Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-06-09
1997-06-10
Peng, John K.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348645, 348712, 348713, H04N 552, H04N 968, H04N 977, H04N 964
Patent
active
056381387
ABSTRACT:
A dynamic range and contrast modification method for electronic images, and digital and analogue implementations are disclosed. Dynamic range changes are accomplished by making linear and nonlinear modifications to the low frequency component. Contrast changes are accomplished by making cross dependent, linear, and nonlinear modifications to the high frequency component. Cross dependent modifications are modifications that depend upon the changes to the low frequency component. Modifications are achieved using processor elements that implement mathematical operations. An automatic gain control, AGC, is used to control the low frequency component modification for some embodiments.
REFERENCES:
patent: 4568978 (1986-02-01), Cosh
patent: 4712132 (1987-12-01), Soca
patent: 4812903 (1989-03-01), Wagensonner et al.
patent: 4829381 (1989-05-01), Song et al.
patent: 4831434 (1989-05-01), Fuchsberger
patent: 5446504 (1995-08-01), Wada
Oppenheim et al "Digital Signal Processing", Prentice Hall, 1975, pp. 487-489.
Miller John W.
Peng John K.
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