Device and method for determining black point

Details Device and method for determining black point Device and method for determining black point

1997-05-14

2000-09-19

Peng, John K.

Television

Monitoring, testing, or measuring

Testing of image reproducer

348189, 348191, 348687, 348689, 345147, H04N 1700, H04N 557, G09G 510

Patent

active

061220027

ABSTRACT:
The standard brightness region is displayed with input values of zero. The comparison brightness region is displayed with an input value which is variable in the range of 0 to 255. The standard brightness and comparison brightness regions are displayed next to each other in the display. The input value is changed from zero. A first black point is determined as an input value which causes the comparison brightness region to first appear distinguishable from the black regions of the standard brightness regions. Then, the input value is changed from 255. A second black point is determined as an input value which causes the comparison brightness region to first appear indistinguishable from the black regions of the standard brightness regions. Then, a black point is calculated as an average of the first and second black points.

REFERENCES:
patent: 4959711 (1990-09-01), Hung et al.
patent: 5298993 (1994-03-01), Edgar et al.
patent: 5381349 (1995-01-01), Winter et al.
patent: 5483259 (1996-01-01), Sachs
patent: 5570108 (1996-10-01), McLaughline et al.
patent: 5754222 (1998-05-01), Daly et al.

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