
383Quantitative Approaches for Studying the Role of Collagen
variable represents distance or frequency is known as a spatial-domain or frequency-domain signal,
respectively. A fundamental area of digital signal processing deals with mathematical techniques for
converting signals from one domain to another. e Fourier transform is a well-known example of these
techniques and is used to convert time-domain signals into frequency-domain signals.
An image, such as might be acquired using the advanced imaging techniques described previously,
can be thought of as a matrix of values, with the rows and columns represented by the independent
variables ...