EP1021032A2
Expired / Lapsed
EP
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A method for adjusting the tone scale of a digital image
Assignee: Eastman Kodak Co
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Filing: 2000-01-06
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Granted: —
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Expires: 2020-01-06
Abstract
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.
Inventors
- 👤 Andrew Charles Gallagher
- 👤 Edward Brooks Gindele
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:58
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N5/00; H04N5/14; H04N5/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
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.
Claim 2
Dependent Claim
39 words
The method as in claim 1 wherein step (d) further comprises
of the steps of (d1) providing a control signal and (d2) using the control signal and
a spatial filter for assisting in the generation of the compensation signal.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein step (a) includes receiving
a luminance channel as the digital image channel.
Claim 4
Dependent Claim
22 words
The method of claim 1, wherein step (a) includes receiving
either a red, green or blue channel as the digital image channel.
Claim 5
Dependent Claim
48 words
The method as in claim 1 wherein step (c) further comprises
the step of (c1) applying the tone scale function to the digital image channel for
forming a tone scaled signal; and (c2) calculating the difference signal by
subtracting the digital image channel from the tone scaled signal.
Claim 6
Dependent Claim
41 words
The method as in claim 1 wherein step (c) further comprises
the step of (c1) generating a difference function derived from the tone scale
function; and (c2) calculating the difference signal by applying the difference
function to the digital image channel.
Claim 7
Independent Claim
97 words
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.
Claim 8
Dependent Claim
48 words
The system as in claim 7 wherein step (c) further comprises
the step of (c1) applying the tone scale function to the digital image channel for
forming a tone scaled signal; and (c2) calculating the difference signal by
subtracting the digital image channel from the tone scaled signal.
Claim 9
Dependent Claim
41 words
The system as in claim 7 wherein step (c) further comprises
the step of (c1) generating a difference function derived from the tone scale
function; and (c2) calculating the difference signal by applying the difference
function to the digital image channel.
Claim 10
Dependent Claim
103 words
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.
References Cited (Backward Citations)
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