Video signal gradation corrector which prevents excessive extens

Details Video signal gradation corrector which prevents excessive extens Video signal gradation corrector which prevents excessive extens

1992-05-22

1994-03-15

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348674, H04N 514

Patent

active

052949869

ABSTRACT:
A gradation corrector for use in a television receiver which can subject a signal at any luminance level to non-linear correction to provide optimum image quality. Memory stores therein luminance histogram of an input signal. On the basis of the data, a circuit detects a total frequency, a circuit detects luminance distribution, and a circuit detects the expanse of the luminance distribution. A circuit calculates a fixed value to be added. Further, a circuit detects a minimum luminance level, and a circuit detects an average luminance level. A circuit calculates an accumulation starting point and a circuit calculates an accumulation stopping point. An adder adds the calculated fixed value to the data in the memory. A circuit accumulates the results in the range from the accumulation starting point to the accumulation stopping point. The accumulation result is stored in memory. A circuit detects the maximum cumulative value, and a circuit normalizes all the data stored in the memory by use of this maximum value. The normalized data are stored in a memory. Thus, the input signal is subjected to optimum normalization by use of the normalized data.

REFERENCES:
patent: 4695884 (1987-09-01), Anastassiou et al.

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