Apparatus and method for interpolating sampled signals

Details Apparatus and method for interpolating sampled signals Apparatus and method for interpolating sampled signals

1991-09-06

1996-05-07

Mancuso, Joseph

Image analysis

Image transformation or preprocessing

Changing the image coordinates

358428, G06K 936

Patent

active

055154573

ABSTRACT:
Sampled points are connected by lines to form a line pattern which may have a steady portion and a suddenly changing portion. Various line patterns are classified into several classes depending on rates of change of slopes of the line patterns. When a line pattern transits from the steady portion to the suddenly changing portion, or vice versa, before or after a sampled point, the differential coefficient of an interpolation curve at the sampling point is made closer to the slope in the steady portion. Sampled signals having sudden transitions can thereby be interpolated without undue fluctuations before and after the transitions.

REFERENCES:
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patent: 3754236 (1973-08-01), Dotson, Jr.
patent: 3789203 (1974-01-01), Catherall et al.
patent: 3883727 (1975-05-01), Stuart et al.
patent: 4031370 (1977-06-01), Catherall
patent: 4263593 (1981-04-01), Dagostino et al.
patent: 4528639 (1985-07-01), Edwards
patent: 5068816 (1991-11-01), Noetzel
"A New Method of Interpolation and Smooth Curve Fitting Based on Local Procedures," by Hirashi Akima; Journal of the Association for Computer Machinery, vol. 19, No. 4, Oct. 1970, pp. 589-602.
"Spline Function in A Personal Computer," Yoshimura et al., Interface, vol. 5, No. 11, Nov. 1, 1979, pp. 93-95.

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