Video noise reduction apparatus and method using three dimension

Details Video noise reduction apparatus and method using three dimension Video noise reduction apparatus and method using three dimension

1993-03-18

1994-07-05

Groody, James J.

Television

Image signal processing circuitry specific to television

Combined noise reduction and transition sharpening

348415, H04N 521, H04N 7133

Patent

active

053272420

ABSTRACT:
A noise component of a video signal is reduced by using a three dimensional discrete cosign transform (3-D DCT) to determine the time frequency spectrum of both the video signal and the noise component, subtracting the time frequency spectrum of the noise component from the time frequency spectrum of the video signal, and converting the time frequency spectrum of the modified video signal back to the spatial time domain by using an inverse 3-D DCT.

REFERENCES:
patent: 4435751 (1984-03-01), Hori
patent: 4442454 (1984-04-01), Powell
patent: 4549212 (1985-10-01), Bayer
patent: 4807033 (1989-02-01), Keesen
patent: 4865031 (1989-02-01), Powell
patent: 5126842 (1992-06-01), Andrews
patent: 5128756 (1992-07-01), Johnston et al.

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