Methods and system for cycle recognition in repeated activities by identifying stable and repeatable features

A method for determining metadata of a repeated activity, the method comprising:

• receiving, with a processor, first motion data corresponding to a first plurality of repetitions of the repeated activity, the first motion data including labels identifying time boundaries between each repetition in the first plurality of repetitions;
• identifying, with the processor, a salient segment of the first motion data corresponding to a motion of the repeated activity that occurs in all of the first plurality of repetition by (i) identifying a plurality of candidate segments of the first motion data, each candidate segment in the plurality of candidate segments including a continuous portion of motion data starting from a different time within the first motion data, (ii) determining a respective score for each respective candidate segment in the plurality of candidate segments, the respective score indicating a level of similarity between the respective candidate segment and corresponding segments of each other repetition in the first plurality of repetitions, and (iii) selecting, with the processor, as the salient segment of the first motion data, the respective candidate segment of the plurality of candidate segments having the respective score that indicates a highest level of similarity of all of the plurality of candidate segments;
• and
• storing, in a memory, metadata of the first motion data, the metadata including the salient segment of the first motion data.

A method for recognizing repetitions of a repeated activity, the method comprising:

• storing, in a memory, metadata of first motion data corresponding to a first plurality of repetitions of the repeated activity, the metadata including a salient segment of the first motion data corresponding to a motion of the repeated activity that occurs in all of the first plurality of repetitions;
• receiving, with the processor, second motion data corresponding to a second plurality of repetitions of the repeated activity from a motion sensing system;
• identifying, with the processor, time boundaries between each repetition in the second plurality of repetitions by by (i) detecting at least two segments of the second motion data that are most similar to the salient segment of the first motion data, and (ii) determining at least one of the time boundaries located between the at least two segments of the second motion data;
• and
• outputting, with an output device, the time boundaries between each repetition in the second plurality of repetitions,
• wherein the determining the at least one of the time boundaries includes (i) mapping a continuous portion of the second motion data that extends between two of the at least two segments of the second motion data onto the first motion data using a dynamic time warping algorithm and (ii) determining the at least one of the time boundaries located between the two of the at least two segments of the second motion data, based on the mapping and the labels of the first motion data.