US 2007/0110330 A1Published application

Method and system for differentially and regularly modifying a digital image by pixel

AssigneeDO Labs

InventorsBenoit Chauville, Michael Kraak, Frederic Guichard

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Abstract

The invention relates to a method and system for modifying a digital image (100) consisting of pixels. Said digital image is divided into areas (103). At least one area value is assigned to each area Zi (103). At least one parameter value Vpij (203) is assigned to each of said areas (103). A set of couples (Zi, Vpij) forms a parameter image (201). The inventive method consists (a) in determining the determined parameter values Vpir for each area (103), the parameter image (201) being called determined parameter image, (b) in adjusting the determined parameter image by reducing the variations thereof, (c) in modifying pixel values (102) of the determined pixel (101) of said digital image (100) according to the parameter values (203) of said adjusted parameter image, whereby the digital image is differentially modified for each of said pixels and quasi regularly for contiguous areas.

Claims30

Dependent claims

A method for modifying a digital image (100) composed of pixels having pixel values (102);

the said digital image being decomposed into zones (103);
each of the said pixels being associated with at least one adjacent zone (105);
at least one zone value (104) being allocated to each of the said zones Zi (103);
at least one parameter value Vpij (203) being allocated to each of the said zones Zi (103);
a set of pairs (Zi;
Vpij), composed of a zone Zi (103) and of a parameter value Vpij (203) associated with the said zone (103), constituting a parameter image (201);
the method said including:
(a) the stage of determining, for each zone (103), determined parameter values Vpir (305), in particular as a function of the zone values (104) of the said digital image (100);
the said parameter image (201) formed in this way being referred to hereinafter as the determined parameter image (505);
the said zone values (104) varying between at least one of the said zones (103) and a contiguous zone (403), the said variation being referred to hereinafter as the variation (401) of the digital image;
the said determined parameter values (305) varying between the said zone (103) and at least one contiguous zone (403), the said variation being referred to hereinafter as the variation of the determined parameter image (402);
the said method additionally including the following stages:
(b) the stage of regularizing the determined parameter image (505) as a function of the said variation (401) of the digital image, by reducing the said variations of the determined parameter image (505) in order to produce a parameter image, referred to hereinafter as the regularized parameter image (507), having a smaller variation level than that of the said variations (401) of the digital image;
(c) the stage of modifying the pixel values (102) of a determined pixel (101) of the said digital image (100) as a function of the parameter values (203) of the said regularized parameter image (507), relative to the zones adjacent to the said determined pixel;
so that the digital image is modified differentially for each of the said pixels and quasi-regularly for the contiguous zones.

12 more elements

A system for modifying a digital image (100) composed of pixels (101) having pixel values (102);

the said digital image (100) being decomposed into zones Zi (103);
each of the said pixels (101) being associated with at least one adjacent zone;
at least one zone value (104) being allocated to each of the said zones Zi (103);
at least one parameter value Vpij (203) being allocated to each of the said zones Zi (103);
a set of pairs (Zi;
Vpij), composed of a zone Zi (103) and of a parameter value Vpij (203) associated with the said zone Zi (103), constituting a parameter image (201);
the said system including:
(a) a first calculating means (504) making it possible to determine, for each zone (103), determined parameter values Vpir (305), in particular as a function of the zone values (104) of the said digital image (100);
the said parameter image formed in this way being referred to hereinafter as the determined parameter image (505);
the said zone values (104) varying between at least one of the said zones and a contiguous zone, the said variation being referred to hereinafter as the variation (401) of the digital image;
the said determined parameter values (305) varying between the said zone and at least one contiguous zone, the said variation being referred to hereinafter as the variation of the determined parameter image;
the said system additionally including 1:
(b) a second calculation means (506) making it possible to regularize the determined parameter image (505) as a function of the said variation (401) of the digital image, by reducing the said variations of the determined parameter image in order to produce a parameter image referred to hereinafter as the regularized parameter image (507) having a smaller variation level than that of the said variations (401) of the digital image;
(c) a third calculating means (508) making it possible to modify the pixel values (102) of a determined pixel (101) of the said digital image (100) as a function of the parameter values of the said regularized parameter image (507), relative to the zones adjacent to the said determined pixel;
so that the said digital image is modified differentially for each of the said pixels and quasi-regularly for the contiguous zones.

12 more elements

Dependencies are inferred from the claim text.