WO2007026304A3 - A filter for adaptively extracting a local illumination - Google Patents

A filter for adaptively extracting a local illumination Download PDF

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Publication number
WO2007026304A3
WO2007026304A3 PCT/IB2006/052973 IB2006052973W WO2007026304A3 WO 2007026304 A3 WO2007026304 A3 WO 2007026304A3 IB 2006052973 W IB2006052973 W IB 2006052973W WO 2007026304 A3 WO2007026304 A3 WO 2007026304A3
Authority
WO
WIPO (PCT)
Prior art keywords
filter
footprint
pixels
image
local illumination
Prior art date
Application number
PCT/IB2006/052973
Other languages
French (fr)
Other versions
WO2007026304A2 (en
Inventor
Stefano Marsi
Mario Raffin
Paola Carrai
Original Assignee
Koninkl Philips Electronics Nv
Stefano Marsi
Mario Raffin
Paola Carrai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninkl Philips Electronics Nv, Stefano Marsi, Mario Raffin, Paola Carrai filed Critical Koninkl Philips Electronics Nv
Publication of WO2007026304A2 publication Critical patent/WO2007026304A2/en
Publication of WO2007026304A3 publication Critical patent/WO2007026304A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/40—Image enhancement or restoration by the use of histogram techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration by the use of local operators
    • G06T5/94—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20004—Adaptive image processing
    • G06T2207/20012—Locally adaptive

Abstract

A filter (1) for retracting an local adaptation luminance component (IL) from an image signal (IS) comprising samples of an image composed of pixels (Pi j). The filter (1) comprises a footprint (FP) covering a group of neighboring pixels (Pi j). An edge detector (12) detects edges in an image part of the image within the footprint (FP). An accumulator (16) accumulates sample values of a set of neighboring pixels (Pi j) within the footprint (FP) to obtain a sum (A), the set comprising a central pixel (P22) positioned centrally in the footprint (FP) and pixels (Pi j) not being separated from the central pixel (P22) by an edge in the image. A normalizer (15, 17) normalizes the sum (A) with respect to a number of pixels in the set (B).
PCT/IB2006/052973 2005-09-02 2006-08-28 A filter for adaptively extracting a local illumination WO2007026304A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05108053.9 2005-09-02
EP05108053 2005-09-02

Publications (2)

Publication Number Publication Date
WO2007026304A2 WO2007026304A2 (en) 2007-03-08
WO2007026304A3 true WO2007026304A3 (en) 2007-06-07

Family

ID=37714595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/052973 WO2007026304A2 (en) 2005-09-02 2006-08-28 A filter for adaptively extracting a local illumination

Country Status (1)

Country Link
WO (1) WO2007026304A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8934726B2 (en) 2011-12-19 2015-01-13 Dolby Laboratories Licensing Corporation Video codecs with integrated gamut management

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1093087A2 (en) * 1999-10-08 2001-04-18 Eastman Kodak Company Removing chroma noise from digital images by using variable shape pixel neighborhood regions
US20040165086A1 (en) * 2003-02-21 2004-08-26 Ramot At Tel Aviv University Ltd. Method of and device for modulating a dynamic range of still and video images

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1093087A2 (en) * 1999-10-08 2001-04-18 Eastman Kodak Company Removing chroma noise from digital images by using variable shape pixel neighborhood regions
US20040165086A1 (en) * 2003-02-21 2004-08-26 Ramot At Tel Aviv University Ltd. Method of and device for modulating a dynamic range of still and video images

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MARSI S ET AL: "Image contrast enhancement using a recursive rational filter", IMAGING SYSTEMS AND TECHNIQUES, 2004. (IST). 2004 IEEE INTERNATIONAL WORKSHOP ON STRESA, ITALY MAY 14, 2004, PISCATAWAY, NJ, USA,IEEE, 14 May 2004 (2004-05-14), pages 29 - 34, XP010773409, ISBN: 0-7803-8591-8 *

Also Published As

Publication number Publication date
WO2007026304A2 (en) 2007-03-08

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