1) Helios紹介. https://thinklucid.com/helios-time-of-flight-tof-camera/
2) Helios Datasheet. https://thinklucid.com/product/heliostime-of-flight-imx556/
3) Helios Tech Brief. https://thinklucid.com/tech-briefs/sony-depthsense-how-it-works/
4) SONYニュースリリース. https://www.sony.co.jp/SonyInfo/News/Press/201706/17-059/index.html 業界最小画素の裏面照射型Time of Flight方式距離画像センサーを開発 (2017/6/17)
5) CAPDテクノロジ. D. Van Nieuwenhove, W. Van der Tempel, R. Grootjans and M. Kuijk. "Time-of-flight Optical Ranging Sensor Based on a Current Assisted Photonic Demodulator" Proceedings Symposium IEEE/LEOS Benelux Chapter, 2006,Eindhoven