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- From: rick@cs.arizona.edu (Rick Schlichting)
- Newsgroups: comp.research.japan,comp.ai.neural-nets
- Subject: Kahaner Report: Facial classification by neural nets
- Message-ID: <28954@optima.cs.arizona.edu>
- Date: 29 Dec 92 16:41:54 GMT
- Sender: rick@cs.arizona.edu
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- Approved: rick@cs.arizona.edu
-
-
- [Dr. David Kahaner is a numerical analyst on sabbatical to the
- Office of Naval Research-Asia (ONR Asia) in Tokyo from NIST. The
- following is the professional opinion of David Kahaner and in no
- way has the blessing of the US Government or any agency of it. All
- information is dated and of limited life time. This disclaimer should
- be noted on ANY attribution.]
-
- [Copies of previous reports written by Kahaner can be obtained using
- anonymous FTP from host cs.arizona.edu, directory japan/kahaner.reports.]
-
- To: Distribution
- From:
- David K. Kahaner
- US Office of Naval Research Asia
- (From outside US): 23-17, 7-chome, Roppongi, Minato-ku, Tokyo 106 Japan
- (From within US): Unit 45002, APO AP 96337-0007
- Tel: +81 3 3401-8924, Fax: +81 3 3403-9670
- Email: kahaner@cs.titech.ac.jp
- Re: Facial classification by neural nets
- 25 Dec 1992
- This file is named "face-nn.92"
-
- ABSTRACT. Report on an experiment using a neural network for sex
- descrimination based on facial classification, from Osaka University.
-
- [ Quoted from JETRO, 11/92, p25]
-
- Man-and-Woman Classification from Human Face by Neural Network
-
- Prof. S. Tamura at Osaka University Medical School, and Asst. Prof. H.
- Kawai at Osaka Electro-Communication Junior College have demonstrated
- that the back propagation neural network can identify with high accuracy
- the sex of persons from their faces.
-
- Prof S. Tamura
- Osaka University
- Medical School
- 2-2, Yamadaoka, Suita City, Osaka 565 JAPAN
- Tel: +81-6-875-7111; Fax: +81-6-875-7352
-
- The demonstration test was made with trimmed photos of faces. The
- photos had the skirts cut away to exclude hair style and contour, which
- are likely to be different between men and women. Each photos was
- transformed into three mosaic images: arrays of 8x8, 16x16, and 32x32
- squares, with every square re-painted with gray at the mean brightness
- of the square.
-
- The test started by preparing mosaic facial images from 30 persons, half
- male and half female. The neural network learnt the images and sex of
- the subject. The test encompassed images of all three square arrays,
- but learning at one time used a series of 30 images of one array.
-
- Next, face photos of 30 other persons consisting of 15 men and 15 women
- were transformed into mosaic images of the three square arrays. The
- neural network was given the new images of one array, and checked to see
- correct identification of sexes. When the neural network learned
- 32x32-array mosaic images, it answered 93% correctly even for given
- 8x8-array mosaic images, which were not recognizable as human faces to
- people.
-
- When people identify the sex of a person, they mostly look at the
- behavior, clothes, hair style, and the like. People may identify the
- sex by only looking at a person's face, but here the identification
- heavily depends on the contour of the face. Even clipped photos used to
- make the mosaic transformation in the test often make it difficult for
- people to make the sex identification.
-
- The test indicated that people have an identifying ability poorer than
- the neural network [sic]. How the neural network differentiates between
- the sexes has to be elucidated. The neural network may extract facial
- features that people cannot detect.
-
-
- ----------------------------END OF REPORT---------------------------------
-
-
-