Method for correcting luminance gradation in an image pickup app

Details Method for correcting luminance gradation in an image pickup app Method for correcting luminance gradation in an image pickup app

1998-03-17

2000-08-29

Tran, Phuoc

Image analysis

Color image processing

Color correction

382168, 382169, 358221, 358222, G06K 900

Patent

active

061119806

ABSTRACT:
A synthesized picture signal of a dynamic image is produced by combining a long-time picture signal representing a low luminance and a short-time picture signal representing a high luminance, pieces of histogram data corresponding to a plurality of luminance levels are detected from the synthesized picture signal, a sum of values of pieces of histogram data is repeatedly calculated as a summed value of a piece of summed histogram data while the number of pieces of histogram data is increased, and an inclination of a line indicated by a series of summed values is detected as a luminance gradation characteristic. Thereafter, the luminance gradation characteristic is corrected to a corrected luminance gradation characteristic according to a relationship between a maximum luminance level and an upper limit luminance level of a dynamic range, and a luminance gradation corrected signal composed of the pieces of histogram data corresponding to gradation corrected luminance levels is produced according to the corrected luminance gradation characteristic to make a maximum gradation corrected luminance level equal to or lower than the upper limit luminance level. Therefore, a low luminance object and/or a high luminance object can be clearly reproduced within the dynamic range.

REFERENCES:
patent: 4734776 (1988-03-01), Wang et al.
patent: 5517333 (1996-05-01), Tamura et al.
patent: 5668890 (1997-09-01), Winkelman

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