US 2008/0260282 A1Published application

Image processor

AssigneeBrother Kogyo Kabushiki Kaisha

InventorTomohiko HASEGAWA

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Abstract

The image processor includes an image filter acquiring unit, a reduced image average value calculating unit, a normalization parameter setting unit, an original image average value calculating unit, an original image reflectance acquiring unit, a normalizing unit, and a correcting unit. The image filter acquiring unit generates either one of the original image filter and the reduced image filter based on the other one of the original image filter and the reduced image filter. The reduced image average value calculating unit calculates an average peripheral value for each pixel in the reduced image using the reduced image filter. The normalization parameter setting unit tabulates frequencies of each reflectance value within the entire range of reflectance values of the reduced image and sets a normalization parameter. The normalizing unit normalizes the reflectance value for each pixel in the original image based on the normalization parameter. The correcting unit corrects a value for each pixel based on the normalized reflectance value for the each pixel in the original image.

Claims47

Dependent claims

An image processor for correcting an image, comprising:

a reduced image forming unit forming a reduced image by reducing an original image;
an image filter acquiring unit acquiring a reduced image filter for the reduced image and an original image filter for the original image, the image filter acquiring unit generating either one of the original image filter and the reduced image filter based on the other one of the original image filter and the reduced image filter;
a reduced image average value calculating unit calculating an average peripheral value for each pixel in the reduced image using the reduced image filter;
a reduced image reflectance acquiring unit finding a reflectance value for each pixel in the reduced image from a value of the each pixel and the average peripheral value of the each pixel;
a normalization parameter setting unit tabulating frequencies of each reflectance value within the entire range of reflectance values found by the reduced image reflectance acquiring unit for all the pixels and setting a normalization parameter;
an original image average value calculating unit calculating an average peripheral value for each pixel in the original image using the original image filter;
an original image reflectance acquiring unit finding a reflectance value for each pixel in the original image from a value of the each pixel and the average peripheral value of the each pixel;
a normalizing unit normalizing the reflectance value for each pixel in the original image based on the normalization parameter;
and
a correcting unit correcting a value for each pixel based on the normalized reflectance value for the each pixel in the original image.

7 more elements

A method for correcting an image, comprising:

forming a reduced image by reducing an original image;
acquiring a reduced image filter for the reduced image and an original image filter for the original image, the acquiring including generating either one of the original image filter and the reduced image filter based on the other one of the original image filter and the reduced image filter;
calculating an average peripheral value for each pixel in the reduced image using the reduced image filter;
finding a reflectance value for each pixel in the reduced image from a value of the each pixel and the average peripheral value of the each pixel;
tabulating frequencies of each reflectance value within the entire range of reflectance values found for all the pixels and setting a normalization parameter;
calculating an average peripheral value for each pixel in the original image using the original image filter;
finding a reflectance value for each pixel in the original image from a value of the each pixel and the average peripheral value of the each pixel;
normalizing the reflectance value for each pixel in the original image based on the normalization parameter;
and
correcting a value for each pixel based on the normalized reflectance value for the each pixel in the original image.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/864,251Filed 28 Sep 2007
Priority: JP 2006-23553531 Aug 2006
Published: 23 Oct 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G06T 5/40
Image enhancement or restoration: using histogram techniques
G06T 5/92
Dynamic range modification of images or parts thereof: based on global image properties
G06T
Image data processing or generation, in general

Family

Application11/848,563Continuation in part · filed 31 Aug 2007
Application11/864,251Continuation in part
US 2008/0056616 A1Published application
US 8,081,831 B2Related patent
US 8,081,839 B2Related patent
US 2008/0260282 A1This patent

From the US filing history. Foreign family members aren’t listed.