Method for detecting image interpolation

Details Method for detecting image interpolation Method for detecting image interpolation

2007-07-31

2007-07-31

Couso, Yon J. (Department: 2624)

Image analysis

Image transformation or preprocessing

Changing the image coordinates

C382S280000

Reexamination Certificate

active

10961892

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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