custom-tailored microarrays for the characterization of hyperspectral imaging systems and analysis methods for biologically relevant samples. Individual and mixtures of dyes were printed on microscope slides and imaged by a

Hyperspectral Image Projector Applications

February 15, 2012

Author(s)

Joseph P. Rice, Steven W. Brown, David W. Allen, Howard W. Yoon, Maritoni A. Litorja, Jeeseong Hwang

For the past several years NIST has been developing, along with several collaborators, a Hyperspectral Image Projector (HIP). This scene projector produces high-resolution programmable spectra and projects them into dynamic two-dimensional images. The

Hyperspectral Imaging of Ischemic Wounds

February 1, 2012

Author(s)

David W. Allen

Optical imaging has the potential to achieve high spatial resolution and high functional sensitivity in wound assessment. However, clinical acceptance of many optical imaging devices is hampered by poor reproducibility, low accuracy, and lack of biological

Validating the LASSO Algorithm by Unmixing Spectral Signatures in Multicolor Phantoms

February 1, 2012

Author(s)

Daniel V. Samarov, Matthew L. Clarke, Ji Y. Lee, David W. Allen, Maritoni A. Litorja, Jeeseong Hwang

As hyperspectral imaging (HSI) sees increased implementation into the biological and medical fields it becomes increasingly important that the algorithms being used to analyze the corresponding output be validated. While certainly important under any