| US 7,463,157 B2 | ||
| Method and system for recognizing driver impairment | ||
| Trent Victor, Göteborg (Sweden); and Petter Larsson, Ytterby (Sweden) | ||
| Assigned to Volvo Technology Corp., Gothenburg (Sweden) | ||
| Filed on May 30, 2006, as Appl. No. 11/420,864. | ||
| Application 11/420864 is a continuation of application No. PCT/EP03/13480, filed on Nov. 30, 2003. | ||
| Prior Publication US 2007/0008151 A1, Jan. 11, 2007 | ||
| Int. Cl. G08B 23/00 (2006.01) | ||
| U.S. Cl. 340—576 [340/573.1; 340/439; 340/575; 180/272] | 32 Claims |
| 1. Method for recognizing and/or detecting impairment and/or inattention of a person by detecting and evaluating head movements
of the person on the basis of at least one component, the at least one component being at east one of three head rotation
components, pitch, yaw, roll, and three head translation components, each in one of three orthogonal directions, the method
comprising the following steps:
calculating within at least one predetermined time interval an actual density pattern of the at least one component in a form
of an actual distribution of numbers of samples of the at least one component between at least one of a normal region and
a normal region center point, which includes a peak of the density pattern, and a plurality of pre-set outer normal regions
surrounding the at least one of the normal region and normal region center point;
comparing the actual density pattern with a reference density pattern of the at least one component in a form of a reference
distribution of samples of the at least one component in the at least one of the normal region and normal region center point;
and
evaluating a difference between at least one one of actual and reference patterns and actual and reference distributions and
outputting a signal if the difference exceeds a predetermined value.
|