Enhancing the tonal characteristics of digital images

Details Enhancing the tonal characteristics of digital images Enhancing the tonal characteristics of digital images

2006-09-26

2006-09-26

Mehta, Bhavesh M. (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

Reexamination Certificate

active

07113649

ABSTRACT:
A method of producing a tone scale function which can operate on a source digital image to improve tonal characteristics, includes generating the tone scale function having a highlight tone scale segment and a shadow tone scale segment defined relative to a reference point on the tone scale function, and that is adapted to operate on the source digital image to improve its tonal characteristics by: using a first function with a monotonically decreasing slope characteristic to produce the highlight tone scale segment that includes points that are equal to or greater than the reference point; and using a second function with a monotonically increasing slope characteristic to produce the shadow tone scale segment that includes points that are equal to or less than the reference point.

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