Fast Transforms in Image Processing: Compression, Restoration, and Resampling
Figure 17
Examples of a “sinc-let” (red plots) and, for comparison, of the discrete sinc-function for the same band limitation (blue plots) in their three different positions within the interval of 103 samples of 512 samples (boxes a–c). Plots of their DFT spectra are shown in boxes (d–f).