FourierPwrImg

DESCRIPTION

Raises the coefficients of a frequency domain image by a Power in the log domain. The operation is equivalent to taking the logarithm of the magnitude of the input image, raising that value to a power, exponentiating the result, and writing the result back into the packed complex form. This operation is useful for image sharpening. The input must be a frequency domain image in the packed format produced by the ForwardFFTImg module (see format description in ForwardFFTImg documentation). The Fourier transformation and the cross correlation are discussed in:

Digital Image Processing, Gonzales, R.C., Wintz, P., Addison Wesley, Second Edition, 1987, pp 61--137.

INPUTS

Port: Img In
Type: Lattice
Constraints: 1..3-D
Source frequency domain image.

WIDGETS

Port: Power
Type: Dial
Constant exponent value.

OUTPUTS

Port: Img Out
Type: Lattice
Constraints: 1..3-D
Powered frequency domain image.

KNOWN PROBLEMS

SEE ALSO

ForwardFFTImg, InverseFFTImg, FourierMultImg.
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© The Numerical Algorithms Group Ltd, Oxford UK. 2000