Patent ID: 6057892
Filing Date: 2000-05-02
Classification: G06T,H04N

Abstract:
A method of processing a plurality of consecutive pictures from a video signal for a motion estimation technique comprising, for each picture, calculating complex spatio-temporal spectra of different spatial regions of a picture using a 3-D discrete Fourier transform (DFT) including a temporal window function, performing a modulus squared operation to find the spatio-temporal power spectra, averaging the spatio-temporal power spectra spatially across different picture regions, normalizing the average spatio-temporal power spectrum using the spatial power spectrum derived from the averaged spatio-temporal power spectra as the normalization factor, re-transforming the normalized spatio-temporal power spectrum into the spatio-temporal domain using an inverse DFT, and temporally sub-sampling to produce a motion correlation output, wherein a motion correlation function is generated corresponding to a predetermined time instant by applying said temporal window function in the calculation of the spatio-temporal power spectrum.