Filtering system for processing a reduced-resolution video image

Details Filtering system for processing a reduced-resolution video image Filtering system for processing a reduced-resolution video image

1985-03-25

1987-03-24

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358138, 358166, 358183, H04N 964, H04N 983, H04N 712, H04N 5208

Patent

active

046529080

ABSTRACT:
A pix-in-pix display includes a filtering system for processing the video signals which produce the reduced-size image. The filtering system includes an anti-aliasing filter which reduces the amplitude of the components of the video signals which may cause aliasing distortion when the image is subsampled. However, the filter passes substantial amounts of these components. The filtered video signal is subsampled and applied to a peaking filter which amplifies the band of frequencies containing the aliasing components relative to lower frequency bands to improve the appearance of detailed portions of the reproduced image.

REFERENCES:
patent: 4438452 (1984-03-01), Powers
Discrete-Time Systems, An Introduction with Interdisciplinary Applications, by J. A. Codzow, Chapter 9, pp. 299-302, Prentice Hall, 1973.
Rabiner, L. R., "Terminology in Digital Signal Processing", IEEE Transactions on Audio and Electronics, vol. AU-20, No. 5, Dec. 1972, pp. 325-326.

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