Method and time-of-flight camera for providing distance information

摘要

The invention relates to a method for providing distance information of a scene with a time-of-flight camera (1), comprising the steps of emitting a modulated light pulse towards the scene, receiving reflections of the modulated light pulse from the scene, evaluating a time-of-flight information for the received reflections of the modulated light pulse, and deriving distance information from the time-of-flight information for the received reflections, whereby a spread spectrum signal is applied to a base frequency of the modulation of the light pulse, and the time-of-flight information is evaluated under consideration of the a spread spectrum signal applied to the base frequency of the modulation of the light pulse. The invention further relates to a time-of-flight camera (1) for providing distance information from a scene, whereby the time-of-flight camera (1) performs the above method.

主权项

1. A method for providing distance information of a scene with a time-of-flight sensor or camera, comprising the steps of:
emitting a periodic light signal towards the scene in accordance with a modulation signal based on a clock timing that has a base frequency spread by a periodic perturbation with a perturbation frequency and period, receiving reflections of the periodic light signal from the scene, evaluating a time-of-flight information for the received reflections of the periodic light signal over a set of a plurality of measurement durations in accordance with the modulation signal, and deriving distance information from the time-of-flight information for the received reflections, wherein each measurement duration of the set is an integer or half integer multiple of the perturbation period and over the set of measurement durations the average base frequency is kept constant.