System and method for providing black diffusion in video image p

Details System and method for providing black diffusion in video image p System and method for providing black diffusion in video image p

1994-12-16

1996-07-09

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348671, 358455, 358465, H04N 140

Patent

active

055349455

ABSTRACT:
In a system for the reproduction of natural images on a display or printer, unviewable negative brightness caused by noise or grain in individual shadow pixels, into adjacent pixels is diffused into adjacent pixels made excessively bright by the same noise or grain process. The visual effect of this diffusion produces truer, deeper blacks in shadow areas, enhances shadow contrast and detail, and reduces perceived noise in shadow areas.

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patent: 5184213 (1993-02-01), Ishida
patent: 5201013 (1993-04-01), Kumagai

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