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EP1017229A2
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A method for preserving spatial detail and color content when adjusting the tone scale of a digital color image
Assignee: Eastman Kodak Co
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Filing: 1999-12-03
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Granted: —
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Expires: 2019-12-03
Abstract
Abstract A method for preserving spatial detail and color content is performed when adjusting the tone scale of a digital color image. This method comprises the steps of receiving a digital color image, providing a tone scale function for adjusting the tone scale of the digital color image; providing a spatial filter for adjusting the tone scale of the digital color image; transforming the digital color image into a luminance signal and chrominance signals; using the tone scale function, the spatial filter, and the luminance signal to produce an enhanced luminance signal; and using the tone scale function, the spatial filter, the luminance signal, and the chrominance signals to produce enhanced chrominance signals.
Inventors
- 👤 Andrew Charles Eastman Kodak Company Gallagher
- 👤 Edward Brooks Eastman Kodak Company Gindele
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:16
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6027; H04N5/00; H04N5/14; H04N5/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A method for preserving spatial detail and color content
when adjusting tone scale of a digital color image, the method comprising: (a) providing a tone scale function for adjusting the tone scale
of the digital color image; (b) providing a spatial filter for adjusting the tone scale of the
digital color image; (c) transforming the digital color image into a luminance signal
and chrominance signals; (d) using the tone scale function, the spatial filter, and the
luminance signal to produce an enhanced luminance signal; and, (e) using the tone scale function, the spatial filter, the
luminance signal, and the chrominance signals to produce enhanced chrominance
signals.
Claim 2
Dependent Claim
24 words
The method as in claim 1 wherein step (d) further includes
creating a control signal from a spatially filtered version of the luminance signal.
Claim 3
Dependent Claim
53 words
The method as in claim 2, wherein step (d) further includes
generating a high pass and a low pass signal; wherein step (d) includes generating
at least two non-linear spatial filtered versions of the digital image channel from
the high pass signal, the low pass signal, the control signal, and the luminance
signal.
Claim 4
Dependent Claim
37 words
The method as in claim 3, wherein step (d) further includes
generating an enhanced luminance signal by the application of the tone scale
function to one of the non-linear spatial filtered signal versions of the luminance
signal.
Claim 5
Dependent Claim
45 words
The method as in claim 4, wherein step (d) further includes
generating an enhanced luminance signal by the application of the tone scale
function to one of the non-linear spatial filtered signal versions of the luminance
signal, and modifying the remaining non-linear spatial filtered signal.
Claim 6
Dependent Claim
24 words
The method as in claim 1 wherein step (e) further includes
calculating a chrominance scaling factor based on the size of the spatial filter.
Claim 7
Dependent Claim
20 words
The method as in claim 6 wherein step (e) further includes
calculating a local slope of the tone scale function.
Claim 8
Dependent Claim
17 words
The method as in claim 7 wherein step (e) further includes
calculating a color position weight factor.
Claim 9
Dependent Claim
24 words
The method as in claim 5 wherein step (e) further includes
calculating a chrominance scaling factor based on the size of the spatial filter.
Claim 10
Dependent Claim
20 words
The method as in claim 9 wherein step (e) further includes.
calculating a local slope of the tone scale function.
References Cited (Backward Citations)
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