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Multi-view face detection using discriminant features. Computer Vision and Image Understanding, Vol. 105, Issue 2, February 2007. Peng Wang , Qiang Ji 2006. Outline. Introduction Discriminant feature Experiments. 系統流程圖. STAR. Image. RNDA. Gray-scale. Adaboost. Skin Regions.

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multi view face detection using discriminant features

Multi-view face detection using discriminant features

Computer Vision and Image Understanding, Vol. 105, Issue 2, February 2007

Peng Wang , Qiang Ji

2006

碩言資工一甲 M97G0217 黃烱育

outline
Outline

Introduction

Discriminant feature

Experiments

碩言資工一甲 M97G0217 黃烱育

slide3
系統流程圖

STAR

Image

RNDA

Gray-scale

Adaboost

Skin Regions

Multi-view face

前處理

face detector

碩言資工一甲 M97G0217 黃烱育

introduction
Introduction

Multi-view face processinghas recently received more attentions, since morethan 75% faces in real images are non-frontal.

碩言資工一甲 M97G0217 黃烱育

discriminant analysis
Discriminant analysis

FDA(Fisher discriminant analysis) 1933.

NDA(Nonparametric discriminant

analysis)1990.

RNDA(Recursive Nonparametric Discriminant Analysis)2006

碩言資工一甲 M97G0217 黃烱育

discriminant analysis1
Discriminant Analysis

Fisher 提出線形判別函數,並應用於花卉分類上。他將花卉之各種特徵 利用線性組合方法,將這些基本上是多變量的數據轉換成單變量。再以這個化成單變量的線性組合數值來判別事物間的差別。

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont
Discriminant Analysiscont.

花辦的長與寬

花萼的長與寬

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont1
Discriminant Analysiscont.

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont2
Discriminant Analysiscont.

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont3
Discriminant Analysiscont.

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont4
Discriminant Analysiscont.

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont5
Discriminant Analysiscont.

小結:

描先求得兩群體平均向量差的軸,再根據自變數間共變異的型態調整此軸,以求得能最佳區別兩群體的線性組合函數。

碩言資工一甲 M97G0217 黃烱育

experiments
Experiments

碩言資工一甲 M97G0217 黃烱育

experiments cont
Experiments cont.

碩言資工一甲 M97G0217 黃烱育

slide15

Thank you

碩言資工一甲 M97G0217 黃烱育

harr like features
Harr-like features

若圖像是24*24的話就需要180000以上的features

碩言資工一甲 M97G0217 黃烱育

discriminant analysis cont6
Discriminant Analysis cont.

碩言資工一甲 M97G0217 黃烱育

使得影像中的結構資訊遺失(例如人臉影像會因此被切成許多不連續的片斷)

一維向量的維度為(M×N) × 1 所以在計算within-class matrix 和between-class matrix過程中會產生(M×N) × (M×N)的超高維矩陣

fukunaga nda
Fukunaga-NDA

NNs(Nearest Neighbors)

碩言資工一甲 M97G0217 黃烱育

experiments cont1
Experimentscont.

碩言資工一甲 M97G0217 黃烱育

experiments cont2
Experiments-半側臉 cont.

碩言資工一甲 M97G0217 黃烱育

experiments cont3
Experiments-全側臉 cont.

碩言資工一甲 M97G0217 黃烱育