2023 AOSP and AAOS November Meetup: Measure and investigate the glass to glass latency in Android

Stefan Lengfeld from Inovex asks: what is the glass to glass latency in Android? How much delay is there between the camera, taking a picture, and the screen, to display the picture again. This presentation is a technical tour through the Android graphics system and hardware. From the measurement setup, based on cables, LEDs, photodiodes and an oscilloscope, to camera sensors and the rolling shutter effect, to displays and refresh rates, to surfaceflinger and vsyncs, and last but not least to the ultimate tool to debug most of your performance issues, to Android's systrace