Apparatus to improve image enlargement or reduction by interpola

Details Apparatus to improve image enlargement or reduction by interpola Apparatus to improve image enlargement or reduction by interpola

1990-11-20

1994-04-05

Harkcom, Gary V.

Boots, shoes, and leggings

395133, 3647241, 36472405, 36472418, G06F 1562

Patent

active

053012666

ABSTRACT:
An image interpolation apparatus receives an image signal in the frequency domain. The image signal is supplied to a filter circuit. The output of the filter circuit is transformed by a two-dimensional fourier transformation circuit into a filtered image signal in the spatial domain. The filtered image signal is linearly interpolated by an interpolation circuit to enlarge or reduce the image representing the image signal. The filter circuit, the fourier transformation circuit and the interpolation circuit are under the control of a processor. The processor sets the filter circuit a filter function representing the inverse of the modulated transfer function of the interpolation circuit to compensate for the degradation caused by the modulated transfer function of the interpolation circuit.

REFERENCES:
patent: 4740896 (1988-04-01), Horiba et al.
patent: 4827433 (1989-05-01), Kamon

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