Several important pattern recognition applications are based on feature extraction and vector clustering. Directional patterns may be represented by rotation-variant directional vectors, formed from M features uniformly extracted in M directions. It is often required that pattern recognition algorithms are invariant under pattern rotation or, equivalently, invariant under circular shifts of suc...

In this paper, a method for parameterizing orthogonal wavelet transforms is presented. The parameter space is given by the rotation angles of the orthogonal 2 2 rotations used in the lattice filters realizing the stages of the wavelet transform. Different properties of orthogonal wavelet transforms can be expressed in this parameter space. Then, the parameter space is restricted to the set of r...

During some gravitational lensing events, the lens transits the face of the star. This causes a shift in the apparent radial velocity of the star which is proportional to its rotation speed. It also changes the magnification relative to what would be expected for a point source. By measuring both effects, one can determine the rotation parameter v sin i. The method is especially useful for K gi...

BACKGROUND Several trials have compared the clinical results between anatomic double-bundle and single-bundle anterior cruciate ligament reconstruction procedures. However, it remains controversial whether the anatomic double-bundle procedure is superior to the single-bundle procedure. HYPOTHESIS The anatomic double-bundle procedure will be better than the single-bundle procedure at resisting...

Registration between two images is a key problem in computer vision. Current methods tend to separate the scale estimation process from translation and rotation estimation. This is due to the fact that the scale parameter is inherently related to the image resolution. In this paper, we present an area-based image registration technique that can simultaneously estimate translation, rotation, and...

| In this paper a method for parameterizing orthogonal wavelet transforms is presented. The parameter space is given by the rotation angles of the orthogonal 22{ rotations used in the lattice lters realizing the stages of the wavelet transform. Diierent properties of orthogonal wave-let transforms can be expressed in this parameter space. Then, the parameter space is restricted to the set of ro...

The interaction of light with rotating media has attracted recent interest for both fundamental and applied studies including rotational Doppler shift measurements. It is also possible to obtain amplification through the scattering of light with orbital angular momentum from a rotating and absorbing cylinder, as proposed by Zel'dovich more than forty years ago. This amplification mechanism has ...

CORDIC based IIR digital lters possess desirable properties for VLSI implementations such as regularity, local connection, low sensitivity to nite word-length implementation, and elimination of limit cycles. Recently, ne-grain pipelined CORDIC based IIR digital lter architectures which can perform the ltering operations at arbitrarily high sample rates at the cost of linear increase in hardware...

OBJECTIVES Previous research has produced conflicting evidence on the relative merits of advancing and delaying shift systems. The current study assessed the effects of the direction of shift rotation within 8 hour systems, upon a range of measures including sleep, on shift alertness, physical health, and psychological wellbeing. METHODS An abridged version of the standard shiftwork index whi...

Objectives—Previous research has produced conflicting evidence on the relative merits of advancing and delaying shift systems. The current study assessed the eVects of the direction of shift rotation within 8 hour systems, upon a range of measures including sleep, on shift alertness, physical health, and psychological wellbeing. Methods—An abridged version of the standard shiftwork index which ...