Resampling apparatus suitable for resizing a video image

G - Physics – 06 – T

Patent

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G06T 3/40 (2006.01) H03M 7/00 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2158143

A digital resampler comprises a combination of first means and second means. The first means, which includes interpolation filter means, is responsive to the digital-signal sample values of an input sample stream for producing a first derived sample stream of digital--signal sample values in which the given sampling period P of the input stream is multiplied directly by a factor equal to M'/CL, where C is a given positive integer and M' is smaller than CL, either 2n(M'/CL) or 2- n(M'/CL) is equal to M/L and the absolute value of n is at least equal to zero, so that the sampling period of the first derived sample stream is (M'/CL)P. The second means, which includes octave prefiltering and sample means, is responsive to the first derived sample stream of digital-signal sample values for producing as an output a second derived sample stream of digital-signal sample values in which the first derived sampling period (M'/CL)P of the first derived sample stream is multiplied by a factor equal to either 2n(M'/CL) or 2- n(M'/CL), so that the sampling period of the second derived sample stream is (M/L)P.

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