SS YAN M ie hn TP Y A E buo, LR Wu DAE RO M e uf LA ade Den MG YA ON uta md e nr dt zoe a PA yd diera VER MERC:
rtr DAS IFR SE NILUM D ITE IBS ER MA QUE de LUE ROSES ARR Ss BST MOSS SITE
The object contrast is defined by:
Imax - lmin
C =
Imax * lmin
The pictures were recorded at a height of 1050 m and enlarged
15 times. It was found from different comparisons that the MTF
halfway between zero and the limiting spatial frequency is
significant for judging the visual impression of the image.
This could mean that the MTF for appropriately selected spatial
frequencies could also be chosen to derive image quality criteria
similar to those described. The requirement of regularity over
the field remains.
Conclusions
An image quality criterion based on MTF is highly desirable. The
quality specification should be appropriate for the application
of the optical system and simple for the user. The proposed quality
criteria look promising and comparisons with subjective image qua- |
lity techniques commonly used are favourable. Further evaluations
are needed before quality specification can be recommended.