System for selective scaling of digital video images

Details System for selective scaling of digital video images System for selective scaling of digital video images

1987-10-19

1989-10-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 77, 358456, 358447, 358451, 382 47, H04N 1393

Patent

active

048720640

ABSTRACT:
Method and apparatus for the selective scaling, such as magnification and reduction, of video images stored as collections of image pels in a video memory. A lookup table is provided for determination of the values of the scaled image pels. A framing matrix of unscaled image pels is established for each scaled image pel. The framing matrix for the scaled image pels determines the outputs read out of the lookup table, and derivatively, determines the values of the scaled image pels. The scaled image pels are stored in the video memory for subsequent display or processing.

REFERENCES:
patent: 4381547 (1983-04-01), Ejiri
patent: 4528693 (1985-07-01), Pearson et al.
patent: 4610026 (1986-09-01), Tabata et al.
patent: 4680720 (1987-07-01), Yoshii et al.
patent: 4725892 (1988-02-01), Suzuki et al.
patent: 4733230 (1988-03-01), Kurihara et al.
patent: 4803558 (1989-02-01), Hiratsuka et al.

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