US 7,746,503 B2Granted

Method of and device for image enhancement

AssigneeSamsung Electronics Co., Ltd.

InventorSung-Hyun Lim

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Abstract

A method of enhancing an image comprises determining whether brightness values have changed in an output screen of documents that include a text and an image, with respect to a pixel located in a predetermined edge detection region; calculating binarization data values based on each pixel brightness values of a plurality of windows that are formed by applying different samplings to the detected region, when the brightness values are changed in excess of a predetermined threshold Tha, and determining a connectivity of the calculated binarization data values with respect to each of a plurality of windows; estimating the pixel to be edge pixel when the binarization data values have a connectivity; and determining finally the estimated pixel to be an edge pixel when a number of pixels estimated as an edge is in excess of a predetermined fixed value THd, and if not, determining the estimated edge pixel as not being an edge pixel.

Claims14

Dependent claims

A method of enhancing an image in an image processing device, the method comprising:

determining whether a window brightness of a predetermined edge detection region defined by a window in an output screen of documents that include a text region and an image region exceeds a predetermined threshold THa when the difference between brightness values of pixels located in the window exceed the predetermined threshold Tha;
determining if the brightness values of each pixel included in the window exceed a predetermined threshold THb when the window brightness exceeds the predetermined threshold THa;
calculating binarization data values based on the pixel brightness values of a plurality of windows that are formed by applying different samplings to the predetermined edge detection region;
determining a connectivity of the calculated binarization data values with respect to each of the plurality of windows;
estimating the pixel to be an edge pixel when the binarization data values have a connectivity;
and
determining finally the estimated pixel to be an edge pixel when a number of estimated pixels is in excess of a predetermined preset value THd, and if not, determining the estimated pixel not to be an edge pixel.

4 more elements

An image enhancement apparatus, comprising:

a luminosity variance measurement unit for determining the highest brightness value and the lowest brightness value among a plurality of pixels included in a predetermined window and for determining the predetermined window has a luminosity variance when the difference between the highest and lowest brightness values exceed a predetermined threshold THa;
an edge classification unit for assigning binarization data values to each pixel in the predetermined window having the determined luminosity variance and for determining a connectivity of a plurality of windows corresponding to each predetermined window based on the binarization data values of each pixel within a corresponding predetermined window and for estimating an actual edge of a text region in a predetermined edge detection region of an output screen with respect to a document having a text region and an image region based on the connectivity of the plurality of windows;
an edge detection unit for finally confirming an edge estimated pixel to be an edge pixel if the number of the pixels estimated as an edge is in excess of a predetermined preset threshold THd, and if not, determining the edge estimated pixel to not be an edge pixel;
and
an edge emphasis unit for emphasizing the pixel confirmed as an edge.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/032,199Filed 11 Jan 2005
Priority: KR 10-2004-000304715 Jan 2004
Published: US 2005/0157941 A121 Jul 2005
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04N 1/40062
Picture signal circuits: discrimination between different image types, e.g. two-tone, continuous tone
G06K 15/02
Arrangements for producing a permanent visual presentation of the output data , e.g. computer output printers: using printers
G06T 7/12
Segmentation; Edge detection: edge-based segmentation
G06T 2207/10008
Still image; Photographic image: from scanner, fax or copier

Family

US 2005/0157941 A1Pre-grant publication · published 21 Jul 2005
US 7,746,503 B2This patent

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

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