Journal•ISSN: 1946-3251
Spie Reviews
SPIE
About: Spie Reviews is an academic journal. The journal publishes majorly in the area(s): Optical switch & Photonic-crystal fiber. It has an ISSN identifier of 1946-3251. Over the lifetime, 11 publications have been published receiving 889 citations.
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TL;DR: Digital holography is an emerging field of new paradigm in general imaging applications as discussed by the authors, and a review of a subset of the research and development activities in digital holographic microscopy techniques and applications is presented.
Abstract: Digital holography is an emerging field of new paradigm in general imaging applications. We present a review of a subset of the research and development activities in digital holography, with emphasis on microscopy techniques and applications. First, the basic results from the general theory of holography, based on the scalar diffraction theory, are summarized, and a general description of the digital holographic microscopy process is given, including quantitative phase microscopy. Several numerical diffraction methods are described and compared, and a number of representative configurations used in digital holography are described, including off-axis Fresnel, Fourier, image plane, in-line, Gabor, and phase-shifting digital holographies. Then we survey numerical techniques that give rise to unique capabilities of digital holography, including suppression of dc and twin image terms, pixel resolution control, optical phase unwrapping, aberration compensation, and others. A survey is also given of representative application areas, including biomedical microscopy, particle field holography, micrometrology, and holographic tomography, as well as some of the special techniques, such as holography of total internal reflection, optical scanning holography, digital interference holography, and heterodyne holography. The review is intended for students and new researchers interested in developing new techniques and exploring new applications of digital holography.
672 citations
TL;DR: A comprehensive review of the state of the art in video browsing and retrieval systems, with special emphasis on interfaces and applications, which classify them into three groups: applications that use video-player-like interaction, video retrieval applications, and browsing solutions based on video surrogates.
Abstract: We present a comprehensive review of the state of the art in video browsing and retrieval systems, with special emphasis on interfaces and applications. There has been a significant increase in activity (e.g., storage, retrieval, and sharing) employing video data in the past decade, both for personal and professional use. The ever-growing amount of video content available for human consumption and the inherent characteristics of video data-which, if presented in its raw format, is rather unwieldy and costly-have become driving forces for the development of more effective solutions to present video contents and allow rich user interaction. As a result, there are many contemporary research efforts toward developing better video browsing solutions, which we summarize. We review more than 40 different video browsing and retrieval interfaces and classify them into three groups: applications that use video-player-like interaction, video retrieval applications, and browsing solutions based on video surrogates. For each category, we present a summary of existing work, highlight the technical aspects of each solution, and compare them against each other.
84 citations
Journal Article•
TL;DR: In this paper, the authors highlight the characteristics and uses of a few of these exceptional probes and highlight how they can be combined with the FPs from marine organisms to provide quantitative measurements in living systems.
Abstract: We have witnessed remarkable advances over the past decade in the application of optical techniques to visualize the genetically encoded fluorescent proteins (FPs) in living systems. The imaging of the FPs inside living cells has become an essential tool for studies of cell biology and physiology. FPs are now available that span the visible spectrum from deep blue to deep red, providing a wide choice of genetically encoded fluorescent markers. Furthermore, some FPs have been identified that have unusual characteristics that make them useful reporters of the dynamic behaviors of proteins inside cells. These additions to the FP toolbox are now being used for some very innovative live-cell imaging applications. Here, we will highlight the characteristics and uses of a few of these exceptional probes. Many different optical methods can be combined with the FPs from marine organisms to provide quantitative measurements in living systems.
66 citations
TL;DR: In this paper, the authors evaluate the most robust methods for retrieving soil moisture information of bare soil and vegetation-covered soil and evaluate the results of these methods. And they conclude that the neural networks method with passive remote sensing data achieves the best results among all the methods reviewed.
Abstract: Soil-moisture information plays an important role in disaster predictions, environmental
monitoring, and hydrological applications. A large number of research papers have
introduced a variety of methods to retrieve soil-moisture information from different types of
remote sensing data, such as optical data or radar data. We evaluate the most robust methods for
retrieving soil-moisture information of bare soil and vegetation-covered soil. We begin with an
introduction to the importance and challenges of soil-moisture information extraction and the
development of soil-moisture retrieval methods. An overview of soil-moisture retrieval methods
using different remote sensing data is presented-either active or passive or a combination of
both active and passive remote sensing data. The results of the methods are compared, and
the advantages and limitations of each method are summarized. The comparison shows that
using a statistical method gives the best results among others in the group: a combination of
both active and passive sensing methods, reaching a 1.83% gravimetric soil moisture (%GSM)
root-mean-square error (RMSE) and a 96% correlation between the estimated and field soil
measurements. In the group of active remote sensing methods, the best method is a backscatter
empirical model, which gives a 2.32-1.81%GSM RMSE and a 95-97% correlation between the
estimated and the field soil measurements. Finally, among the group of passive remote sensing
methods, a neural networks method gives the most desirable results: a 0.0937%GSM RMSE
and a 100% correlation between the estimated and field soil measurements. Overall, the newly
developed neural networks method with passive remote sensing data achieves the best results
among all the methods reviewed.
65 citations
TL;DR: Approaches for extending the depth of focus of different imaging systems including the human vision system are reviewed, involving digital postprocessing as well as different types of all-optical techniques.
Abstract: We review approaches for extending the depth of focus of different imaging systems including the human vision system. Approaches involving digital postprocessing as well as different types of all-optical techniques are discussed. C 2010 Society of Photo-Optical Instrumentation
47 citations