White balance correction for negative-to-positive conversion

Details White balance correction for negative-to-positive conversion White balance correction for negative-to-positive conversion

1984-04-16

1986-08-26

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 973

Patent

active

046085955

ABSTRACT:
A white balance correction circuit for negative-to-positive conversion of television signals includes an imaging device for picking up a negative picture to develop video signals which are respectively indicative of three separated colors. The three separated color signals are processed by three processing circuits which are assigned in one-to-one correspondence thereto. An encoder circuit combines output signals of the respective processing circuits to provide a color composite video signal representative of a positive picture associated with the negative picture. Each of the processing circuits comprises an inversion circuit for inverting one of the three separated video signals associated therewith, and a clamp circuit for maintaining extreme values of the video signal at a first predetermined value, whereby a positive picture having an adjusted luminance is reproduced.

REFERENCES:
patent: 2548829 (1951-04-01), Sziklai et al.
patent: 4263622 (1981-04-01), Hinn

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