Face direction estimation using a single gray-level image

Details Face direction estimation using a single gray-level image Face direction estimation using a single gray-level image

2007-09-04

2007-09-04

Couso, Yon J. (Department: 2624)

Image analysis

Applications

Personnel identification

C382S278000, C382S295000

Reexamination Certificate

active

10664122

ABSTRACT:
A method, apparatus, and computer program product for estimating face direction using a single gray-level image (110, 150) of a face are described. Given the single image (110, 150), a face direction can be determined by computing a nose axis (140, 180) maximising a correlation measure between left and right sides (120, 130; 160, 170) of the face. The correlation measure is computed by comparing one of the two sides (A) with another synthetic side (C) derived from the other side (B) using symmetry and perspective transforms. Optionally, this process can be accelerated using a contrast enhancement algorithm taking advantage of the circumstances that the nose is the part of a face reflecting the most light and that this reflected light is represented as a line-like region close to the real nose axis. The computation result is a word describing the spatial position of the face and combining height (“up”, “normal”, “down”) and neck-rotation (“left”, “frontal”, “right”).

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Austrian Search Report dated Jul. 12, 2002 for Singapore Patent Application No. 9905429-8 (4 p.).

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