发明名称 |
Navigation assistance based on visual codes |
摘要 |
Visual codes are scanned to assist navigation. The visual code may be a Quick Response (QR) code that contains information useful to calibrating a variety of navigation-based sensors such as gyroscopes, e-compasses, and barometric pressure sensors. In an embodiment, an imaging device, an e-compass, an accelerometer, and a processor are elements of a system. The processor is coupled to the imaging device, the e-compass, and the accelerometer. The processor causes the imaging device to scan a visual code, read a yaw angle from the visual code, and computes an estimate of a yaw angle based on magnetic field measurements taken by the e-compass. The processor generates scale factors and biases determined from measurements generated by the e-compass. Based on scanning the visual code, the processor computes a quality factor based on the yaw angle read from the visual code and the estimate of the yaw angle. |
申请公布号 |
US9557172(B2) |
申请公布日期 |
2017.01.31 |
申请号 |
US201615054252 |
申请日期 |
2016.02.26 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
Waters Deric Wayne;Pande Tarkesh |
分类号 |
G01C17/38;G01C5/06;G06F17/30;G01C17/02;G01P15/00;G06K7/10;G06K19/06 |
主分类号 |
G01C17/38 |
代理机构 |
|
代理人 |
Liu Kenneth;Brill Charles A.;Cimino Frank D. |
主权项 |
1. A system, comprising:
an imaging device; an e-compass; an accelerometer; and a processor coupled to the imaging device, the e-compass, and the accelerometer, wherein the processor causes the imaging device to scan a visual code, read a yaw angle from the visual code, and compute an estimate of a yaw angle based on magnetic field measurements taken by the e-compass and scale factors and biases determined from measurements generated by the e-compass; wherein, based on scanning the visual code, the processor computes a quality factor based on the yaw angle read from the visual code and the estimate of the yaw angle. |
地址 |
Dallas TX US |