LE 
REC ETE 
  
t] 
i 
B 
| 
| 
i 
EE SE D 
EXPERT SYSTEM FOR INVESTIGATION OF PHOTOGRAPHIC IMAGE QUALITY. 
Dr. Miklos G. Gerencser 
College for Land Survey and County Planning 
Szekesfehervar 
H-8000 HUNGARY 
EUROPE 
COMMISSION |. 
ABSTRACT: 
An expert system was developed under Borland's Turbo Prologfor judging photographic image quality in order to 
facilitate the ranking of photographs in production.In the first part ofthe program the knowledge base is collected 
containing the necessary preliminary sensitometric, meteorological, on-board photographic, control sensito- 
metric, image densitometric and optional MTF data for ranking. In the second part the program investigates the 
data of the mission troughout a chain of "if then else" relations, following the human expert's thoughts and 
announces its decision in a Quality Report. 
The software written to IBM PCs or Compatibles needs complete and reliable data collection and it partly studies 
the contradictions between the on board protocol and the physical data as well. 
KEY WORDS: Expert System, Image Quality 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
1. INTRODUCTION AND TASK 2. THE ROLE OF THE INFERENCE ENGINE 
The aim of the stand alone Expert Systems (ESs) is to The developed sofware may be followed on Fig.1. Let us 
replace the human experts in cases they are not consider the role of the inference engine on the top of 
accessible or are expensive and so on. Sometimes the this figure. The software itself consists of series of facts 
ES Report may facilitate the communication between and rules. The inference engine is the internal driving 
human experts in the discussing of a special problem, force of the system which has the ability to look trough 
which needs broader agreement. The ES conveys in- the knowledge base where the data are collected in 
formation to the users as well who are not experts at all, form of facts and it applies the rules written in general 
but they would like to know the value of their films. Finally form for the discrete cases of single films in order to con- 
it reacts back to the producers as well. The experiences struct the Report about the film requested. 
having been collected from the earlier mission may be ; 
used in the next one and the Report stimulates the | INFERENCE ENGINE | 
thinking within the complex aerial photographic process. | | 
Not all of human expert activities may be computerized Qulification Knowledge base dev.| 
nowadays. Technological processes are more suitable | 
for these purposes than pure intellectual activities. Well 
defined technological expert areas with 10-100 rules DATA OF 
may beoptimalfor ES applications. Exposure TEST SENSITO- 
The extension ofthe fifth generation languagues and the | Development | AER ET EV DE 
ES Shells are creating an effective environment for pro- ' ON-BOARD FLIGHT 
gramming because these languagues are rather de- [Image contrast | CONTROL SENSI- 
clarative opposed to procedural ones used for other 
photogrammetric purposes. It means that the human Micro imaae : TOMETRY 
expert may formulate the problem generally in rules [Micro image | IMAGE DENSITO- 
which are applied for the special cases of : METRY 
Missions. (Smith, 1988.) Our aim was within this project to | Ranking | MICRO IMAGE 
write an ES which comprehends the whole air photo- 
graphic process and follows the way of the film from the 
  
test sensitometry of the stored film material troughout L— 
the photography and the development till the user in a END REPORT 
Report which describes the story and qualification of the 
filmasitis shown in Appendix l. 
Fig. 1. The block diagram ofthe AIRPHOT Expert System 
622 
peus CI a aa æ# ma PP 
fli 
-—— pps "pease "ST 09 MM « 
— gd qg— A 
-— — P^ 
fi^ 
P 4 MM (n (m9 fa 
CLS 
SEAT —d 
el = = ry ctv 0