| CPC G06T 7/521 (2017.01) [G06F 18/2134 (2023.01); G06F 18/2137 (2023.01); G06V 10/75 (2022.01); G06V 10/751 (2022.01); G06T 2207/20041 (2013.01)] | 18 Claims |
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1. A method of generating a matrix of points and a look-up table for use in phase unwrapping, the method comprising:
generating a plurality of phase order sets from a reference phase vector in K-dimensional space by a stochastic process, the reference phase vector describing an evolution of phase with distance for K frequencies of amplitude modulated light;
based on the plurality of phase order sets, generating a corresponding plurality of parallel lines in K-dimensional space, each parallel line having a point corresponding to a phase order set and a slope parallel to the reference phase vector;
projecting the plurality of parallel lines onto a lower dimensional plane in the K-dimensional space, thereby forming a matrix of points from intersections of the parallel lines with the lower dimensional plane;
plotting independent terms through the matrix of points;
generating a look-up table that identifies a phase order set based on two or more of the independent terms;
storing the matrix of points and the look-up table for use in phase unwrapping; and
performing phase unwrapping by
receiving a noisy phase point comprising K phase measurements from a time-of-flight pixel,
determining a location at which a projection line that passes through the noisy phase point in K-dimensional phase space also passes through the lower dimensional plane in the K-dimensional phase space, the projection line being parallel to the reference phase vector,
comparing the location to the independent terms plotted through the matrix of points and selecting a set of independent terms,
determining a phase order set by using the set of independent terms to reference the look-up table,
determining a distance value based on the phase order set, and
outputting the distance value for the time-of-flight pixel.
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