Discrete transform techniques form the mathematical foundation of modern image and video compression by converting spatial or temporal pixel data into spectral coefficients that reveal salient ...

we notice that such a characterization in the frequency domain depends on the continuous variable ?. This implies that the Fourier transform, as it is, is not suitable for the processing of ...

The spectrum as defined by the integral Fourier transform for continuous signals does not exist for discrete signals. However, in Section 2.1 we introduced the notion of quasicontinuous signals which ...