Circuit arrangement for recognizing a human face

Details Circuit arrangement for recognizing a human face Circuit arrangement for recognizing a human face

1994-02-25

1996-10-29

Boudreau, Leo

Image analysis

Image transformation or preprocessing

Convolution

382288, 348396, G06K 964

Patent

active

055704344

ABSTRACT:
A circuit for recognizing a human face in a sequence of video is provided. The circuit includes a block structuring circuit in which the video is structured block-wise and wherein two consecutive frames are subtracted from one another. The circuit also includes a unit for block-wise post-processing the difference frames. The post-processing unit includes a comparator for determining the areas of the difference picture which may correspond to a moving object, a mapping unit for forming a status picture by mapping each block of the difference picture which corresponds to a moving object onto a binary "one", all other blocks being mapped to a binary "zero".
The status picture is transformed by a transforming unit into a unidimensional feature function. The unidimensional feature function is then fed to a convolution unit to determine whether the feature function could include a "head-shoulder" scene. If so a plurality of marking units, mark all points of the status picture located within a predetermined rectangle in which the "face" may be present. Each picture element within the predetermined area is then refined.

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patent: 4996594 (1991-02-01), Murayama
patent: 5016282 (1991-05-01), Tomono et al.
patent: 5086480 (1992-02-01), Sexton
patent: 5136659 (1992-08-01), Kaneko et al.
E. Badique, "Knowledge-Based Facial Area Recognition and Improved Coding in a CCITT-Compatible Low-Bitrate Video-Codec", Picture Coding Symposium, Mar. 26-28, 1990, Cambridge, MA.

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