Abstract: In one aspect the invention provides a method of operating a time of flight camera which includes the steps of capturing a sequence of time of flight camera data frames using a set of step frequency modulation signals to provide a time of flight camera data set, then completing a spectral analysis of the dataset which identifies frequency and phase value pairs indicative of the range of the camera to an object represented in the data frames. Next an estimated camera range value to an object represented in the data frames is determined using the frequency value, then a corrected camera range value is determined using the estimated camera range value and the phase value. A camera output is then provided which identifies the corrected range values of at least one object represented in the data frames of the dataset.

Abstract: In one aspect the invention provides a time of flight camera system which includes a time of flight transmitter arranged to transmit modulated radiation at a target, and a phase adjustment element configured to adjust the phase of a source modulation signal used to modulate the radiation transmitted at the target. This phase adjustment element provides a set of phase separated output signals, each output signal provided having one of a set phase offsets values applied, where at least one of these phase offset values is the cancellation phase value of another member of the set of phase offset values. The camera system also includes an image sensor modulated with the source modulation signal and configured to measure radiation reflected from a target, and a processor arranged to receive the image sensor measurements and being programmed to resolve range information from the measurements received by the image sensor.

Abstract: In one aspect the invention provides a time of flight camera system which includes a time of flight transmitter arranged to transmit modulated radiation at a target, and a phase adjustment element configured to adjust the phase of a source modulation signal used to modulate the radiation transmitted at the target. This phase adjustment element provides a set of phase separated output signals, each output signal provided having one of a set phase offsets values applied, where at least one of these phase offset values is the cancellation phase value of another member of the set of phase offset values. The camera system also includes an image sensor modulated with the source modulation signal and configured to measure radiation reflected from a target, and a processor arranged to receive the image sensor measurements and being programmed to resolve range information from the measurements received by the image sensor.

Abstract: Methods and devices for correcting for motion blur in range cameras without increasing acquisition speed or reducing the overall quality of the distance determinations, by identifying moving objects in a scene and determining the speed and direction of the objects.