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Flicker reduction method for 120 fps shooting under 100 Hz light fluctuation by using a double rolling shutter
Author(s): Kohei Tomioka; Toshio Yasue; Ryohei Funatsu; Kodai Kikuchi; Kazuya Kitamura; Yuichi Kusakabe; Tomoki Matsubara
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Paper 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.

Paper Details

Date Published: 6 September 2019
PDF: 10 pages
Proc. SPIE 11137, Applications of Digital Image Processing XLII, 111370V (6 September 2019); doi: 10.1117/12.2527961
Show Author Affiliations
Kohei Tomioka, NHK Japan Broadcasting Corp. (Japan)
Toshio Yasue, NHK Japan Broadcasting Corp. (Japan)
Ryohei Funatsu, NHK Japan Broadcasting Corp. (Japan)
Kodai Kikuchi, NHK Japan Broadcasting Corp. (Japan)
Kazuya Kitamura, NHK Japan Broadcasting Corp. (Japan)
Yuichi Kusakabe, NHK Japan Broadcasting Corp. (Japan)
Tomoki Matsubara, NHK Japan Broadcasting Corp. (Japan)


Published in SPIE Proceedings Vol. 11137:
Applications of Digital Image Processing XLII
Andrew G. Tescher; Touradj Ebrahimi, Editor(s)

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