scholarly journals Two-dimensional random access multiphoton spatial frequency modulated imaging

2020 ◽  
Vol 28 (1) ◽  
pp. 405
Author(s):  
Alyssa M. Allende Motz ◽  
John Czerski ◽  
Daniel E. Adams ◽  
Charles Durfee ◽  
Randy Bartels ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Random Access ◽  
Two Dimensional ◽  
Modulated Imaging

Two-dimensional spatial-frequency-modulated imaging through parallel acquisition of line images

2013 ◽  
Vol 38 (11) ◽  
pp. 1763 ◽  
Author(s):  
Daniel J. Higley ◽  
David G. Winters ◽  
Randy A. Bartels
Keyword(s):  
Spatial Frequency ◽  
Two Dimensional ◽  
Parallel Acquisition ◽  
Modulated Imaging

Modulated imaging: quantitative analysis and tomography of turbid media in the spatial-frequency domain

2005 ◽  
Vol 30 (11) ◽  
pp. 1354 ◽  
Author(s):  
David J. Cuccia ◽  
Frederic Bevilacqua ◽  
Anthony J. Durkin ◽  
Bruce J. Tromberg
Keyword(s):  
Quantitative Analysis ◽  
Spatial Frequency ◽  
Frequency Domain ◽  
Turbid Media ◽  
Modulated Imaging ◽  
Spatial Frequency Domain

Two‐Dimensional Materials‐Based Static Random‐Access Memory

2021 ◽  
pp. 2107894
Author(s):  
Chang‐Ju Liu ◽  
Yi Wan ◽  
Lain‐Jong Li ◽  
Chih‐Pin Lin ◽  
Tuo‐Hung Hou ◽  
...  
Keyword(s):  
Random Access ◽  
Random Access Memory ◽  
Static Random Access Memory ◽  
Two Dimensional ◽  
Access Memory ◽  
Two Dimensional Materials

The Image Watermarking against Shearing Based on Dopplerlet Transformation

2011 ◽  
Vol 181-182 ◽  
pp. 276-280
Author(s):  
Ming Hui Deng ◽  
Wen Zhe Li ◽  
Qi Chen Li
Keyword(s):  
Spatial Frequency ◽  
Dimensional Space ◽  
Image Watermarking ◽  
Time Windows ◽  
Geometric Distortion ◽  
Frequency Change ◽  
Two Dimensional ◽  
Frequency Distributions ◽  
Chirp Signals ◽  
Wigner Transformation

In this paper, a robust image watermarking method in two-dimensional space/spatial-frequency distributions domain is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The dopplerlet transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering methods and exhibits geometrical symmetry. In the two-dimensional Radon-Wigner transformation domain, the chirp signals used as watermarks change only its position in space/spatial-frequency distribution, after applying linear geometrical attack, such as scale rotation and cropping. But the two-dimensional Radon-Wigner transformation needs too much difficult computing. So the image is put into a series of 1D signal by choosing scalable local time windows. The watermark embedded in the dopplerlet transformation domain. The watermark thus generated is invisible and performs well in StirMark test and is robust to geometrical attacks. Compared with other watermarking algorithms, this algorithm is more robust, especially against geometric distortion, while having excellent frequency properties.

Extending the performance of linear and nonlinear spatial frequency modulated imaging platforms (Conference Presentation)

2018 ◽  
Author(s):  
Jeffrey A. Squier ◽  
Nathan Worts ◽  
Alyssa Allende Motz ◽  
Jeff Field ◽  
Keith Wernsing ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Linear And Nonlinear ◽  
Modulated Imaging

scholarly journals Two-Dimensional Spatial Frequency Content and Confusions among Dot Matrix Characters

1979 ◽  
Vol 23 (1) ◽  
pp. 384-388
Author(s):  
Michael E. Maddox
Keyword(s):  
Spatial Frequency ◽  
Similarity Measure ◽  
Similarity Measures ◽  
Final Analysis ◽  
Second Phase ◽  
Two Dimensional ◽  
Two Phase ◽  
Frequency Spectra ◽  
Character Size ◽  
Point Fast Fourier Transform

A two-phase study was conducted which related the confusions among dot matrix characters to the two-dimensional spatial frequency similarity of these characters. During the first phase of the study, subjects were shown single alphanumeric characters from four different dot matrix fonts and five matrix size/character sub-tense combinations. Data from this phase of the research were analyzed in terms of both correctness and character confusion frequencies. The second phase of the study consisted of digitizing and analyzing all characters from two of the fonts used in the first phase. The fonts chosen represent the most and least confusable of the four, based on the performance data obtained. These characters were scanned photometrically using a computer-controlled X-Y stage and subjected to a 512 × 512 point fast Fourier transform (FFT). The Fourier coefficients were correlated for all possible character pairs within each font-matrix/character size cell. These correlations provided an objective similarity measure among characters based upon their 2-D spatial frequency spectra. In addition to the spatial frequency similarity measure, a simple digital Phi coefficient was calculated for each character pair. The final analysis performed in this study was the correlation of observed performance (confusions) with objective similarity measures (2-D spectra and Phi coefficients).

Observer-based H∞ control of two-dimensional delayed networks under the random access protocol

2020 ◽  
Vol 401 ◽  
pp. 353-363 ◽  
Author(s):  
Dehao Li ◽  
Jinling Liang ◽  
Fan Wang ◽  
Xinwei Ren
Keyword(s):  
Random Access ◽  
Two Dimensional ◽  
Access Protocol ◽  
Random Access Protocol
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