Analyzing Partial Face Regions for Red-Eye Detection in Acquired Digital Images

• US 20110063465A1
• Filed: 07/13/2010
• Published: 03/17/2011
• Est. Priority Date: 10/28/2004
• Status: Active Grant

• Current Assignee: FotoNation Limited (Adeia Inc.)
• Original Assignee: FotoNation Ireland Limited (Adeia Inc.)
• Inventors: Petrescu, Stefan, Ciuc, Mihai, Zamfir, Adrian, Capata, Adrian, Nanu, Florin, Gangea, Mihnea, Drimbarean, Alexandru, Steinberg, Eran, Bigioi, Petronel, Corcoran, Peter, Pososin, Alexei
• Granted Patent: US 8,036,460 B2
• Time in Patent Office: Days
• US Class Current: 348/222.1
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/30216 Redeye defect
• CPC Class Codes: G06T 5/005 Retouching; Inpainting; Scratch removal detecting, correction, reducing or removing defects, e.g. non-responsive pixels of solid state image sensors H04N25/68, scratch removal for cinematographic films scanned by electronic image sensor H04N5/253
• CPC Class Codes: G06T 5/008 Local, e.g. shadow enhancement
• CPC Class Codes: G06T 5/77 Retouching; Inpainting; Scratch removal
• CPC Class Codes: G06T 5/94 based on local image properties, e.g. for local contrast enhancement
• CPC Class Codes: G06T 7/11 Region-based segmentation
• CPC Class Codes: G06T 7/136 involving thresholding
• CPC Class Codes: G06T 7/90 Determination of colour characteristics
• CPC Class Codes: H04N 1/624 Red-eye correction control of camera based on recognised facial parts H04N23/611
• CPC Class Codes: H04N 23/56 provided with illuminating means
• CPC Class Codes: H04N 23/611 where the recognised objects include parts of the human body

Abstract

A method for red-eye detection in an acquired digital image includes acquiring a first image, and analyzing one or more partial face regions within the first image. One or more characteristics of the first image are determined. One or more corrective processes are identified including red eye correction that can be beneficially applied to the first image according to the one or more characteristics. The one or more corrective processes are applied to the first image.

Claims

1. A method for red-eye detection in an acquired digital image comprising the steps of:

acquiring a first image;

analyzing one or more partial or full face regions, or combinations thereof, within the first image, including determining one or more characteristics of the first image;

using an eye model, identifying regions of an eye identified within at least one of the regions;

identifying one or more corrective processes including iris color correction that can be beneficially applied to said first image according to said one or more characteristics; and

applying said one or more corrective processes to said first image.

2. The method of claim 1, further comprising detecting and correcting a red-eye defect in the eye region.

3. The method of claim 2, wherein said applying comprises applying a chain of two or more filters to said first image including an iris color correction filter and a red eye defect filter.

4. The method of claim 1, wherein said analyzing is performed in part on a full resolution partial face region and in part on a subsample resolution of at least one different partial face region.

5. The method of claim 1, wherein said first image comprises a sub-sampled copy of an acquired image.

6. The method of claim 1, wherein the analyzing comprises recognizing one or more faces or types of faces, or both, within the first image.

7. The method of claim 1, wherein the applying comprises applying an iris color correction filter that comprises:

a pixel locator and segmentor;

a shape analyzer;

a falsing analyzer;

or

a pixel modifier, or combinations thereof.

8. The method of claim 1, wherein the one or more corrective processes comprises a color space transformation.

9. One or more computer-readable media having digital code embedded therein for programming a processor to perform a method for iris color correction in an acquired digital image, wherein the method comprises any of the methods recited at claims 1-8.

10. A portable processor-based device having an image acquisition component including a lens and an image sensor for capturing digital images, the device further including a processor being programmed by digital code embedded in one or more processor-readable media to perform a method for iris-color correction in an acquired digital image according to any of the methods recited at claims 1-8.