Image analysis – Color image processing – Color correction
Patent
1995-12-19
1998-08-11
Rogers, Scott
Image analysis
Color image processing
Color correction
358509, 358518, 348222, 348227, 364526, H04N 160, H04N 5243, H04N 964
Patent
active
057938849
ABSTRACT:
A color image editing system and method uses sensor responses in an image capture device to estimate and separate illuminant and surface reflectance in a scene. The system uses the estimated surface reflectances, along with a desired illuminant SPD, to calculate the corresponding XYZ values. To render the images on an imaging device, the XYZ values are converted into device-dependent display or printer values. The image data may be manipulated in a manner that is intuitive to humans, such as correcting the image data according to changes in lighting and surface color.
An image capture device, such as a scanner or digital camera, represents a scene as image data that is resolved as device-dependent channels, such as RGB. For each channel, the spectral reflectances of the surfaces within the scene are described reflectance functions that are independnt of the lighting function that describes the illuminant spectral power distribution (SPD). Display operators can independently adjust the surface and lighting functions.
REFERENCES:
patent: 5157506 (1992-10-01), Hannah
patent: 5481380 (1996-01-01), Bestmann
"Color Constancy: A Method For Recovering Surface Spectral Reflectance", Laurence T. Maloney and Brian A. Wandell; Journal of the Optical Society of America A. vol. 3, pp. 29-33; Jan. 1986.
"Bayesian Method for RecoveringSurface and Huminant Properties from Photosensor Responses", David H. Brainard & William T. Freeman; SPIE-The International Society for Optical Engineering; Feb. 8-10, 1994, vol. 2179; pp. 364-376.
"A Spatial Processor Model For Object Colour Perception", G. Buchsbaum, Dept. of Bioengineering, School of Engineering & Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, vol. 310, No. 1, Jul. 1980, pp. 1-26.
"Color Correction Using Principal Components", M.J. Vrhel & H.J. Trussell; CCC, vol. 17, No. 5, Oct. 1992, pp. 328-338.
Hewlett--Packard Company
Kee Pamela Lau
Rogers Scott
LandOfFree
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