Automatic tone correction of images using non-linear histogram p

Details Automatic tone correction of images using non-linear histogram p Automatic tone correction of images using non-linear histogram p

1993-07-12

1996-08-06

Boudreau, Leo

Image analysis

Histogram processing

With a gray-level transformation

382274, 358448, 358461, 358522, G06K 936

Patent

active

055442587

ABSTRACT:
A method and apparatus for automatically correcting the tone values of a digitally stored image includes compiling a histogram of the relative occurrence of gray values in the stored image in memory. The histogram is processed by adding a constant, taking the square root, and digital filtering. The processed histogram is numerically integrated and then normalized to form a tone correction function. The present tone correction method may be used to tone correct color images by applying separate tone correction functions generated for each of the three color planes independently, or in the alternative, by applying a composite tone correction function corresponding to the average of histograms of the respective individual color planes. A switch is provided to allow the operator to view the results of both methods of automatic tone correction for color images, and choose the best resulting image.

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