Method for adjusting the tone scale of a digital image
AssigneeEastman Kodak Company
InventorsAndrew C. Gallagher, Edward B. Gindele
Life of this patent
Estimating the term…
Abstract
A method for adjusting tone scale of a digital image, the method comprises the step of receiving a digital image channel from the digital image; providing a tone scale function for adjusting the tone scale of the digital image channel; calculating a difference signal derived from the digital image channel and the tone scale function; calculating a compensation signal derived from a filtered version of the difference signal; and combining the digital image channel and the compensation signal to generate a modified digital image channel.
Claims42
A method for adjusting tone scale of a digital image, the method comprising the step of:
- (a) receiving a digital image channel from the digital image;
- (b) providing a tone scale function for adjusting the tone scale of the digital image channel;
- (c) calculating a difference signal derived from the digital image channel and the tone scale function;
- (d) calculating a compensation signal derived from a filtered version of the difference signal;
- and,
- (e) combining the digital image channel and the compensation signal to generate a modified digital image channel.
A system for adjusting tone scale of a digital image, the system comprising:
- (a) means for receiving a digital image channel from the digital image;
- (b) means for providing a tone scale function for adjusting the tone scale of the digital image channel;
- (c) means for calculating a difference signal derived from the digital image channel and the tone scale function;
- (d) means for calculating a compensation signal derived from a filtered version of the difference signal;
- and,
- (e) means for combining the digital image channel and the compensation signal to generate a modified digital image channel.
A computer program product for adjusting tone scale of a digital image, comprising:
- a computer readable storage medium having a computer program stored thereon for performing the steps of:
- (a) receiving a digital image channel from the digital image;
- (b) providing a tone scale function for adjusting the tone scale of the digital image channel;
- (c) calculating a difference signal derived from the digital image channel and the tone scale function;
- (d) calculating a compensation signal derived from a filtered version of the difference signal;
- and,
- (e) combining the digital image channel and the compensation signal to generate a modified digital image channel.
Dependencies are inferred from the claim text.