Catalogue of Artificial Intelligence Techniques
Author(s): T.P. Pridmore, S.R. Pollard, S.T. Stenton
A term used by Marr for a representation making explicit the properties of intensity changes in the retinal image(s). The raw primal sketch makes explicit only very localised properties, such as size, position and orientation; the full primal sketch, resulting from grouping elements of the raw primal sketch, makes explicit more global properties such as alignment. Marr claimed that higher level processes interact only with the primal sketch and its derivatives, not with the data from which the primal sketch is derived. The primal sketch is computed by dedicated processors which are independent of higher level processes.
- Marr, D., Vision: a computational investigation into the
human representation and processing of visual information
, W.H. Freeman, San Francisco, 1982.