Method and apparatus for adaptively interpolating a digital imag

Details Method and apparatus for adaptively interpolating a digital imag Method and apparatus for adaptively interpolating a digital imag

1992-02-26

1994-07-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358428, 358448, H04N 140

Patent

active

053272579

ABSTRACT:
Digital image processing apparatus for interpolating a digital input image into an interpolated output image, in one embodiment of the invention, comprises an input buffer (12) for accommodating pixel data of the input image and a coefficient buffer (14) for storing precalculated interpolation weighting coefficients prior to real time image interpolation. The coefficient buffer (14) comprises a first memory segment (22) for containing a set of precalculated sharp interpolating weighting coefficients obtained by using a sharp interpolating algorithm, a second memory segment (24) for containing a set of precalculated soft weighting coefficients obtained by using a soft interpolating algorithm and a third memory segment (26) for containing a set of precalculated weighting coefficients representative of a predetermined characteristic of the input image, such as contrast or density. The processing apparatus further comprises interpolation logic (16) for calculating a sharp interpolated output image pixel, a soft interpolated output image pixel, and a value for the image characteristic, using the input pixel data and the precalculated weighting coefficients, and an algorithm implementation controller (18) for calculating a resultant output pixel by combining the sharp and soft interpolated pixel values as a function of the image characteristic.

REFERENCES:
patent: 4193092 (1980-03-01), Stoffel
patent: 4712141 (1987-12-01), Tomohisa et al.

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