Selective LED Flicker Detection and Mitigation Algorithm for Non-HDR Video Sequences

Nicolai Behmann, Holger Blume, Gregor Schewior, Sebastian Hesselbarth

Abstract: With the rise of pulse-width modulated LED light sources in car headlights and peripheral illumination, in-vehicle cameras for traffic sign recognition and electronic mirror replacement face new issues with flicker artifacts due to misaligned irradiation and imager integration times. In this paper, we propose a novel post-processing algorithm based on three consecutive frames, being able to detect and filter those artifacts without the need for high-dynamic range imaging. The local reconstruction of the original light intensity is based on a local flicker detection mask and multiple candidate pixels, generated from bidirectional motion estimation to adjacent frames.