Flicker reduction method for 120 fps shooting under 100 Hz light fluctuation by using a double rolling shutter

Kohei Tomioka; Toshio Yasue; Ryohei Funatsu; Kodai Kikuchi; Kazuya Kitamura; Yuichi Kusakabe; Tomoki Matsubara

doi:10.1117/12.2527961

6 September 2019 Flicker reduction method for 120 fps shooting under 100 Hz light fluctuation by using a double rolling shutter

Kohei Tomioka, Toshio Yasue, Ryohei Funatsu, Kodai Kikuchi, Kazuya Kitamura, Yuichi Kusakabe, Tomoki Matsubara

Author Affiliations +

Proceedings Volume 11137, Applications of Digital Image Processing XLII; 111370V (2019) https://doi.org/10.1117/12.2527961
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

This study proposes a flicker reduction method for 120 fps shooting under 100 Hz light fluctuation. In 120 fps videos, a 100 Hz light fluctuation causes a 20 Hz flicker, which is an aliasing artifact induced by its sampling frequency. In this method, the frame period of 1/120 s is divided into 1/150 s and 1/600 s exposure by using a double rolling shutter. Each pixel alternatively outputs 1/150 s and 1/600 s exposure signals which are readout by a readout circuit operated at double the rate of a normal 120 fps operation. A 120 fps signal with an exposure time of 1/100 s is obtained by summing three consecutive signals with exposures of 1/600, 1/150, and 1/600 s. This method is effective for flicker reduction even in the presence of several light sources with different amplitudes and phases. We implemented this method to an 8K camera and examined the flicker reduction effect for an 8K 120 fps video. As a result, the 20 Hz flicker was suppressed to less than one-tenth.

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Kohei Tomioka, Toshio Yasue, Ryohei Funatsu, Kodai Kikuchi, Kazuya Kitamura, Yuichi Kusakabe, and Tomoki Matsubara "Flicker reduction method for 120 fps shooting under 100 Hz light fluctuation by using a double rolling shutter", Proc. SPIE 11137, Applications of Digital Image Processing XLII, 111370V (6 September 2019); https://doi.org/10.1117/12.2527961

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KEYWORDS

Signal processing

Camera shutters

Cameras

Modulation transfer functions

Video

Light sources

Imaging systems

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