Acquisition of Multispectral Images Using Digital Cameras
Hao-Hsiung HUANG
Associate Professor, Department of Land Economics
National Chengchi University
Taiwan
Tel: 886229393091~50606 Fax: 886229379261
Email: hhh@nccu.edu.tw
ABSTRACT
Near infrared images are very useful for discriminating vegetation. Most of remote sensors can
collect one or more than one band of near infrared image. A digital camera accompanied with
IR filter can also provide near infrared image. An infrared image acquired in this way is much
more mobile, convenient, and attractive.
Infrared sensitivity of various digital cameras has been tested in this research. Transmittance
and adaptability of various filters have also been examined. Experimental results show that
multispectral images collected by digital cameras are very similar to those images collected by
space borne or airborne sensors. Approaches for acquiring and processing multispectral images
by digital cameras are also described in the paper.
1. INTRODUCTION
Multispectral images are usually obtained using space borne or airborne platforms. Traditional
film based cameras accompanied with filters can also take multispectral images. However,
multispectral images using digital cameras are liked to have more mobility, convenience, and
attraction.
The spectral sensitivities of digital cameras and the spectral transmittances of infrared filters
are principal factors when acquiring multispectral images. This subject, procedures of
acquiring multispectral images by digital cameras, and the statistics of multispectral images are
described respectively in the following subsequent sections.
