Patent · US Expired

Head motion estimation from four feature points

US7027618B2 · kind B2 · utility

14Cited by

3References

25Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Miroslav Trajkovic · Ossining, US
Vasanth Philomin · Stolberg, DE
Srinivas Gutta · Buchanan, US

Key dates

Filing date	Sep 28, 2001
Grant date	Apr 11, 2006
Priority date	—
Expiry date	Nov 14, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG06T7/74
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

Linear method for performing head motion estimation from facial feature data, the method comprising the steps of: obtaining first facial image and detecting a head in the first image; detecting position of four points P of said first facial image where P={p1, p2, p3, p4}, and pk=(xk, yk); obtaining second facial image and detecting a head in the second image; detecting position of four points P′ of the second facial image where P′={p′1, p′2, p′3, p′4} and p′k=(x′k, y′k); and, determining the motion of the head represented by a rotation matrix R and translation vector T using the points P and P′.The head motion estimation is governed according to an equation:P′i=RPi+T,where and T=[T1 T2 T3]T represents camera rotation and translation respectively.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.