Systems and methods for automatic exposure in high dynamic range video capture systems
AssigneeGoogle Inc.
InventorsWilliam Duran, Adrian Proca
Life of this patent
Estimating the term…
Abstract
The various implementations described herein include methods, devices, and systems for implementing high dynamic range and automatic exposure functions in a video system. In one aspect, a method is performed at a video camera device and includes, while operating in a non-high dynamic range (HDR) mode: capturing first video data of a scene with the image sensor; determining whether a minimum number of pixels of the first video data meets one or more first color intensity criteria; and in accordance with the determination that the minimum number of pixels of the first video data meets the one or more first color intensity criteria, switching operation from the non-HDR mode to an HDR mode.
Claims20
A method performed at a video camera device having memory, one or more processors, and an image sensor, the method comprising:
- while operating in a high dynamic range-mode (HDR-mode):
- capturing a first subset of video data with a first exposure time;
- and
- capturing a second subset of the video data with a second exposure time that is lower than the first exposure time;
- combining the first subset of the video data and the second subset of the video data to generate an HDR frame;
- determining whether pixels of a particular color in the HDR frame originated from the second subset of the video data;
- determining that a first number of pixels meets one or more first criteria;
- and
- based on the first number of pixels meeting the one or more first criteria, operating the video camera device in a non-HDR mode.
A video camera device, comprising:
- one or more processors;
- an image sensor;
- memory comprising instructions executable by the one or more processors to configure the video camera device to:
- while operating in a high dynamic range-mode (HDR-mode):
- capture a first subset of video data with a first exposure time;
- and
- capture a second subset of the video data with a second exposure time that is lower than the first exposure time;
- combine the first subset of the video data and the second subset of the video data to generate an HDR frame;
- determine whether pixels of a particular color in the HDR frame originated from the second subset of the video data;
- determine that a first number of pixels meets one or more first criteria;
- and
- based on the first number of pixels meeting the one or more first criteria, operate the video camera device in a non-HDR mode.
Dependencies are inferred from the claim text.