Luminance correction apparatus for image signals

Details Luminance correction apparatus for image signals Luminance correction apparatus for image signals

1992-10-28

1997-09-23

Boudreau, Leo

Television

Camera, system and detail

Combined image signal generator and general image signal...

348222, 348235, 348370, 348363, H04N 968, H04N 5228, H04N 5222, H04N 5238

Patent

active

056710135

ABSTRACT:
An apparatus for correcting a luminance level of a still picture obtains first and second images of the same object to produce two sets of pixels of image information. A boundary luminance level is set between the maximum and minimum luminance levels of the first image. A correspondent luminance level is determined as the luminance level of the pixels of the second image which correspond to those pixels of the first image having a luminance level equal to the boundary luminance level. A substitution correction value is determined for each pixel of the second image which corresponds with a pixel of the first image having a luminance level above or below the boundary luminance level. Each substitution correction value is a function of the boundary luminance level and the correspondent luminance level. Each pixel of the first image which has a luminance level above or below the boundary luminance level is replaced with the corresponding pixel of the second image corrected by the respective substitution correction value, the replaced pixel being within a luminance range extending from the minimum to the maximum luminance level of the first image.

REFERENCES:
patent: 4901152 (1990-02-01), Hieda et al.
patent: 5111300 (1992-05-01), Nam
patent: 5144442 (1992-09-01), Ginosar et al.
patent: 5221963 (1993-06-01), Hashimoto et al.
patent: 5247366 (1993-09-01), Ginosar et al.

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