Massachusetts Institute of Technology

Waikatolink Limited

Walkatolink Limited

The University of Waikato

Lee Vincent Streeter

Adrian Andrew Dorrington

Ramesh Raskar

Achuta Kadambi

Ayush Bhandari

Christopher Barsi

Andrew Dean Payne

Refael Whyte

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.

Signal harmonic error cancellation method and apparatus

In illustrative implementations, a time-of-flight camera robustly measures scene depths, despite multipath interference. The camera emits amplitude modulated light. An FPGA sends at least two electrical signals, the first being to control modulation of radiant power of a light source and the second being a reference signal to control modulation of pixel gain in a light sensor. These signals are identical, except for time delays. These signals comprise binary codes that are m-sequences or other broadband codes. The correlation waveform is not sinusoidal. During measurements, only one fundamental modulation frequency is used. One or more computer processors solve a linear system by deconvolution, in order to recover an environmental function. Sparse deconvolution is used if the scene has only a few objects at a finite depth. Another algorithm, such as Wiener deconvolution, is used is the scene has global illumination or a scattering media.

Methods and apparatus for coded time-of-flight camera

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.

Motion compensation in range imaging

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Hamilton, New Zealand

Lee Vincent Streeter