Apparatus for improving the visibility of images

Details Apparatus for improving the visibility of images Apparatus for improving the visibility of images

1997-02-13

2000-07-18

Harvey, David E.

Television

Image falsification to improve viewer perception of...

Selective contrast expander

348671, H04N 514

Patent

active

060914424

ABSTRACT:
An apparatus for improving the visibility of an image to be displayed is provided in an image signal processor such as a TV or VCR. The image visibility improvement apparatus compares levels of an input image signal with predetermined individual high-level or low-level reference values and outputs the compared result signals. The visibility improvement apparatus increases the level of the image signal if the level of the input image signal is higher than the high-level reference value and decreases the level of the image signal if the input signal is lower than the low-level reference value, according to the results of the comparison. The apparatus thereby further distinguishes the level of the signal of a brighter region from that of a darker region. Thus, the image displayed on a screen can be viewed more easily.

REFERENCES:
patent: 4187519 (1980-02-01), Vitols et al.
patent: 4276568 (1981-06-01), Wischer
patent: 5089890 (1992-02-01), Takayama
patent: 5196937 (1993-03-01), Kageyama
patent: 5257108 (1993-10-01), Muraoka
patent: 5461430 (1995-10-01), Hagerman
patent: 5907665 (1999-05-01), Sobol et al.

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