Coding of concentric information
AssigneeSTMicroelectronics S.r.l.
InventorsChristel-Loic Tisse, Damien Barbeyrac
Life of this patent
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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.
Claims10
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.
Dependencies are inferred from the claim text.