Image analysis – Image transformation or preprocessing – Fourier transform
Reexamination Certificate
2005-06-07
2005-06-07
Couso, Yon J. (Department: 2625)
Image analysis
Image transformation or preprocessing
Fourier transform
C382S300000
Reexamination Certificate
active
06904180
ABSTRACT:
A method for analyzing a digital image channel comprising the steps of providing a digital image channel, extracting a signal from the digital image channel, and using the extracted signal to determine whether the digital image channel is an interpolated digital image channel or a non-interpolated digital image channel. More specifically, the extracted signal comprises a signal related to differences between the values of neighboring pixels of the digital image channel, and the periodicity of the extracted signal is analyzed by computing a Fourier Transform signal of the extracted signal and looking for peaks in the Fourier Transform signal.
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Couso Yon J.
Eastman Kodak Company
Woods David M.
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