Digital image interpolator with multiple interpolation algorithm

Details Digital image interpolator with multiple interpolation algorithm Digital image interpolator with multiple interpolation algorithm

1989-06-16

1991-04-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358451, 358462, H04N 514

Patent

active

050087525

ABSTRACT:
An interpolator for enlarging or reducing a digital image includes an interpolation coefficient memory containing interpolation coefficients representing several different one dimensional interpolation kernels. A row interpolator receives image pixel values, retrieves interpolation coefficients from the memory, and produces interpolated pixel values by interpolating in a row direction. A column interpolator receives multiple rows of interpolated pixel values from the row interpolator, retrieves interpolation coefficients from the memory, and produces rows of interpolated pixel values by interpolating in a column direction. A logic and control unit monitors the content of the input data and switches between interpolation kernels to provide optimum interpolation for each type of content.

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"Cubic Convolution Interpolation for Digital Image Processing" by Robert G. Keys, IEEE Transactions on Acoustics, Speech & Signal Processing, vol. ABSP-29, No. 6, Dec. 1981, pp. 1153-1160.

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