05689575 is referenced by 50 patents and cites 11 patents.

A real time output containing data relating to states of facial parts is generated. A facial area detection unit (11) has monitoring (51-57) and determining (59-61) processing circuits operating in a pipelining manner to determine position of the facial area. The monitoring circuits (51-57) monitor pixel value frequency using 3D histogram and backprojection processing. The generating facial area signal has masks applied by a unit (12) which supplies data to mouth area and eye area detection units (14,15). Each of these operate on similar principles to the facial area detection unit (11).

Title
Method and apparatus for processing images of facial expressions
Application Number
8/346164
Publication Number
5689575
Application Date
November 21, 1994
Publication Date
November 18, 1997
Inventor
Mark Whitehouse
West Sussex
GB
Anthony Smith
Dublin
IE
Hiroshi Sako
County Dublin
IE
Agent
Kenyon & Kenyon
Assignee
Hitachi
JP
IPC
G06K 9/54
G06K 9/46
G06K 9/00
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