olemus
ISO 9241:
kujutiste visuaalse teravuse piirkond
alates kaugusest, kus kõik kujutised on teravad
= range of visual focus of images from the distance at which all images are in focus

ISO/IEC 19762:
kahel pool objektitasandit oleva ruumi kauguste vahemik,
milles saab objekti liigutada teravuse märgatava languseta,
muutmata seejuures kujtisetasandi ja objektiivi asukohti
= range between the minimum and maximum distances from the sensor at which the focused image is acceptably shaped

ISO/IEC 29794 (biomeetria):
hõivuri sisendava suhtes määratud kaugusevahemik,
mille ulatuses iirisekujutise teravus ületab ettemääratud kvaliteedi
= a distance range relative to the entrance aperture of a capture device over which the iris image has greater than a specified quality with respect to focus

ülevaateid
https://en.wikipedia.org/wiki/Depth_of_field

https://groups.csail.mit.edu/graphics/classes/CompPhoto06/html/lecturenotes/22_DepthDefocus_6.pdf

http://scitechconnect.elsevier.com/wp-content/uploads/2017/02/Focus-Depth-of-Field-and-Lenses.pdf

https://cgvr.cs.uni-bremen.de/teaching/cg_literatur/Rendering%20Depth%20of%20Field%20Effects%20Survey.pdf