DNN-Assisted Autocorrelation-Based Preamble Detection for Symbol Synchronization of Image Overlay Screen Camera Communication

Image overlay uplink screen camera communication consists of a small screen with LED backlight modulation and a rolling shutter telephoto camera. In a previous study on symbol synchronization-object detection deep neural network (DNN) detected the screen- and autocorrelation detected the preamble separately. However-both object detection DNN and autocorrelation can detect the preamble. First-in this study, object detection DNN detects the screen and preamble. Next, autocorrelation precisely detects the preamble assisted with object detection DNN, improving the efficiency and accuracy of preamble detection. Also, preamble pattern suitable for object detection DNN is revealed.