Motion direction determination and application

A mobile device comprising:

• one or more sensors configured to measure acceleration data for the mobile device in each of one or more directions;
• one or more processors;
• and
• a memory storing instructions that, when executed by the one or more processors, implement a plurality of modules including:
• a plurality of motion direction estimation modules configured to calculate a plurality of respective estimated motion directions for the mobile device relative to a coordinate system, each of the motion direction estimation modules being configured to use a respective set of parameters, each motion direction estimation module being configured to calculate the respective estimated motion direction based at least in part on the acceleration data and the respective set of parameters;
• a plurality of reliability metric computation modules configured to determine a plurality of respective reliability metrics the respective estimated motion directions;
• and
• a selection module configured to:
• identify the reliability metric that indicates the greatest reliability;
• identify the motion direction corresponding to the identified reliability metric;
• and
• generate a resultant motion direction based at least in part on the identified reliability metric.

Tangible computer-readable storage media including non-transitory instructions that, when executed by one or more processors, are configured to:

• receive acceleration data for a mobile device in each of one or more directions;
• calculate, by a plurality of motion direction estimation modules, a plurality of respective estimated motion directions for the mobile device relative to a coordinate system, each of the motion direction estimation modules using a respective set of parameters, each motion direction estimation module calculating the respective estimated motion direction based at least in part on the acceleration data and the respective set of parameters;
• determine a reliability metric for each of the estimated motion directions;
• identify the reliability metric that indicates the greatest reliability;
• identify the motion direction corresponding to the identified reliability metric;
• and
• generate a resultant motion direction based at least in part on the identified reliability metric.

An apparatus comprising:

• means for obtaining acceleration data for the apparatus in each of one or more directions;
• means for calculating, by a plurality of motion direction estimation means executing within the apparatus, a plurality of respective estimated motion directions for the apparatus relative to a coordinate system, each of the motion direction estimation means using a respective set of parameters, each motion direction estimation means calculating the respective estimated motion direction based at least in part on the acceleration data and the respective set of parameters;
• means for determining a reliability metric for each of the estimated motion directions;
• means for identifying the reliability metric that indicates the greatest reliability;
• means for identifying the motion direction corresponding to the identified reliability metric;
• and
• means for generating a resultant motion direction based at least in part on the identified reliability metric.