公开(公告)号：US12046072B2

公开(公告)日：2024-07-23

申请号：US17437395

申请日：2019-10-10

Applicant: Google LLC

Inventor： Zhijun He ,  Wen Yu Chien ,  Po-Jen Chang ,  Xu Han ,  Adarsh Prakash Murthy Kowdle ,  Jae Min Purvis ,  Lu Gao ,  Gopal Parupudi ,  Clayton Merrill Kimber

IPC: G06V40/16 ,  G06V10/10 ,  G06V40/00 ,  H04N5/04 ,  H04N23/56 ,  H04N23/66

CPC classification number: G06V40/166 ,  G06V10/10 ,  G06V40/16 ,  G06V40/172 ,  G06V40/179 ,  H04N5/04 ,  H04N23/56 ,  H04N23/66

Abstract: This disclosure describes systems and techniques for synchronizing cameras and tagging images for face authentication. For face authentication by a facial recognition model, a dual infrared camera may generate an image stream by alternating between capturing a “flood image” and a “dot image” and tagging each image with metadata that indicates whether the image is a flood or a dot image. Accurately tagging images can be difficult due to dropped frames and errors in metadata tags. The disclosed systems and techniques provide for the improved synchronization of cameras and tagging of images to promote accurate facial recognition.

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

IPC: H04N5/235 ,  G06F21/32 ,  G06V10/25 ,  H04N5/33

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.

公开(公告)号：US20220172511A1

公开(公告)日：2022-06-02

申请号：US17437395

申请日：2019-10-10

Applicant: Google LLC

Inventor： Zhijun He ,  Wen Yu Chien ,  Po-Jen Chang ,  Xu Han ,  Adarsh Prakash Murthy Kowdle ,  Jae Min Purvis ,  Lu Gao ,  Gopal Parupudi ,  Clayton Merrill Kimber

IPC: G06V40/16 ,  H04N5/225 ,  H04N5/04 ,  H04N5/232

Abstract: This disclosure describes systems and techniques for synchronizing cameras and tagging images for face authentication. For face authentication by a facial recognition model, a dual infrared camera may generate an image stream by alternating between capturing a “flood image” and a “dot image” and tagging each image with metadata that indicates whether the image is a flood or a dot image. Accurately tagging images can be difficult due to dropped frames and errors in metadata tags. The disclosed systems and techniques provide for the improved synchronization of cameras and tagging of images to promote accurate facial recognition.

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

IPC: G06F21/32 ,  H04N5/33 ,  H04N23/72 ,  H04N23/71 ,  G06V10/22 ,  G06V10/143 ,  G06V40/16

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.