Results 171 to 180 of about 1,353 (200)

Considerations in the autocalibration of quadrature receivers

1995 International Conference on Acoustics, Speech, and Signal Processing, 2002
This paper develops a calibration procedure for gain and phase imbalances in quadrature receivers. Quadrature demodulation has many applications in communications and array processing. Frequently, the output of the in-phase (I) and quadrature (Q) channels are considered the real and imaginary parts, respectively, of a complex random process which ...
John W. Pierre, Daniel R. Fuhrmann
openaire   +1 more source

The Eye's Mechanisms for Autocalibration

Optics and Photonics News, 2002
As those of us who build optical instruments are all too aware, changes in the environment surrounding an instrument or changes within the instrument itself can quickly throw it out of calibration. This usually requires someone to intervene and restore the device to its calibrated state.
Heidi Hofer, David R. Williams
openaire   +1 more source

Autocalibration of Triaxial MEMS Accelerometers With Automatic Sensor Model Selection

IEEE Sensors Journal, 2012
Up to now, little attention has been posed on a principled derivation of the cost function used for autocalibration of MEMS tri-axial accelerometers. By formulating the calibration problem in the context of maximum likelihood estimate, we derive here a ...
I Frosio, Federico Pedersini, N Alberto Borghese   +2 more
exaly   +2 more sources

Autocalibration for Structure from Motion

Computer Vision and Image Understanding, 2017
Calibration pipeline that propagates calibration information to uncalibrated images.Estimated calibration includes focal length, distortion center and distortion parameter.Bigger datasets may be used and optimization step in SfM is more likely to converge without getting stuck in local minima.
openaire   +1 more source

Real-Time Autocalibration of MEMS Accelerometers

IEEE Transactions on Instrumentation and Measurement, 2014
In this paper, the self-calibration of micromechanical acceleration sensors is considered, specifically, based solely on user-generated movement data without the support of laboratory equipment or external sources. The autocalibration algorithm itself uses the fact that under static conditions, the squared norm of the measured sensor signal should ...
Glueck, Manuel, Oshinubi, Dayo, Schopp, Patrick, Manoli, Yiannos   +3 more
openaire   +2 more sources

Autocalibrating segmented diffusion‐weighted acquisitions

Magnetic Resonance in Medicine, 2021
PurposeSegmented echo‐planar imaging enables high‐resolution diffusion‐weighted imaging (DWI). However, phase differences between segments can lead to severe artifacts. This work investigates an algorithm to enable reconstruction of interleaved segmented acquisitions without the need of additional calibration or navigator measurements.MethodsA parallel
openaire   +2 more sources

Autocalibration for virtual environments tracking hardware

Proceedings of the 20th annual conference on Computer graphics and interactive techniques, 1993
We describe two instances in which precise mechanical calibration of virtual environments equipment has been replaced by automated algorithmic calibration through software that encapsulates the hardware design and uses a goal-based approach to adjust calibration parameters.
Stefan Gottschalk, John F. Hughes
openaire   +1 more source

Autocalibration of an electronic compass for augmented reality

Fourth IEEE and ACM International Symposium on Mixed and Augmented Reality (ISMAR'05), 2005
Electronic compass is often used to provide the absolute heading reference for tracking the user's head and hands in virtual reality (VR) and augmented reality (AR), especially for outdoor AR applications. However, compass is vulnerable to environment magnetism disturbance.
Xiaoming Hu 0001, Yue Liu 0005, Yongtian Wang, Yanling Hu, Dayuan Yan   +4 more
openaire   +1 more source

A Minimal Solution to Radial Distortion Autocalibration

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2011
Simultaneous estimation of radial distortion, epipolar geometry, and relative camera pose can be formulated as a minimal problem and solved from a minimal number of image points. Finding the solution to this problem leads to solving a system of algebraic equations.
Zuzana Kukelova, Tomás Pajdla
openaire   +2 more sources

Online Camera-Gyroscope Autocalibration for Cell Phones

IEEE Transactions on Image Processing, 2014
The gyroscope is playing a key role in helping estimate 3D camera rotation for various vision applications on cell phones, including video stabilization and feature tracking. Successful fusion of gyroscope and camera data requires that the camera, gyroscope, and their relative pose to be calibrated. In addition, the timestamps of gyroscope readings and
Chao Jia, Brian L. Evans
openaire   +2 more sources