Flexible Event Camera Calibration With Blinking Binary Stripes

Abstract

Event cameras report per-pixel brightness changes as a stream of asynchronous events, making them insensitive to the spatial distribution of feature points. Thus, traditional calibration methods, such as checkerboard and circle patterns, are inadequate for precise event camera calibration. Here, we propose an accurate calibration method based on blinking binary stripes to address this limitation. Two binary stripes, which are orthogonal, are displayed on a screen and blink at a specific frequency. The triggered data streams are converted into frames, which are analyzed using the Fourier technique. Thus, the feature points are located from the phase domain, which differs from conventional methods. The superior performance of the proposed method is verified in calibration experiments.