Image analysis – Color image processing
Reexamination Certificate
1998-07-10
2002-04-30
Tran, Phuoc (Department: 2621)
Image analysis
Color image processing
C382S167000
Reexamination Certificate
active
06381361
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to digital image processing and in particular discloses the production of artistic effects in images utilising restricted gamut spaces.
Further the present invention relates to the field of digital image processing and in particular discloses the production of useful artistic effects.
BACKGROUND OF THE INVENTION
Almost any artistic painting of a scene utilises a restricted gamut in that the artist is limited in the colours produced as a result of the choice of medium in rendering the image. This restriction is itself often exploited by the artist to produce various artistic effects. Classic examples of this process include the following well known artistic works:
Camille Pissaro “L'île Lacroix à Rouen, effect de brouillard” 1888. Museum of Art, Philadelphia
Charles Angrand “Le Seine à L'aube”—1889 collection du Petit Palais, Genéve
Henri van de Velde “Crépuscule”—1892. Rijksmuseum Kröller Müller, Otterlo
Georges Seurat. “La côte du Bas-Butin, Honfleur” 1886—Musée des Beaux—Arts, Tounai
It would be desirable to produce, from an arbitrary input image, an output image having similar effects or characteristics to those in the above list.
SUMMARY OF THE INVENTION
The object of the present invention is to produce a graphical effect of an output image having a limited gamut in accordance with predetermined requirements.
In accordance with a first aspect of the present invention there is provided a method of automatically manipulating an input image to produce an artistic effect, the method comprising:
predetermining a mapping of an input gamut to a desired output gamut so as to produce a desired artistic effect, said desired output gamut being constructed from at least one sample image; and
utilising said mapping to map said input image to an output image having a predetermined output gamut.
Preferably, the method further comprises the step of post processing the output image utilising a brush stroke filter.
Further, preferably the desired output gamut is constructed by mapping a predetermined number of input gamut values obtained from said at least one sample image to output colour gamut values and mapping a remainder of input gamut values to output colour gamut values by interpolation. The interpolation process can include utilising a weighted sum of said mapping of a predetermined number of input gamut values to corresponding output colour gamut values.
Preferably also, the construction of said desired output gamut comprises scanning the sample image to build a histogram of colors. The construction of said desired output gamut may further comprise mapping to compensate for a scanning device color gamut. The construction of said desired output gamut may also further comprise mapping to compensate for a printing device color gamut.
REFERENCES:
patent: 4500919 (1985-02-01), Shreiber
patent: 5182548 (1993-01-01), Haeberli
patent: 5787193 (1998-07-01), Balasubramanian
patent: 5801854 (1998-09-01), Naylor, Jr.
patent: 5881211 (1999-03-01), Matsumura
patent: 5907415 (1999-05-01), Yabe
patent: 5937089 (1999-08-01), Kobayashi
patent: 5949967 (1999-09-01), Spaulding et al.
Foley et al., “Computer graphics: Principles and Practice”, Addison-Wesley Publishing Company, 1996, p. 600, 1996.*
Booklet “First impressions: digital photography”, IS&T 46th Annual Conference, Cambridge, Massachusetts, May 11, 1993.
Lapstun Paul
Silverbrook Kia
Silverbrook Research Pty Ltd.
Tran Phuoc
LandOfFree
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