Abstract
This disclosure describes autofocus (AF) techniques that leverage multiple exposures of phase detection (PD) data to ensure that all relevant regions of interest in an image benefit from the highest possible PD signal quality while reducing the computational load and latency incurred by the AF module. A single, unified PD raw frame is generated by merging data from multiple exposure contexts. Raw PD data is blended within the front-end of the image signal processor (ISP) or similar low-level layer, obviating extensive preprocessing to determine the optimal PD source. Enhancement in autofocus quality is achieved especially for dark objects in high dynamic range scenarios. The improvement is achieved through a carefully balanced blending of PD signals from both long and short exposure frames.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Hwang, Sunghyun; Chan, Ryan; and Lee, Dajung, "Multiple Exposure Phase Detection Blending for Autofocus Cameras", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/9222