Resampling apparatus suitable for resizing a video image

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Details

36472416, 348399, 348440, 348445, G06F 1531, H04N 514

Patent

active

053553284

ABSTRACT:
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 2.sup.n (M'/CL) or 2.sup.-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 2.sup.n (M'/CL) or 2.sup.-n (M'/CL), so that the sampling period of the second derived sample stream is (M/L)P.

REFERENCES:
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4282546 (1981-08-01), Reitmeier
patent: 4472785 (1984-09-01), Kasuga
patent: 4602285 (1986-07-01), Beaulier
patent: 4682301 (1987-07-01), Horiba et al.
patent: 4779217 (1988-10-01), Takeda et al.
patent: 4821223 (1989-04-01), David

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