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公开(公告)号：US20200053270A1
公开(公告)日：2020-02-13
申请号：US16657343
申请日：2019-10-18
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang , Shilin Zhu
Abstract: A visual privacy system unilaterally blocks rolling shutter cameras by providing a periodically interrupted ambient light source imposing bright and dark bands on the image yet at a frequency imperceptible to human observers in the environment. Communication of the modulation pattern to authorized cameras allows unaffected imaging in these regions by authorized individuals. The system also contemplates operation in a barcoding mode with a light modulation providing embedded barcodes that can be extracted from images taken in the region to indicate that the images were improperly acquired and to block the images in certain applications.
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公开(公告)号：US10469763B2
公开(公告)日：2019-11-05
申请号：US15616386
申请日：2017-06-07
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang , Shilin Zhu
Abstract: A visual privacy system unilaterally blocks rolling shutter cameras by providing a periodically interrupted ambient light source imposing bright and dark bands on the image yet at a frequency imperceptible to human observers in the environment. Communication of the modulation pattern to authorized cameras allows unaffected imaging in these regions by authorized individuals. The system also contemplates operation in a barcoding mode with a light modulation providing embedded barcodes that can be extracted from images taken in the region to indicate that the images were improperly acquired and to block the images in certain applications.
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公开(公告)号：US10251027B2
公开(公告)日：2019-04-02
申请号：US15379950
申请日：2016-12-15
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang
Abstract: A system for identifying the location of a mobile device uses signatures of standard room lighting derived from the frequency spectrum of light fluctuations associated with driver circuitry of that lighting. Improved sensitivity (frequency and dynamic range) are provided by using a pair of dedicated photodetectors which may deduce a one-dimensional angular location of a light source by comparing the signals developed by two photodetectors having different angular sensitivities.
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公开(公告)号：US20180176739A1
公开(公告)日：2018-06-21
申请号：US15379950
申请日：2016-12-15
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang
IPC: H04W4/04
Abstract: A system for identifying the location of a mobile device uses signatures of standard room lighting derived from the frequency spectrum of light fluctuations associated with driver circuitry of that lighting. Improved sensitivity (frequency and dynamic range) are provided by using a pair of dedicated photodetectors which may deduce a one-dimensional angular location of a light source by comparing the signals developed by two photodetectors having different angular sensitivities.
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公开(公告)号：US20170108994A1
公开(公告)日：2017-04-20
申请号：US14885490
申请日：2015-10-16
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang , Joshua Tabor , Jialiang Zhang
IPC: G06F3/042 , G06F3/0488 , G06F3/01 , G06F3/041
CPC classification number: G06F3/014 , G06F3/03547 , G06F3/0418 , G06F3/0428 , G06F2203/04103
Abstract: A virtual touchscreen for mobile devices provides a touchscreen area displaced to a side of the display to eliminate problems of a finger blocking the display during normal touchscreen operation. The virtual touchscreen may be monitored by a sensor system looking edgewise from a housing of the mobile device employing as few as two displaced photodetectors and a correspondingly oriented light source constrained to sensitivity within a narrow fan-shaped light-sensing plane. Extraction of the spatial location of a finger touch within this touchscreen area may be performed by a model of reflected light signals of a finger in different locations calibrated to environmental parameters of finger reflectivity and background reflectivity by a simple calibration process.
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Patent Agency Ranking
公开(公告)号：US09712234B1
公开(公告)日：2017-07-18
申请号：US14980103
申请日：2015-12-28
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Suman Banerjee , Jialiang Zhang , Chi Zhang
IPC: H04B10/00 , H04B10/116 , H04W4/02
CPC classification number: H04B10/116 , H04W4/023 , H04W4/026
Abstract: A visible light communication system identifies the location of a mobile device using light intensities corrected by mobile device orientation. This location can be used to generate a dynamic cluster of visible light transmitters about the mobile device providing improved “handoff” between transmitters and reduced shadowing.
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公开(公告)号：US20170187454A1
公开(公告)日：2017-06-29
申请号：US14980103
申请日：2015-12-28
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Suman Banerjee , Jialiang Zhang , Chi Zhang
IPC: H04B10/116 , H04W4/02
CPC classification number: H04B10/116 , H04W4/023 , H04W4/026
Abstract: A visible light communication system identifies the location of a mobile device using light intensities corrected by mobile device orientation. This location can be used to generate a dynamic cluster of visible light transmitters about the mobile device providing improved “handoff” between transmitters and reduced shadowing.
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公开(公告)号：US20180359403A1
公开(公告)日：2018-12-13
申请号：US15616386
申请日：2017-06-07
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang , Shilin Zhu
Abstract: A visual privacy system unilaterally blocks rolling shutter cameras by providing a periodically interrupted ambient light source imposing bright and dark bands on the image yet at a frequency imperceptible to human observers in the environment. Communication of the modulation pattern to authorized cameras allows unaffected imaging in these regions by authorized individuals. The system also contemplates operation in a barcoding mode with a light modulation providing embedded barcodes that can be extracted from images taken in the region to indicate that the images were improperly acquired and to block the images in certain applications.
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公开(公告)号：US20170346558A1
公开(公告)日：2017-11-30
申请号：US15164195
申请日：2016-05-25
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang
IPC: H04B10/116 , H04W4/02
CPC classification number: H04B10/116 , H04W4/02 , H04W4/024
Abstract: A system for identifying the location of the mobile device uses standard fluorescent light fixtures commonly found in indoor environments and detects minor variations in the light output of those fixtures caused by normal manufacturing variation. These variations are catalogued as identifying fingerprints together with location of the light fixtures to provide for navigation.
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公开(公告)号：US11039028B2
公开(公告)日：2021-06-15
申请号：US16657343
申请日：2019-10-18
Applicant: Wisconsin Alumni Research Foundation
Inventor： Xinyu Zhang , Chi Zhang , Shilin Zhu
Abstract: A visual privacy system unilaterally blocks rolling shutter cameras by providing a periodically interrupted ambient light source imposing bright and dark bands on the image yet at a frequency imperceptible to human observers in the environment. Communication of the modulation pattern to authorized cameras allows unaffected imaging in these regions by authorized individuals. The system also contemplates operation in a barcoding mode with a light modulation providing embedded barcodes that can be extracted from images taken in the region to indicate that the images were improperly acquired and to block the images in certain applications.
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