Editing Depth perception (section)

=== Defocus blur ===
{{main|Depth of field}}
Selective image blurring is very commonly used in photography and video to establish the impression of depth. This can act as a monocular cue even when all other cues are removed. It may contribute to depth perception in natural retinal images, because the depth of focus of the [[human eye]] is limited. In addition, there are several depth estimation algorithms based on defocus and blurring.<ref>{{cite journal |author=Mather G |title=Image Blur as a Pictorial Depth Cue |journal=Proceedings: Biological Sciences |volume=263 |date=22 February 1996 |pages=169–172 |issue=1367 |bibcode=1996RSPSB.263..169M |doi=10.1098/rspb.1996.0027|pmid=8728981 |s2cid=30513172 }}</ref> Some jumping spiders are known to use image defocus to judge depth.<ref>{{cite journal |author=Takashi Nagata |title=Depth Perception from image defocus in a jumping spider |journal=Science |volume=335 |date=27 January 2012 |pages=469–471 |issue=6067 |doi=10.1126/science.1211667 |pmid=22282813 |last2=Koyanagi |first2=M |last3=Tsukamoto |first3=H |last4=Saeki |first4=S |last5=Isono |first5=K |last6=Shichida |first6=Y |last7=Tokunaga |first7=F |last8=Kinoshita |first8=M |last9=Arikawa |first9=K|bibcode = 2012Sci...335..469N |display-authors=9 |last10=Terakita |first10=Akihisa |s2cid=8039638 |url=https://ir.soken.ac.jp/?action=repository_uri&item_id=4203 }}</ref>