Biomedical Engineering Reference
In-Depth Information
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FIgurE 16.8
Digital image structure. A digital image is a matrix of values representing the intensity at each matrix
location, or pixel.
and the output is the frequency-domain equivalent). The frequency domain contains exactly the same
information as the spatial (or time) domain but in a different form. In the case of the Fourier transform,
the frequency domain describes the amplitudes of the sine and cosine waves of which the original sig-
nal (image) is composed. These sine and cosine waves are known as the basis functions of the Fourier
transform [47].
FIgurE 16.9
The combination of different sinusoids yields a new pattern. The more unique sinusoids combined,
the more complex the resultant image will be.
