Method for corrected depth measurement with a time-of-flight camera using amplitude-modulated continuous light

US11263765B2 · kind B2 · utility

Assignee

• IEE INTERNATIONAL ELECTRONICS & ENGINEERING S.A. · LU

Inventors

• Bruno Mirbach · Konz, DE
• Harald Clos · Saarburg, DE
• Martin BOGUSLAWSKI · Trier, DE
• Thomas Solignac · Mondelange, FR

Key dates

• Filing date: Dec 3, 2019
• Grant date: Mar 1, 2022
• Expiry date: Dec 3, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/10028
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for corrected depth measurement with a time-of-flight camera using amplitude-modulated continuous light. In order to enable an accurate and efficient depth measurement with a time-of-flight camera, the method includes, for each of a plurality of pixels of a sensor array of the camera: acquiring with the camera a raw depth value rm for the pixel; and automatically calculating a ground truth value rt according to: rt=g(rm−cm)+ct, to correct a systematic depth error of the raw depth value rm, wherein cm is a pixel-dependent first offset, g is a pixel-independent first function and ct is a pixel-independent second offset.