Qingxiu Du

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Low cost inertial/magnetic sensors are typically used for AHRS (attitude and heading reference systems) to determine sensor attitudes in navigation systems. Sensor calibration procedures are very critical to achieve precise attitude reconstruction. This paper is focused on calibration of errors caused by sensors deviations from drift, sensitivity,(More)
In this paper, an attitude tracking method considering acceleration compensation and based on UKF is proposed for measurement units integrating gyroscopes, accelerometers and magnetic sensors. Main characteristics of this method include: 1) the translational acceleration vector is combined with the quaternion describing attitude and the aggregate error(More)
This paper introduces an arm motion perception and interaction platform using motion perception and touch/force interaction devices (wireless data glove, inertial tracking unit and force feedback device). The platform implements finger bend sensing, three dimensional motion tracking, and is able to feed back force to operator's hand on condition that it(More)
In digital image watermark applications, most of watermark algorithms are vulnerable to geometrical affine transformation attacks. In order to resist affine transformation attacks, we propose a correlation coefficient based algorithm, which uses the original image to estimate affine parameters and recover the affine transformed image before watermark(More)
Real-Time human motion tracking with Inertial/Magnetic sensors is a key technology in human-computer interaction applications. A computationally efficient and robust algorithm for estimating orientation is critical. This paper gives a quaternion-based orientation tracking algorithm for human motion tracking with a triaxial angular rate sensor, a triaxial(More)
In most of the existing shot boundary detection algorithms, the false/miss detection problem caused by motion is very serious. In this paper, firstly, we propose a new spatio-temporal slice called projected spatio-temporal slice (PSTS) that can effectively eliminate disturbance caused by motion. Then we present approaches for detecting camera cuts, fades(More)
In recent years, digital watermarking technologies are considered to be important means to protect digital image copyrights. In this paper, we combine a non-invertible watermark scheme with an HVS model adaptive watermark. The application of adaptive watermarks improves visual imperceptibility. However, we find that an adversary is able to apply ambiguity(More)
In MPEG-2 to H.264 cascaded transcoder, the transcoding speed is mainly affected by computational complexity of H.264 encoder. Especially, motion estimation module of the encoder costs much time due to multiple motion-compensated prediction modes of H.264. In this paper, in order to speed up the transcoding and achieve good video quality, we propose a new(More)
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