Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1992-09-11
1995-04-04
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348624, H04N 521
Patent
active
054041791
ABSTRACT:
A field difference signal of a luminance signal is transformed to a plurality of frequency components by the Hadamard transformation, subsequently, nonlinear operation and inverse-transformation are applied to the frequency components and the inverse-transformed field difference signal is subtracted from the luminance signal, and thereby noise in the luminance signal is reduced, on the other hand in respect to a color difference signal, motion of a video image is detected on the basis of the level of at least one of the frequency components; and when the motion of the video image is large and the level of the frequency component is larger than a predetermined value, the level of the field difference signal to be subtracted from the color difference signal is decreased; on the contrary, when the level of the frequency component is the predetermined value and below, the level of the field difference signal to be subtracted from the color difference signal is increased.
REFERENCES:
patent: 4242705 (1980-12-01), Ebihara
patent: 4553165 (1985-11-01), Bayer
Norio Ebihara et al; "Noise Reducer for Television Signals using Hadamard Transform"; The Journal of the Institute of Television Engineers of Japan, vol. 37, No. 12 (Dec. 1983) pp. 1030(56)-1036(62).
Flynn Nathan J.
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Noise reduction apparatus for video image does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise reduction apparatus for video image, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction apparatus for video image will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2382998