Picture signal interpolation circuit with gamma compensation

Details Picture signal interpolation circuit with gamma compensation Picture signal interpolation circuit with gamma compensation

1990-04-04

1991-10-15

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358164, 358313, 358336, 360 111, H04N 712, H04N 969, H04N 5202, H04N 979

Patent

active

050579193

ABSTRACT:
A picture signal source (PSS) comprises an encoding circuit (ENC) for encoding a picture signal having a higher bandwidth to a picture signal having a lower bandwidth. Encoding is effected in dependence upon the extent of motion in the picture which is determined by a motion detection device (MOT). An encoding has been given as an example, using several picture signal channels (PC1, PC2, PC3) each having a different picture signal refreshing period of, for example 80, 20 or 40 ms. The so-called field skipping method is used for which a switching circuit (SC4) switching at the frame frequency is provided. The picture display device (PDD) comprises an essentially complementary, inversely operative decoding circuit (DEC) with a motion-compensated (VR') picture signal interpolation circuit (MEM, INT, G) which comprises a gamma compensation circuit (G) according to the invention. Without this circuit a troublesome area flickering may occur upon display in practice. The gamma compensation circuit (G) counteracts the area flickering which is caused by a combination of the act that the picture signal is gamma-corrected (COR..gamma..), the use of the field skipping method (SC4) and the presence of considerable pixel contrasts.

REFERENCES:
patent: 3886589 (1975-05-01), Nasu
patent: 4298896 (1981-11-01), Heitmann
patent: 4412251 (1983-10-01), Tanaka et al.
patent: 4641202 (1987-02-01), Nakamura et al.
patent: 4783703 (1988-11-01), Murakoshi et al.
patent: 4962419 (1990-10-01), Hibbard et al.

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