Method for preserving spatial detail when applying a multidimensional tonal transform to a digital color image
AssigneeEastman Kodak Company
InventorsEdward B. Gindele, Andrew Gallagher
Life of this patent
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Abstract
A method for adjusting the color and tonal characteristics of a digital image, the method comprises receiving a digital image having two or more digital image channels; (b) separating each digital image channel into two signals; (c) modifying one of the signals with a multidimensional transform for adjusting the color and tonal characteristics of the digital image; and (d) combining the output of (c) with the remaining signal for producing an enhanced digital image.
Claims43
A method for adjusting the color and tonal characteristics of a digital image, the method comprising the steps of:
- (a) receiving a digital image having two or more digital image channels wherein each digital image channel relates to a different color;
- (b) using a spatial filter for separating each digital image channel into two signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel;
- (c) using the first signal from each pair and a multidimensional transform for adjusting the color and tonal characteristics of the digital image to produce a modified first signal for each digital image channel;
- and
- (d) combining the modified first signal of each digital image channel with the corresponding second signal derived from the same digital image channel for producing an enhanced digital image channel.
A system for adjusting the color and tonal characteristics of a digital image, the system comprising:
- (a) means for receiving a digital image having two or more digital image channels wherein each digital image channel relates to a different color;
- (b) a spatial filter for separating each digital image channel into two signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel;
- (c) means for using the first signal from each pair and a multidimensional transform for adjusting the color and tonal characteristics of the digital image to produce a modified first signal for each digital image channel;
- and
- (d) means for combining the modified first signal of each digital image channel with the corresponding second signal derived from the same digital image channel for producing an enhanced digital image channel.
A computer program product for adjusting the color and tonal characteristics of a digital image comprising:
- a computer readable storage medium having a program stored thereon for performing the steps of:
- (a) receiving a digital image having two or more digital image channels wherein each digital image channel relates to a different color;
- (b) using a spatial filter for separating each digital image channel into two signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel;
- (c) using the first signal from each pair and a multidimensional transform for adjusting the color and tonal characteristics of the digital image to produce a modified first signal for each digital image channel;
- and
- (d) combining the modified first signal of each digital image channel with the corresponding second signal derived from the same digital image channel for producing an enhanced digital image channel.
A method for adjusting the color and tonal characteristics of a digital image, the method comprising the steps of:
- (a) receiving a digital image having two or more digital image channels;
- (b) separating each digital image channel into first and second signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel, wherein the second signal of each pair is generated by subtracting the first signal from the respective digital image channel;
- (c) modifying one of the signals of each pair with a multidimensional transform for adjusting the color and tonal characteristics of the digital image;
- and
- (d) combining an output of step (c) with the remaining signal of each pair for producing an enhanced digital image.
A system for adjusting the color and tonal characteristics of a digital image, the system comprising:
- (a) means for receiving a digital image having two or more digital image channels;
- (b) means for separating each digital image channel into first and second signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel, wherein the second signal is generated by subtracting the first signal from the respective digital image channel;
- (c) means for modifying one of the signals of each pair with a multidimensional transform for adjusting the color and tonal characteristics of the digital image;
- and
- (d) means for combining an output of the modifying means with the remaining signal of each pair for producing an enhanced digital image.
A computer program product for adjusting the color and tonal characteristics of a digital image comprising:
- a computer readable storage medium having a program stored thereon for performing the steps of:
- (a) receiving a digital image having two or more digital image channels;
- (b) separating each digital image channel into first and second signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel, wherein the second signal is generated by subtracting the first signal from the respective digital image channel;
- (c) modifying one of the signals of each pair with a multidimensional transform for adjusting the color and tonal characteristics of the digital image;
- and
- (d) combining an output of step (c) with the remaining signal of each pair for producing an enhanced digital image.
A method for adjusting the color and tonal characteristics of a digital image, the method comprising the steps of:
- (a) receiving a digital image having two or more digital image channels;
- (b) separating each digital image channel into first and second signals, whereby the first signal is a processed signal obtained by using a control signal derived from one or more of the digital image channels and the second signal is generated by subtracting the processed signal from the digital image channel;
- (c) modifying the second signal with a multidimensional transform for adjusting the color and tonal characteristics of the digital image;
- and
- (d) combining an output of step (c) with the remaining signal for producing an enhanced digital image.
Dependencies are inferred from the claim text.