Technologies for Smart Sensors and Sensor Fusion

21	Versatile Recognition Using Haar-Like Features for Human Sensing

Jun Nishimura and Tadahiro Kuroda

CONTENTS

21.1    Introduction

21.1.1    Sensor Networks

21.1.2    Potential Application

21.1.3    Conventional Approach in Context Recognition

21.1.3.1    Sound Signals

21.1.3.2    Acceleration Signals

21.1.3.3    Image

21.1.4    Overview of Our Approach: Versatile Recognition

21.2    Designing Haar-Like Features for Sound

21.2.1    Characteristic Feature of Sound Signals

21.2.2    Designing 1-D Haar-Like Features

21.2.2.1    Conventional Haar-Like Features

21.2.2.2    Basic Concept

21.2.2.3    1-D Haar-Like Feature Design

21.2.3    Calculating Haar-Like Feature Value

21.2.4    Calculation Cost Reduction of Haar-Like Feature

21.2.4.1    Filtering ...