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

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)

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)

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)

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

Multi-Vector Color-Image Filters. - Todd A. Ell (ICIP (5), 2007)

Hypercomplex Color Affine Filters. - Todd A. Ell (ICIP (5), 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)

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)

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)

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)