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Yuri Knizhnikov
PECULIAR FEATURES AND PROBLEMS OF VISUAL INTERPRETATION
OF DIGITAL SPACE IMAGES
Yuri KNIZHNIKOVY, Nicolai ZINCHUK
Moscow State University, Russia
Faculty of Geography
mail€ lakm.geogr.msu.su
Technical Commission IV-5
KEY WORDS: Integrate Object of Recognition, Analog-to-Digital Conversion, Interpretation, Generalisation, Stereo
Test Objects.
ABSTRACT
The investigation deals with the specific properties of object recognition upon discrete space images which practical
using is intensively developed. This paper studied the following problems: influence of analog-to-digital (A/D)
conversion on representation and interpretation properties of discrete space images; psychophysiological aspects of
objects recognition upon discrete space images; peculiar features of aerospace generalisation of discrete images;
specific properties of stereoscopic visual observation of discrete aerospace images.
The following principal results were obtained. Influence of parameters of scanning (size of aperture and value of
sampling rate) on representation and interpretation properties of discrete space images was established. Notion of
integrate object of recognition which is consisted of finite quantity of image pixels was determined. Statement of
optimal aerospace generalisation and cartographic specifications for produced discrete images were defined. The
relationship between resolution of stereoscopic visual perception and pixel size of discrete space images was estimated.
Generality of information procedures between visual perception and mapping interpretation of discrete space images
was shown.
1 INTRODUCTION
At present, practical using of digital (discrete) space images is intensively developed. The investigation deals with the
specific properties of object recognition upon discrete space images. This paper studied the following problems:
influence of analog-to-digital (A/D) conversion on representation and interpretation properties of discrete space images;
psychophysiological aspects of objects recognition upon discrete space images; peculiar features of aerospace
generalisation of discrete images; specific properties of stereoscopic visual observation of discrete aerospace images.
2 INFLUENCE OF ANALOG-TO-DIGITAL (A/D) CONVERSION ON REPRESENTATION AND
INTERPRETATION PROPERTIES OF DISCRETE SPACE IMAGES
2.1 Theoretical estimation of the discrete space images representation properties
One type of discrete images is received by surveying space scanner, and other type is formed from analog-to-digital
(A/D) conversion. Russia has considerable fund of high quality analogue space images, so A/D conversion is basic way
to receive discrete images for computer-based mapping. This way is realized thanks to office photogrammetric
scanners.
The transformation from continuous (photo) images to discrete ones is connected with the degradation of initial image
quality, which is evaluated in resolving power and photographic contrasts decrease. Consequence of this transformation
is the losing of some part of cartographic information. The formal estimation of cartographic information losing may be
based on proposed method.
: x : d : ;
The resolving power of the transformed discrete 1mage (R^)can be estimated as:
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 501
