Image analysis – Image enhancement or restoration – Image filter
Reexamination Certificate
2008-05-20
2008-05-20
Bella, Matthew C. (Department: 2624)
Image analysis
Image enhancement or restoration
Image filter
C358S461000
Reexamination Certificate
active
10717824
ABSTRACT:
A method is disclosed for designing two separable filters, LPP & HPP, that approximates the circularly symmetric frequency response achievable using a non-separable filter. The method selects a cut-off frequency and designs a 1-D low pass filter. Next, the method obtains a low pass 2-D filter and generates a 2-D contour plot therefor. The method designs a 1-D high pass filter and obtains a 2-D high pass filter and a 2-D contour plot therefor. A 2-D filter is generated having the dimensions of the 2-D high pass filter with the only non-zero entry of value 1 located at the center. A matrix is created by subtracting the 2-D high pass filter from the 2-D filter. The low pass 2-D filter is convolved with the matrix to obtain an approximation to a desired circular symmetry.
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Bella Matthew C.
Woldemariam Aklilu K
Xerox Corporation
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