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A NEW METHOD TO CREATE A GEOMETRICALLY CORRECTED IMAGE
OF A DIGITAL CAMERA
Ryuji Matsuoka"*, Kiyonari Fukue", Kohei Cho*, Haruhisa Shimoda®, Yoshiaki Matsumae',
Kenji Hongo”, Naoki Shirai”
* Tokai University Research & Information Center
2-28-4 Tomigaya, Shibuya-ku, Tokyo 151-0063, JAPAN
ryuji@yoyogi.ycc.u-tokai.ac.jp, ftu@keyaki.cc.u-tokai.ac.jp, kcho@keyaki.cc.u-tokai.ac.jp,
; smd@keyaki.cc.u-tokai.ac.jp, jjm@keyaki.cc.u-tokai.ac.jp
Kokusai Kogyo Co., Ltd., 2 Rokuban-cho, Chiyoda-ku, Tokyo 102-0085, JAPAN
kenji hongo@kkc.co.jp, naoki_shirai@kkc.co.jp
Commission V, WG V/1
KEY WORDS: Geometric, Correction, Digital, Acquisition, Orientation, Orthorectification, Method
ABSTRACT:
As performance of a digital camera becomes better and its price becomes lower in recent years, digital camera images are becoming
more popular in diverse fields. Geometrically corrected images of digital camera images are requested in most of digital camera
application fields. Precisely corrected images are available by using conventional photogrammetric technique, but it is too expensive
for almost all digital camera applications.
We have developed a new method to create a geometrically corrected image of a digital camera. By our proposed method one can
create a mosaicked image of ortho-images or rectified images of sufficient quality in a short time without ground survey of control
points. The method is based on analytical photogrammetry and image processing technologies, and it is designed for an amateur
without photogrammetric or image processing know-how to operate it easily after short-period training. And necessary hardware of
the method is compact and not expensive, and no special equipment is required. Minimum hardware components are a pair of scales
such as staffs in leveling, a digital camera not for photogrammetry, and a PC for multi-purpose.
Two systems adopting our method have been developed. One is an image-based information management system for restoration of
cultural heritages, and the other is a system to create a rectified image of an inclined plane for geological survey at a construction site.
Both systems are currently practicable.
1. INTRODUCTION
As performance of a digital camera becomes better and its price
becomes lower in recent years, digital camera images are
becoming more popular in diverse fields. For instance, digital
camera images of an inclined plane have been utilized for
geological survey at a site of a massive scale construction such
as dam and highway construction, and those of a mural painting
have been utilized for making preservation or restoration plans
at a cultural heritage site. Geometrically corrected images of
digital camera images are requested in most of digital camera
application fields. Precisely corrected images are available by
using conventional photogrammetric technique, but there are
usually too few expensive photogrammetric instruments and
experienced photogrammetrists in most cases. And furthermore,
conventional photogrammetric work is too expensive for almost
all digital camera applications.
Accordingly, we decided to develop a method to create a
geometrically corrected image of a digital camera. By our
proposed method one can create a mosaicked image of ortho-
images or rectified images of sufficient quality in a short time
without ground survey of control points. The method is based
on analytical photogrammetry and image processing tech-
nologies, and it is designed for an amateur such as a geological
engineer or a restoration researcher without photogrammetric or
image processing know-how to operate it easily after short-
period training.
2. FEATURES OF THE METHOD
We have developed a method to create a geometrically
corrected image of a digital camera based on digital photo-
grammetry, and image processing technologies. Major features
of our method are as follows:
(1) Easy operation
The major advantage of our method is that it is easy for a
nonprofessional to operate it. Short-period training makes a
nonprofessional without photogrammetric or image process-
ing know-how to operate it. Main manual operations of the
method are image acquisition by a digital camera and
simple operations of a personal computer (PC).
(2) Small scale and low cost hardware
The second advantage of our method is that necessary
hardware is compact and not expensive, and no special
equipment is required. Recent advancement of digital
image processing technology makes it possible to obtain
almost equal results by small scale and low cost hardware
designed for nonprofessional purposes to some obtained by
conventional analog/analytical photogrammetric instru-
ments. Minimum hardware components of our method are
a pair of scales such as staffs in leveling, a digital camera
that is not designed for, and a PC for multi-purpose. Since
all hardware components are for all purposes and available
on the market, the cost of the system becomes low.
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