Comparison of perceptually uniform quantisationwith average error minimisationin image transform coding
Jesús Malo, Francesc J. Ferri, J. Albert, Jesús Soret · Electronics Letters · 1999
An alternative transform coder design criterion based on restricting the maximum perceptual error of each coefficient is proposed. This perceptually uniform quantisation of the transform domain ensures that the perceptual error will be below a certain limit regardless of the particular input image. The results show that the proposed criterion improves the subjective quality of the conventional average error criterion even if it is weighted with the same perceptual metric.