Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-07-10
1991-05-07
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 32, 358 37, 358169, H04N 964
Patent
active
050141201
ABSTRACT:
Disclosed herein is a method for processing a first picture to be reproduced on a color picture tube. The value e.sub.ys of luminance signal for a shadow S of a second picture, which has been obtained from a preceding scanning operation, is subtracted from the value e.sub.y of luminance signal for a desired pixel P out of video signals received, thereby determining the value e.sub.p of a base luminance signal. Luminance signal values e.sub.s and e.sub.h are set respectively for a shadow S and a highlight H among pixels of the first picture to be reproduced on the color picture tube. The value e.sub.q of a luminance signal for a pixel Q, which corresponds to the pixel P and is to be reproduced, is determined from the signal values e.sub.p, e.sub.s and e.sub.h in accordance with a particular correction formula. The luminance of each pixel, which is to be reproduced on the color picture tube, is adjusted in accordance with the value e.sub.q of the corresponding luminance signal thus determined. A picture signal processor suitable for use in the practice of the method is also disclosed.
REFERENCES:
patent: 4353092 (1982-10-01), Bailey et al.
patent: 4450482 (1984-05-01), Ackermann
patent: 4489349 (1984-12-01), Okada
patent: 4654710 (1987-03-01), Richard
patent: 4924323 (1990-05-01), Numakura et al.
Numakura Iwao
Numakura Takashi
Shepperd John W.
Yamatoya & Co., Ltd.
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