公开(公告)号：US11164337B2

公开(公告)日：2021-11-02

申请号：US16956730

申请日：2019-10-04

Applicant: Google LLC

Inventor： Edward T. Chang ,  Mykhaylo Kurinnyy ,  Zhaowei Wang ,  Jonathan James Taylor

IPC: G06T7/80 ,  G06T7/73 ,  H04N13/239 ,  H04N13/254

Abstract: This document describes techniques and systems that enable autocalibration for multiple cameras using near-infrared (NIR) illuminators. The techniques and systems include a user device that uses NIR images, including dot images and flood images, captured by the multiple cameras. The user device implements an autocalibration module that normalizes the contrast of each image. Then, the autocalibration module detects dot features in the dot images and detects flood features in the flood images. The autocalibration module uses the flood features to disambiguate the dot features in the dot images. Then, the autocalibration module uses the disambiguated dot features to determine new calibration parameters for recalibration of the multiple cameras. In some aspects, the autocalibration module uses the dot images, rather than the flood images, to detect the flood features for disambiguating the dot features.

公开(公告)号：US20210248782A1

公开(公告)日：2021-08-12

申请号：US16956730

申请日：2019-10-04

Applicant: Google LLC

Inventor： Edward T. Chang ,  Mykhaylo Kurinnyy ,  Zhaowei Wang ,  Jonathan James Taylor

IPC: G06T7/80 ,  G06T7/73 ,  H04N13/239 ,  H04N13/254

Abstract: This document describes techniques and systems that enable autocalibration for multiple cameras using near-infrared (NIR) illuminators. The techniques and systems include a user device that uses NIR images, including dot images and flood images, captured by the multiple cameras. The user device implements an autocalibration module that normalizes the contrast of each image. Then, the autocalibration module detects dot features in the dot images and detects flood features in the flood images. The autocalibration module uses the flood features to disambiguate the dot features in the dot images. Then, the autocalibration module uses the disambiguated dot features to determine new calibration parameters for recalibration of the multiple cameras. In some aspects, the autocalibration module uses the dot images, rather than the flood images, to detect the flood features for disambiguating the dot features.