DETECTION AND EVALUATION OF SKIN DISORDERS BY ONE OF
PHOTOGRAMMETRIC IMAGE ANALYSIS METHODS
M. Gücin? , P. Patias?, M.O. Altan*
“ EU FP7 OBSERVE Project assistant, ITU, Civil Engineering Faculty, 80626 Maslak Istanbul, Turkey — gucin@itu.edu.tr
® AUTH, School of Rural & Surveying Engineering, Box 473, GR-541 24 Thessaloniki, Greece — patias@auth.gr
“ITU, Civil Engineering Faculty, 80626 Maslak Istanbul, Turkey — oaltan@jitu.edu.tr
TC III and V: Medical Imaging and Human Motion
KEY WORDS: Medicine, Identification, Camera, Image, Experimental
ABSTRACT:
Abnormalities on skin may vary from simple acne to painful wounds which affect a person's life quality. Detection of these kinds of
disorders in early stages, followed by the evaluation of abnormalities is of high importance. At this stage, photogrammetry offers a
non-contact solution to this concern by providing geometric highly accurate data. Photogrammetry, which has been used for firstly
topographic purposes, in virtue of terrestrial photogrammetry became useful technique in non-topographic applications also (Wolf et
al, 2000). Moreover the extension of usage of photogrammetry, in parallel with the development in technology, analogue
photographs are replaced with digital images and besides digital image processing techniques, it provides modification of digital
images by using filters, registration processes etc. Besides, photogrammetry (using same coordinate system by registration of images)
can serve as a tool for the comparison of temporal imaging data. The aim of this study is to examine several digital image processing
techniques, in particular the digital filters, which might be useful to determine skin disorders. In our study we examine affordable to
purchase, user friendly software which needs neither expertise nor pre-training. Since it is a pre-work for subsequent and deeper
studies, Adobe Photoshop 7.0 is used as a present software. In addition to that Adobe Photoshop released a DesAcc plug-ins with
CS3 version and provides full compatibility with DICOM (Digital Imaging and Communications in Medicine) and PACS (Picture
Archiving and Communications System) that enables doctors to store all medical data together with relevant images and share if
necessary.
1. INTRODUCTION
1.1 Motivation
Photogrammetry, which has been used for firstly topographic
purposes, in virtue of terrestrial photogrammetry became useful
technique in non-topographic applications also. Aircraft
manufacture, forestry, telecommunication, archaeology,
architecture, geology, engineering, criminology, medicine and
dentistry can be counted in that concern (Wolf et al.,2000).
When compared with the other fields, medical photogrammetry
is quite new area for photogrammetric applications but despite
the newness, it has many sub-fields X-Ray photogrammetry, 3D
modelling from CT and MR images, determination and
observation of physical disorders like scoliosis, or wound
measurement even image guided surgery.
Medical photogrammetry as well as being new it also requires
different and generally unique system designs for every
different sub-area. This challenging feature generates the
motivation of this study as a start.
1.2 Aim of the Study
The aim of this study is to determine some conditions such as
lighting conditions, most appropriate camera settings like ISO
Speed, Shutter Speed, Aperture Value, White Balance etc. to
acquire images that yield the most natural appearance and then,
evaluating data by using digital image processing techniques to
extract the most suitable information, detection of disorders and
observation of their evaluation with the use of computer aided
programs.
Improvements on technological area pave the way for
photogrammetry to be used in different subjects and
applications. Medical field is one of the freshest but promising
scopes. It should be noted that, some of the methods mentioned
below in the study are newly used for medical purposes and are
still on experimental level and further investigations with
deeper examinations are necessary.
2. PROPOSED METHODOLOGY
The detection of skin disorders and their evaluation is divided
into some basic steps.
2.1 Determining the Conditions for Most real like Images
Experiments using different camera conditions in order to
decide the most appropriate criteria that satisfy the needs of the
work.
2.2 Image enhancement
Image enhancement is the step for neutralizing the illumination
effects by using homomorphic filter, thus obtaining light
independent conditions.
2.3 Registration
It is the process needed to compare (pixel by pixel) the temporal
images.
