Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1996-03-15
1997-09-16
Peng, John K.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348571, H04N 5208
Patent
active
056686064
ABSTRACT:
A contour restoration apparatus has a plurality of delay circuits connected in series. Maximum and minimum value detection circuits detect maximum and minimum values among an input video signal and output signals of the delay circuits. A mean value circuit is used to calculate a mean value of the of the maximum and minimum values. The mean value is subtracted from a delayed signal having a delay time of one-half of a delay time obtained from all the delay circuits. An adder is used to add the result of the subtraction to the delayed signal. A non-linear processing circuit processes the output of said adder and the maximum and minimum values. The non-linear circuit outputs the output signal of the adder, if the output signal of said adder is between the maximum value and the minimum value. A contour extraction circuit multiplies a signal located centrally among the input video signal, the output signals and the signals located before and after the input signal with a predetermined coefficient. An adder adds the multiplied signals. Another adder adds the result of multiplied signal and the centrally located signal. A contour amplitude circuit detects a difference between the maximum and minimum values and outputs a coefficient determined according to the difference detected. A mixer mixes the output of the non-linear processing circuit and the output of the another adder.
REFERENCES:
patent: 4780623 (1988-10-01), Yagi
patent: 4823194 (1989-04-01), Mishima et al.
patent: 4853783 (1989-08-01), Ozaki
patent: 4918528 (1990-04-01), Oohashi
patent: 4942463 (1990-07-01), Hopkins
patent: 4994915 (1991-02-01), Takahashi
patent: 5001553 (1991-03-01), Matsuo et al.
patent: 5121209 (1992-06-01), Smith et al.
patent: 5177612 (1993-01-01), Nakamura et al.
patent: 5231479 (1993-07-01), Owashi et al.
patent: 5369446 (1994-11-01), Parker et al.
patent: 5412432 (1995-05-01), Hong
patent: 5515787 (1996-05-01), Park
Hamada Masanori
Okamoto Takuji
Sokawa Kenta
Uyeda Kazuya
Yamauchi Hideaki
Grant Chris
Matsushita Electric - Industrial Co., Ltd.
Peng John K.
LandOfFree
Contour restoration apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contour restoration apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contour restoration apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-221974