The Problem of Defining the Fourier Transform of a Colour Image. - Stephen J. Sangwine (ICIP (1), 1998)

Hypercomplex Auto-And-Cross-Correlation of Color Images. - Stephen J. Sangwine; Todd A. Ell (ICIP (4), 1999)

Virtual reality tool for visualising RGB colour space using VRML. - Anthony J. Bardos; Stephen J. Sangwine (EUSIPCO, 2000)

Decomposition of 2D Hypercomplex Fourier transforms into pairs of complex fourier transforms. - Todd A. Ell; Stephen J. Sangwine (EUSIPCO, 2000)

Colour-sensitive edge detection using hypercomplex filters. - Carolyn J. Evans; Stephen J. Sangwine; Todd A. Ell (EUSIPCO, 2000)

Hypercomplex Wiener-Khintchine Theorem with Application to Color Image Correlation. - Todd A. Ell; Stephen J. Sangwine (ICIP, 2000)

Hypercomplex Color-Sensitive Smoothing Filters. - Carolyn J. Evans; Stephen J. Sangwine; Todd A. Ell (ICIP, 2000)

Vector Correlation of Color Images. - C. Eddie Moxey; Todd A. Ell; Stephen J. Sangwine (CGIV, 2002)

Mathematical Approaches to Linear Vector Filtering of Color Images. - Stephen J. Sangwine (CGIV, 2002)

Hypercomplex operators and vector correlation. - C. Eddie Moxey; Todd A. Ell; Stephen J. Sangwine (EUSIPCO, 2002)

Linear colour-dependent image filtering based on vector decomposition. - Stephen J. Sangwine; Barnabas N. Gatsheni; Todd A. Ell (EUSIPCO, 2002)

Vector zone plates as test patterns for linear vector filters. - Todd A. Ell; Stephen J. Sangwine (ICIP (2), 2002)

Color-grayscale image registration using hypercomplex phase correlation. - C. Eddie Moxey; Stephen J. Sangwine; Todd A. Ell (ICIP (2), 2002)

Quaternion principal component analysis of color images. - Nicolas Le Bihan; Stephen J. Sangwine (ICIP (1), 2003)

Vector amplification for color-dependent image filtering. - Stephen J. Sangwine; Barnabas N. Gatsheni; Todd A. Ell (ICIP (2), 2003)

Hypercomplex correlation techniques for vector images. - C. Eddie Moxey; Stephen J. Sangwine; Todd A. Ell (IEEE Trans. Signal Process., 2003)

Gray-centered RGB color space. - Stephen J. Sangwine; Todd A. Ell (CGIV, 2004)

Colour-dependent linear vector image filtering. - Stephen J. Sangwine; Todd A. Ell; Barnabas N. Gatsheni (EUSIPCO, 2004)

Quaternion singular value decomposition based on bidiagonalization to a real or complex matrix using quaternion Householder transformations. - Stephen J. Sangwine; Nicolas Le Bihan (Appl. Math. Comput., 2006)

Hypercomplex algebras in digital signal processing: Benefits and drawbacks. - Daniel J. Alfsmann; Heinz G. Göckler; Stephen J. Sangwine; Todd A. Ell (EUSIPCO, 2007)

Exact Principal Geodesic Analysis for data on SO(3). - Salem Said; Nicolas Courty; Nicolas Le Bihan; Stephen J. Sangwine (EUSIPCO, 2007)

Hypercomplex analytic signals : Extension of the analytic signal concept to complex signals. - Stephen J. Sangwine; Nicolas Le Bihan (EUSIPCO, 2007)

Jacobi method for quaternion matrix singular value decomposition. - Nicolas Le Bihan; Stephen J. Sangwine (Appl. Math. Comput., 2007)

Quaternion involutions and anti-involutions. - Todd A. Ell; Stephen J. Sangwine (Comput. Math. Appl., 2007)

Hypercomplex Fourier Transforms of Color Images. - Todd A. Ell; Stephen J. Sangwine (IEEE Trans. Image Process., 2007)

The ℍ-analytic signal. - Nicolas Le Bihan; Stephen J. Sangwine (EUSIPCO, 2008)

Projective-space colour filters using quaternion algebra. - Todd A. Ell; Stephen J. Sangwine (EUSIPCO, 2008)

Theory of vector filters based on linear quaternion functions. - Todd A. Ell; Stephen J. Sangwine (EUSIPCO, 2008)

Fast Complexified Quaternion Fourier Transform. - Salem Said; Nicolas Le Bihan; Stephen J. Sangwine (IEEE Trans. Signal Process., 2008)

Complex and hypercomplex discrete Fourier transforms based on matrix exponential form of Euler's formula. - Stephen J. Sangwine; Todd A. Ell (Appl. Math. Comput., 2012)

The Orthogonal 2D Planes Split of Quaternions and Steerable Quaternion Fourier Transformations. - Eckhard Hitzer; Stephen J. Sangwine (CoRR, 2013)

Instantaneous frequency and amplitude of orthocomplex modulated signals based on quaternion Fourier transform. - Nicolas Le Bihan; Stephen J. Sangwine; Todd A. Ell (Signal Process., 2014)

Connecting spatial and frequency domains for the quaternion Fourier transform. - Hendrik De Bie; Nele De Schepper; Todd A. Ell; K. Rubrecht; Stephen J. Sangwine (Appl. Math. Comput., 2015)

Comments on 'A structure-preserving method for the quaternion LU decomposition in quaternionic quantum theory' by Minghui Wang and Wenhao Ma. - Stephen J. Sangwine (Comput. Phys. Commun., 2015)

Quaternion Linear Color Edge-Glowing Filter Using Genetic Algorithm. - Shagufta Yasmin; Stephen J. Sangwine (ACIVS, 2016)

Quaternion linear colour edge-sharpening filter using genetic algorithm. - Shagufta Yasmin; Stephen J. Sangwine (CEEC, 2016)

Multivector and multivector matrix inverses in real Clifford algebras. - Eckhard Hitzer; Stephen J. Sangwine (Appl. Math. Comput., 2017)

The development of the quaternion wavelet transform. - Peter Fletcher 002; Stephen J. Sangwine (Signal Process., 2017)

Multi-directional colour edge detector using LQS convolution. - Shagufta Yasmin; Stephen J. Sangwine (IET Image Process., 2018)