Automatic black stretch control for a television receiver

Details Automatic black stretch control for a television receiver Automatic black stretch control for a television receiver

1994-02-28

1996-05-07

Groody, James J.

Television

Image signal processing circuitry specific to television

Brightness control

348602, 348678, 395900, H04N 557, H04N 558

Patent

active

055151132

ABSTRACT:
An automatically adjustable black stretch control apparatus for a continually adjusting the black stretch of a luminance signal which comprises a black stretch control means for controlling the amount of stretch of the black part of the luminance signal. A luminance signal is input to a plurality of detecting means, each of which detects the percentage of the luminance signal that is within a specified range during a unit period (i.e. a frame). The output of each detecting means is input to one of a plurality of preprocessing means which generates a control index. The output of each preprocessing means is input to one of a plurality of inferring means for creating a synthesized function indicative of the quality of the signal from each of the detecting means. The black stretch control output determining means receives the output of each of the plurality of inferring means and determines the median value of the inferring means signals to determine the amount the black stretch of the luminance signal must be compensated in order to provide an optimum picture. Finally, the black stretch compensation amount control means controls the compensation amount of the black stretch control means according to the compensation amount calculated by the black stretch control output determining means.

REFERENCES:
patent: 5084754 (1992-01-01), Tomitaka
patent: 5191420 (1993-03-01), Lagoni et al.

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