{"type":"ScholarlyArticle","title":"A New Sense for Depth of Field","authors":[{"name":"Alex Pentland","slug":"alex-pentland","given":"Alex","family":"Pentland","affiliation":""}],"abstract":"One of t he major un so lv ed pro bl ems in designing an autonomous agent jr obotj th at mu st function in a co mplex, moving environment is obtain in g re li able, real-time depth information, preferahly without the li mi tations of ac ti ve sc anners. Stereo remains computat ionally intensive a nd prone to seve re errors, the use of motion information is still quite experim en ta l, a nd autofocus schemes can measure depth at o nl y one p oi nt at a t im e. We examine a novel source or depth information: focal gradie nts res ul t ing fr om t he limited depth or fleld inherent in most optical system s. We prove t hat this source of information can be use d to make re li a bl e depth maps of useful accuracy with relatively minima l computatio n. Ex periments with realistic imagery show that measu rement or these optica l gra di ents c an potentially provide depth inform at ion rough ly co mparable to stereo disparity or motion parallax, whil e avoidin g im age-to-image mat ehing problems. A potentially real-time ve rsion of t hi s algorithm is described.","doi":null,"url":"https://ijcai.org/proceedings/1985/199","pdf":"https://ijcai.org/proceedings/1985/0199.pdf","markdown":"https://ijcai.org/proceedings/1985/199.md","bibtex":"https://ijcai.org/proceedings/1985/bibtex/199","volume":{"slug":"1985","title":"Proceedings of the Ninth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1985","url":"https://ijcai.org/proceedings/1985/","year":1985,"location":"Los Angeles, California, USA","dates":"","editors":"Aravind Joshi","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Perception","track":"Perception","number":199,"pages":{"first":988,"last":993},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}