Abstract
Devices may be used to capture images and videos. For example, a device may include one or more cameras (e.g., image sensors) to capture images and videos of people. When capturing an image or video of a person, exposure parameters for the person’s face may be prioritized by (i) calculating the luma for the facial region and (ii) adjusting the exposure parameters based on an average luma value across the facial region.
Typically, a small region of interest is used to calculate the luma for the facial region. For example, the region of interest may be an initial facial area (e.g., an initial facial region of interest), such as from the mouth to the eyes. However, in some scenarios where overhead lighting is relatively strong (e.g., bright), and this initial facial region of interest is expanded to include areas like the forehead, the inclusion of very bright spots (e.g., a bright forehead) in luma calculations can lead to underexposed (dark) faces because the overall calculated luma is too high, signaling a need for lower exposure.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Greer, Alex William; Yin, Ariel Chiati; Lu, Lin; and Hung, Hsing Ju, "Selective Use of Expanded Region of Interest for Luma-Based Exposure Determination", Technical Disclosure Commons, (July 01, 2025)
https://www.tdcommons.org/dpubs_series/8297