Hybrid autofocus system by using a combination of the sensor-based phase-difference detection and focus-aid signal

We proposed a hybrid autofocus (AF) system for achieving an accurate and fast focus control of the 8K super Hi-vision television camera. The proposed method combines the sensor-based phase-difference detection AF (PDAF) with focus-aid (FA) signal, facilitating precise focusing with a low-resolution viewfinder. The concept was physically implemented in an 8K camera system. The experimental results showed that the FA signal information secured an accurate AF, and the PDAF improved the AF acquisition time without unwanted lens hunting phenomenon.