System and Method for Tracking Objects with Projected m-Sequences

摘要

According to embodiments of the present invention are a system and method that use projected structured patterns of light and linear optical sensors for motion tracking. Sensors are capable of recovering two-dimensional location within the projection area, while several sensors can be combined for up to six degrees of freedom tracking. The structure patterns are based on m-sequences, in which any consecutive subsequence of m bits is unique. Both digital and static light sources can be used. The system and method of the present invention enables high-speed, high precision, and low-cost motion tracking for a wide range of applications.

主权项

1. A method of tracking an object affixed to one of a projector and an optical sensor, comprising:
generating an m-sequence comprised of a series of subsequences; projecting a structured light pattern from a projector, forming a projected field,
wherein the structured light pattern is based on the m-sequence; positioning an optical sensor within the projected field to receive a portion of the structured light pattern,
wherein the portion of the structured light pattern received by the sensor contains at least one subsequence of the series of subsequences; generating data with the optical sensor based on the received subsequence, thresholding the data from the optical sensor; transforming the thresholded data into a binary string; determining if the binary string exists in the m-sequence; and calculating a position of the object based on a location of the received subsequence within the structured light pattern.