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332 results on '"Gruev, Viktor"'

57. Bio-inspired imager improves sensitivity in near-infrared fluorescence image-guided surgery

Author

Garcia, Missael, primary, Edmiston, Christopher, additional, York, Timothy, additional, Marinov, Radoslav, additional, Mondal, Suman, additional, Zhu, Nan, additional, Sudlow, Gail P., additional, Akers, Walter J., additional, Margenthaler, Julie, additional, Achilefu, Samuel, additional, Liang, Rongguang, additional, Zayed, Mohamed A., additional, Pepino, Marta Y., additional, and Gruev, Viktor, additional

Published
2018
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63. Residual Interpolation for 3-micropolarizer Design of Division of Focal Plane Polarization Image Sensors

Author

Ahmed, Ashfaq SENG, Zhao, Xiaojin, Gruev, Viktor, Bermak, Amine, Ahmed, Ashfaq SENG, Zhao, Xiaojin, Gruev, Viktor, and Bermak, Amine

Abstract

In this paper, we purpose interpolation technique for a 3-micropolarizer design of division of focal plane (DoFP) image sensor based on polarization residuals. The super pixel of 3-micropolarizer division of focal plane (DoFP) polarization image sensor records the first three (S-0, S-1, S-2) at each frame but each specific pixel within the superpixel has a somewhat different field of view. The missing polarization information creates edges and nonconformities in the polarized images. The micropolarizer consists of a 3-micropolarizer filter array of 0 degrees, 90 degrees, and 135 degrees. The DoFP image sensor output image remains 2D. We will demonstrate the performance of the algorithm on the intensity, degree of linear polarization (DoLP) and angle of linear polarization (AoP) images. We will further demonstrate that our proposed algorithm can estimate suitable missing polarization information for low-resolution images to generate high-resolution images.

Published
2018

64. Four-directional adaptive residual interpolation technique for DoFP polarimeters with different micro-polarizer patterns

Author

Ahmed, Ashfaq SENG, Zhao, Xiaojin, Chang, Jintao, Ma, Hui, Gruev, Viktor, Bermak, Amine, Ahmed, Ashfaq SENG, Zhao, Xiaojin, Chang, Jintao, Ma, Hui, Gruev, Viktor, and Bermak, Amine

Abstract

In this paper, we present a novel interpolation technique for the division of focal plane polarization image sensors, which adaptively determines the polarization residuals of a pixel in four directions. We have analyzed the performance of different micro-polarizer patterns by interpolation and optimized for a polarization microscope with maximized interpolation accuracy. Specifically, we applied our proposed algorithm on patterns of four micro-polarizers (oriented along 90 degrees, 135 degrees, 45 degrees, and 0 degrees), three micro-polarizers (oriented along 0 degrees, 45 degrees, and 90 degrees), and two micro-polarizers (oriented along 0 degrees and 45 degrees), respectively. The experimental results reveal that the three-micropolarizer pattern outperforms the other micro-polarizer patterns for recovering the missing polarization information in terms of mean square error (MSE). Moreover, the visual comparison is enabled with the fibrous structure of human liver carcinoma tissues, which shows excellent agreement with the reported MSE comparison.

Published
2018

65. An 18-band snapshot hyperspectral imaging system for sentinel lymph node dissection with multiple near-infrared fluorophores

Author

Gioux, Sylvain, Gibbs, Summer L., Pogue, Brian W., Blair, Steven, Garcia, Missael, Davis, Tyler, Colanceski, Risto, Ferati, Imran, Kondov, Borislav, Stojanovski, Sinisa, Bogdanovska Todorovska, Magdalena, Toleska Dimitrovska, Natasha, Jakupi, Nexhat, Miladinova, Daniela, Petrusevska, Gordana, Kondov, Goran, and Gruev, Viktor

Published
2021
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80. Residual interpolation for division of focal plane polarization image sensors

Author

Ahmed, Ashfaq, Zhao, Xiaojin, Gruev, Viktor, Zhang, Junchao, Bermak, Amine, Ahmed, Ashfaq, Zhao, Xiaojin, Gruev, Viktor, Zhang, Junchao, and Bermak, Amine

Abstract

Division of focal plane (DoFP) polarization image sensors capture polarization properties of light at every imaging frame. However, these imaging sensors capture only partial polarization information, resulting in reduced spatial resolution output and a varying instantaneous field of overview (IFoV). Interpolation methods are used to reduce the drawbacks and recover the missing polarization information. In this paper, we propose residual interpolation as an alternative to normal interpolation for division of focal plane polarization image sensors, where the residual is the difference between an observed and a tentatively estimated pixel value. Our results validate that our proposed algorithm using residual interpolation can give state-of-the-art performance over several previously published interpolation methods, namely bilinear, bicubic, spline and gradient-based interpolation. Visual image evaluation as well as mean square error analysis is applied to test images. For an outdoor polarized image of a car, residual interpolation has less mean square error and better visual evaluation results. © 2017 Optical Society of America.

Published
2017

84. A compact bio-inspired visible/NIR imager for image-guided surgery (Conference Presentation)

Author

Gao, Shengkui, primary, Garcia, Missael, additional, Edmiston, Chris, additional, York, Timothy, additional, Marinov, Radoslav, additional, Mondal, Suman B., additional, Zhu, Nan, additional, Sudlow, Gail P., additional, Akers, Walter J., additional, Margenthaler, Julie A., additional, Liang, Rongguang, additional, Pepino, Marta, additional, Achilefu, Samuel, additional, and Gruev, Viktor, additional

Published
2016
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87. Polarization Imaging serves as a complimentary tool to NIR fluorescence guided colonoscopy

Author

York Timothy, Charanya Tauseef, Akers Walter, Sudlow Gail, Achilefu Samuel, Gruev Viktor, Rubin Deborah, and Gullicksrud Kyle

Subjects
medicine.diagnostic_test, business.industry, Colorectal cancer, Polarization imaging, Colonoscopy, medicine.disease, Endoscopic imaging, Light intensity, Dysplasia, Medicine, business, Nir fluorescence, Preclinical imaging, Biomedical engineering
Abstract

We developed complementary fluorescence and polarization reporting strategy combining the biochemical and physical properties of dysplasia and cancer for real time detection of lesions in clinically relevant colorectal cancer and inflammation models

Published
2014
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89. Polarisationish, speaking the language and making the movie

Author

How Martin, Temple Shelby, Gruev Viktor, Marshall Justin, Chiou Tsyr-Huei, Johnsen Sonke, Roberts Nicholas, and Cronin Thomas

Subjects
business.industry, Physiology, Physiology (medical), Artificial intelligence, Psychology, computer.software_genre, business, computer, Natural language processing
Published
2013
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90. Effect of matrix properties on transmission and reflectance mode division-of-focal-plane Stokes polarimetry.

Author

Iannucci, Leanne E., Riak, Matthew B., Meitz, Ethan, Bersi, Matthew R., Gruev, Viktor, and Lake, Spencer P.

Subjects
POLARIMETRY, MATRIX effect, REFLECTANCE, LINEAR polarization, BREWSTER'S angle, IMAGE transmission
Abstract

Division-of-focal-plane Stokes polarimetry is emerging as a powerful tool for the microstructural characterization of soft tissues. How individual extracellular matrix (ECM) properties influence polarimetric signals in reflectance or transmission modes of quantitative polarized light imaging (QPLI) is not well understood. We aimed to investigate how ECM properties affect outcomes obtained from division-of-focal-plane polarimetric imaging in reflectance or transmission modes. Tunable collagen gel phantoms were used to modulate ECM properties of anisotropy, collagen density, crosslinking, and absorber density; the effects of degree of linear polarization (DoLP) and angle of polarization (AoP) on polarimetry outcomes were assessed. A model biological tissue (i.e., bovine tendon) was similarly imaged and evaluated using both reflectance and transmission modes. Reflectance QPLI resulted in decreased DoLP compared with transmission mode. A 90 deg shift in AoP was observed between modes but yielded similar spatial patterns. Collagen density had the largest effect on outcomes besides anisotropy in both imaging modes. Both imaging modes were sufficiently sensitive to detect structural anisotropy differences in gels of varying fiber alignment. Conclusions drawn from phantom experiments should carry over when interpreting data from more complex tissues and can help provide context for interpretation of other Stokes polarimetry data. [ABSTRACT FROM AUTHOR]

Published
2023
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93. Binocular Goggle Augmented Imaging and Navigation System provides real-time fluorescence image guidance for tumor resection and sentinel lymph node mapping

Author

B. Mondal, Suman, primary, Gao, Shengkui, additional, Zhu, Nan, additional, Sudlow, Gail P., additional, Liang, Kexian, additional, Som, Avik, additional, Akers, Walter J., additional, Fields, Ryan C., additional, Margenthaler, Julie, additional, Liang, Rongguang, additional, Gruev, Viktor, additional, and Achilefu, Samuel, additional

Published
2015
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