Video signal noise reduction apparatus with variable S/N improvi

Details Video signal noise reduction apparatus with variable S/N improvi Video signal noise reduction apparatus with variable S/N improvi

1997-08-01

2000-07-25

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348607, H04N 5213

Patent

active

060942339

ABSTRACT:
In a noise reducer whose S/N improving amount is variable, as to such a region where image quality deterioration caused by the noise reducer becomes relatively apparent, and both a luminance level and a chroma level are low, the S/N improving amount thereof is decreased. To the contrary, as to such a picture having a dark high frequency range component and a small movement component, no control is made of the S/N improving amount by the above-described luminance level and chroma level, but the normal S/N improvement is sufficiently carried out.

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patent: 5191419 (1993-03-01), Wischermann
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patent: 5442407 (1995-08-01), Iu
"Digital Signal Processing For Image", pp. 115-118, Fukinuki, Nikkan Kogyo Newspaper Publisher.

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