AUTOMATIC DETECTION AND CORRECTION OF NON-RED EYE FLASH DEFECTS

• US 20080049970A1
• Filed: 08/20/2007
• Published: 02/28/2008
• Est. Priority Date: 02/14/2006
• Status: Active Grant

• Current Assignee: FotoNation Limited (Adeia Inc.)
• Original Assignee: FotoNation Vision Limited (Adeia Inc.)
• Inventors: Steinberg, Eran, Vertan, Constantin, Peterscu, Stefan, Ciuc, Mihai, Capata, Adrian, Nanu, Florin, Bigioi, Petronel, Corcoran, Peter
• Granted Patent: US 8,184,900 B2
• Time in Patent Office: Days
• US Class Current: 382/100
• CPC Class Codes: G06T 2207/20061 Hough transform
• CPC Class Codes: G06T 2207/30216 Redeye defect
• CPC Class Codes: G06T 7/0002 Inspection of images, e.g. flaw detection
• CPC Class Codes: G06T 7/64 of convexity or concavity
• CPC Class Codes: G06T 7/90 Determination of colour characteristics
• CPC Class Codes: G06V 40/193 Preprocessing; Feature extraction

Abstract

A technique for detecting large and small non-red eye flash defects in an image is disclosed. The method comprises selecting pixels of the image which have a luminance above a threshold value and labeling neighboring selected pixels as luminous regions. A number of geometrical filters are applied to the luminous regions to remove false candidate luminous regions.

Claims

1. A method for detecting non-red eye flash defects in an image, said method comprising:

(a) defining one or more luminous regions in said image, each region having at least one pixel having luminance above a luminance threshold value and a redness below a red threshold value;

(b) applying at least one filter to a region corresponding to each luminous region;

(c) calculating the roundness of a region corresponding to each luminous region; and

(d) in accordance with said filtering and said roundness, determining whether said region corresponds to a non-red eye flash defect.