Fast Hartley transforms for image processing
Chul Hwa Paik, M.D. Fox · IEEE Transactions on Medical Imaging · 1988
The fast Hartley transform (FHT) is used to transform two-dimensional image data. Because the Hartley transform is real-valued, it does not require complex operations. Both spectra and autocorrelations of two-dimensional ultrasound images of normal and abnormal livers were computed.