Image analysis – Image compression or coding – Shape – icon – or feature-based compression
Reexamination Certificate
2006-04-18
2006-04-18
Do, Anh Hong (Department: 2627)
Image analysis
Image compression or coding
Shape, icon, or feature-based compression
C382S232000, C382S248000
Reexamination Certificate
active
07031539
ABSTRACT:
A method for coding in frequency, module and phase a digital representation, in the space field, of a ring-shaped element, including the steps of: applying to any point of the element a polar conversion at constant angle, whereby the element is unfolded in rectangular form; transferring, to the frequency field, any point of the converted rectangular shape by means of a Fourier transform; filtering the discrete data resulting from the transfer by means of at least one real, bidimensional, band-pass filter, oriented along the phase axis; applying a Hilbert transform to the filtering results; applying an inverse Fourier transform to the results of the Hilbert transform; and extracting phase and module information in the space field.
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Barbeyrac Damien
Tisse Christel-Loic
Do Anh Hong
McClellan William R.
STMicroelectronics S.A.
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