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公开(公告)号：US20250080856A1
公开(公告)日：2025-03-06
申请号：US18293107
申请日：2021-07-29
Applicant: Google LLC
Inventor： Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
Abstract: This document describes techniques and apparatuses for computational photography under low-light conditions for an image-capture device on a mobile computing device. In aspects, described are techniques and apparatuses for an image-capture device to utilize sensor data in determining whether to enable flash photography or capture multiple images of the scene without use of a flash under low-light conditions. In other aspects, an image-capture device may utilize device data in determining whether to enable flash photography or capture multiple images of the scene without use of a flash under low-light conditions. The disclosed techniques and apparatuses may provide improved computational photography under low-light conditions for an image-capture device on a mobile computing device.
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公开(公告)号：US11687635B2
公开(公告)日：2023-06-27
申请号：US17439762
申请日：2019-09-25
Applicant: Google LLC
Inventor： Adarsh Prakash Murthy Kowdle , Ruben Manuel Velarde , Zhijun He , Xu Han , Kourosh Derakshan , Shahram Izadi
CPC classification number: G06F21/32 , G06V10/143 , G06V10/235 , G06V40/166 , H04N5/33 , H04N23/71 , H04N23/72
Abstract: This document describes techniques and systems that enable automatic exposure and gain control for face authentication. The techniques and systems include a user device initializing a gain for a near-infrared camera system using a default gain. The user device ascertains patch-mean statistics of one or more regions-of-interest of a most-recently captured image that was captured by the near-infrared camera system. The user device computes an update in the initialized gain to provide an updated gain that is usable to scale the one or more regions-of-interest toward a target mean-luminance value. The user device dampens the updated gain by using hysteresis. Then, the user device sets the initialized gain for the near-infrared camera system to the dampened updated gain.
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公开(公告)号：US11595585B2
公开(公告)日：2023-02-28
申请号：US17447816
申请日：2021-09-16
Applicant: Google LLC
Inventor： Jinglun Gao , Lin Lu , Gang Sun , Szepo Hung , Ruben Manuel Velarde
IPC: H04N5/235
Abstract: A method includes detecting, based on sensor data from a sensor on a mobile device, an environmental brightness measurement, where the mobile device comprises a display screen configured to adjust display brightness based on environmental brightness. The method further includes determining, based on image data from a camera on the mobile device, an extent to which the detected environmental brightness measurement is caused by reflected light from the display screen. The method additionally includes setting a rate of exposure change for the camera based on the determined extent to which the detected environmental brightness measurement is caused by reflected light from the display screen.
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公开(公告)号：US12120435B2
公开(公告)日：2024-10-15
申请号：US18062387
申请日：2022-12-06
Applicant: Google LLC
Inventor： Gang Sun , Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
IPC: H04N23/745 , H04N23/71 , H04N23/73
CPC classification number: H04N23/745 , H04N23/71 , H04N23/73
Abstract: Techniques and apparatuses are described for reducing a flicker effect of multiple light sources in an image captured with an imaging device. A lighting frequency associated with each of the multiple light sources is detected and prioritized relative to a flicker effect upon the image to identify at least a first-prioritized lighting frequency and a second-prioritized lighting frequency. A first exposure-time factorization set is determined for the first-prioritized lighting frequency, and a second exposure-time factorization set is determined for the second-prioritized lighting frequency. An exposure time of the imaging device is adjusted to an exposure time identified in the first exposure-time factorization set that matches, or aligns near-to-matching, an exposure time identified in the second exposure-time factorization set.
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公开(公告)号：US20230100795A1
公开(公告)日：2023-03-30
申请号：US18062387
申请日：2022-12-06
Applicant: Google LLC
Inventor： Gang Sun , Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
IPC: H04N5/235
Abstract: Techniques and apparatuses are described for reducing a flicker effect of multiple light sources in an image captured with an imaging device. A lighting frequency associated with each of the multiple light sources is detected and prioritized relative to a flicker effect upon the image to identify at least a first-prioritized lighting frequency and a second-prioritized lighting frequency. A first exposure-time factorization set is determined for the first-prioritized lighting frequency, and a second exposure-time factorization set is determined for the second-prioritized lighting frequency. An exposure time of the imaging device is adjusted to an exposure time identified in the first exposure-time factorization set that matches, or aligns near-to-matching, an exposure time identified in the second exposure-time factorization set.
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Patent Agency Ranking
公开(公告)号：US20220191374A1
公开(公告)日：2022-06-16
申请号：US17439762
申请日：2019-09-25
Applicant: Google LLC
Inventor： Adarsh Prakash Murthy Kowdle , Ruben Manuel Velarde , Zhijun He , Xu Han , Kourosh Derakshan , Shahram Izadi
Abstract: This document describes techniques and systems that enable automatic exposure and gain control for face authentication. The techniques and systems include a user device initializing a gain for a near-infrared camera system using a default gain. The user device ascertains patch-mean statistics of one or more regions-of-interest of a most-recently captured image that was captured by the near-infrared camera system. The user device computes an update in the initialized gain to provide an updated gain that is usable to scale the one or more regions-of-interest toward a target mean-luminance value. The user device dampens the updated gain by using hysteresis. Then, the user device sets the initialized gain for the near-infrared camera system to the dampened updated gain.
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公开(公告)号：US20220006940A1
公开(公告)日：2022-01-06
申请号：US17447816
申请日：2021-09-16
Applicant: Google LLC
Inventor： Jinglun Gao , Lin Lu , Gang Sun , Szepo Hung , Ruben Manuel Velarde
IPC: H04N5/235
Abstract: A method includes detecting, based on sensor data from a sensor on a mobile device, an environmental brightness measurement, where the mobile device comprises a display screen configured to adjust display brightness based on environmental brightness. The method further includes determining, based on image data from a camera on the mobile device, an extent to which the detected environmental brightness measurement is caused by reflected light from the display screen. The method additionally includes setting a rate of exposure change for the camera based on the determined extent to which the detected environmental brightness measurement is caused by reflected light from the display screen.
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公开(公告)号：US20210112189A1
公开(公告)日：2021-04-15
申请号：US16902623
申请日：2020-06-16
Applicant: Google LLC
Inventor： Gang Sun , Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
IPC: H04N5/235
Abstract: Techniques and apparatuses are described for reducing a flicker effect of multiple light sources in an image captured with an imaging device. A lighting frequency associated with each of the multiple light sources is detected and prioritized relative to a flicker effect upon the image to identify at least a first-prioritized lighting frequency and a second-prioritized lighting frequency. A first exposure-time factorization set is determined for the first-prioritized lighting frequency, and a second exposure-time factorization set is determined for the second-prioritized lighting frequency. An exposure time of the imaging device is adjusted to an exposure time identified in the first exposure-time factorization set that matches, or aligns near-to-matching, an exposure time identified in the second exposure-time factorization set.
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公开(公告)号：US20240348930A1
公开(公告)日：2024-10-17
申请号：US18294093
申请日：2021-08-02
Applicant: Google LLC
Inventor： Yichang Shih , Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
Abstract: This document describes techniques and apparatuses for exposure control for image-capture. The techniques and apparatuses utilize sensor data to analyze a scene and, based on this analysis, determine a likelihood of exposure-related defects in captured images of the scene. Based on this likelihood, the techniques determine multiple different exposure times for multiple image-capture devices. An image-merging module then combines these different images captured with different exposure times to create a single image with reduced exposure-related defects.
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公开(公告)号：US11546524B2
公开(公告)日：2023-01-03
申请号：US17242088
申请日：2021-04-27
Applicant: Google LLC
Inventor： Gang Sun , Jinglun Gao , Ruben Manuel Velarde , Szepo Robert Hung
IPC: H04N5/235
Abstract: Techniques and apparatuses are described for reducing a flicker effect of multiple light sources in an image captured with an imaging device. A lighting frequency associated with each of the multiple light sources is detected and prioritized relative to a flicker effect upon the image to identify at least a first-prioritized lighting frequency and a second-prioritized lighting frequency. A first exposure-time factorization set is determined for the first-prioritized lighting frequency, and a second exposure-time factorization set is determined for the second-prioritized lighting frequency. An exposure time of the imaging device is adjusted to an exposure time identified in the first exposure-time factorization set that matches, or aligns near-to-matching, an exposure time identified in the second exposure-time factorization set.
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