
164 Applying Analytics: A Practical Introduction
FIGURE 7.5
The greyscale image data set, created by summing two wave patterns and a
uniform noise background.
form Discrete Fourier Transform (NDFT). Since that book can be ha rd to find,
an alternative starting point is the brief pedagogical introduction in Hwang
et al. (2 005) and the references therein.
7.4.5 Wavelet Analysis in Two Dimensions (Advanced
Topic)
In Section 5.10, I discussed the application of wavelet ana lysis to a 1-
dimensional evenly spa c e d data set. The output of this technique was a het-
erogenous 2-dimensional data set – a str uctur e in which the dimensions were
location and p