Results 161 to 170 of about 1,353 (200)

Using Ecological Momentary Assessment to Examine Predictors of Motivation for Physical Activity in Older Adults. [PDF]

Res Health Med
Banarjee C, Xie R, Chen C, Lopez J, Thiamwong L.   +4 more
europepmc   +1 more source

An Efficient Autocalibration Method for Triaxial Accelerometer

IEEE Transactions on Instrumentation and Measurement, 2017
This paper investigates the autocalibration of microelectromechanical systems (MEMS) triaxial accelerometer (TA) based on experimental design (DoE). First, for a special 6-parameter second-degree model, a six-point experimental scheme is proposed, and its G-optimality has been proven based on optimal DoE.
Lin Ye, Ying Guo, Steven W Su
exaly   +3 more sources

Autocalibration of MEMS Accelerometer

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings, 2006
In this paper a new approach of an auto calibration method for micromechanical sensors is proposed. In particular, recalibration of acceleration sensors without any additional laboratory equipment is considered. If the device is stationary, the proposed procedure exploits the fact that the output vector of the acceleration sensor should match the ...
I. Frosio, F. Pedersini, N. A. Borghese
core   +4 more sources

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Maximum likelihood autocalibration

Image and Vision Computing, 2011
This paper addresses the problem of autocalibration, which is a critical step in existing uncalibrated structure from motion algorithms that utilize an initialization to avoid the local minima in metric bundle adjustment. Currently, all known direct (not non-linear) solutions to the uncalibrated structure from motion problem solve for a projective ...
Wesley E Snyder, Jan-Michaél Frahm
exaly   +2 more sources

Globally convergent autocalibration

Proceedings Ninth IEEE International Conference on Computer Vision, 2003
Existing autocalibration techniques use numerical optimization algorithms that are prone to the problem of local minima. To address this problem, we have developed a method where an interval branch-and-bound method is employed for numerical minimization.
Benedetti, A., Busti, A., Farenzena, M, FUSIELLO, Andrea   +3 more
openaire   +3 more sources

Autocalibration of silicon Hall devices

Sensors and Actuators A: Physical, 1996
A novel method of eliminating sensor defects is presented. The autocalibration method uses an on-chip actuator to generate reference signals to correct the sensor characteristics, ensuring reliable and accurate measurements. Autocalibration also eliminates the necessity of calibration at manufacturing, or during the lifetime of the sensor.
S Middelhoek
exaly   +2 more sources

Autocalibration algorithm for ultrasonic location systems

Seventh IEEE International Symposium on Wearable Computers, 2003. Proceedings., 2004
As mobile and wearable technology has evolved, an increasingneed for indoor positioning has arisen. In particular,the use of ultrasonics provides a cheap way to fulfil thisneed. However, current ultrasonic location systems have tobe calibrated manually by providing information about theexact positions of the transmitters used.
Duff, PA, Muller, HL
openaire   +3 more sources

Globally convergent autocalibration using interval analysis

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2004
We address the problem of autocalibration of a moving camera with unknown constant intrinsic parameters. Existing autocalibration techniques use numerical optimization algorithms whose convergence to the correct result cannot be guaranteed, in general ...
Andrea Fusiello, M Farenzena
exaly   +2 more sources

Bayesian autocalibration for surveillance

Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1, 2005
In the context of visual surveillance of human activity knowledge about a camera's internal and external parameters is useful, as it allows for the establishment of a connection between image and world measurements. Unfortunately, calibration information is rarely available and difficult to obtain after a surveillance system has been installed. In this
Nils Krahnstoever, Paulo R. S. Mendonça
openaire   +1 more source

Autocalibration of a projector-camera system

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2005
This paper presents a method for calibrating a projector-camera system that consists of multiple projectors (or multiple poses of a single projector), a camera, and a planar screen. We consider the problem of estimating the homography between the screen and the image plane of the camera or the screen-camera homography, in the case where there is no ...
Takayuki Okatani, Koichiro Deguchi
openaire   +2 more sources