EE4206/EE5806 Digital Image Processing : the amplitude, magnitude and phase of an image

EE4206/EE5806 Digital Image Processing : the amplitude, magnitude and phase of an image

1. The components of the spectrum of the DFT determine the amplitudes of the sinusoids that combine to form the resulting image.

2. At any given frequency in the DFT of an image, a LARGE amplitude implies a greater prominence of a sinusoid of that frequency in the image.

3. Conversely, a SMALL amplitude implies that less of that sinusoid is present in the image.

4. The phase is a measure of displacement of the various sinusoids with respect to their origin.

5. Thus, while the magnitude of the 2-D DFT is an array whose components determine the intensities in the image, the corresponding phase is an array of angles tat carry much of the information about where discernible objects are located in the image.

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