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The question addressed is how the three dimen\u00adsional structure and motion of objects can be inferred from the two dimensional transformations of their projected images when no three dimensional information is conveyed by the individual projections. The following scheme is proposed: (i) divide the image into groups of four elements each; (ii) test each group for a rigid interpretation; (iii) combine the results obtained in (ii). It is shown that this scheme will correctly decompose scenes containing arbitrary rigid objects in motion, recovering their three dimensional structure and motion. The analysis is based primarily on the \u02bbstructure from motion\u2019 theorem which states that the structure of four non-coplanar points is recoverable from three orthographic projections. The interpretation scheme is extended to cover perspective projections, and its psychological relevance is discussed.<\/jats:p>","DOI":"10.1098\/rspb.1979.0006","type":"journal-article","created":{"date-parts":[[2006,12,15]],"date-time":"2006-12-15T17:13:33Z","timestamp":1166202813000},"page":"405-426","source":"Crossref","is-referenced-by-count":636,"title":["The interpretation of structure from motion"],"prefix":"10.1098","volume":"203","author":[{"given":"S.","family":"Ullman","sequence":"first","affiliation":[{"name":"Artificial Intelligence Laboratory, Massachusetts Institute of Technology, 545 Technology Square (Room 808), Cambridge, Massachusetts 02139 U. S. A."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","reference":[{"issue":"7","key":"p_1","first-page":"1","article-title":"Visual perception and the rotating trapezoid","volume":"65","author":"Ames A.","year":"1951","journal-title":"Psycholog. 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