By Donald Peattie, Paul Landacre, Robert Finch
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Additional info for A Natural History of Trees: of Eastern and Central North America
Color perception and stereopsis: Gregory ( 1979), Ikeda and Sagawa ( 1979), Nakashima and Ikeda (1978), Ramachandran and Gregory (1978), Ramachandran and Sriram (1972), Russell (1979). Conference reports on stereopsis: Pettigrew ( 1978), Robertson ( 1978). Development of depth perception: Yonas et al. (1978). Disorders of stereopsis: Blake and Cormack (1979), Cowey and Porter ( 1979), Larson ( 1978), Reinecke ( 1979), Ruddock and Waterfield ( 1978). Models of stereopsis and scene analysis: Marr (1977), Marr and Nishihara (1978), Marr and Poggio (1976, 1979), Nelson (1975, 1977), Sutherland (1979), Trehub (1978), von der Heydt et al.
Interestingly, Ay disparities within the fusion limit do not normally contribute to depth perception as Ax disparities do. They are often ignored, especially if confined to local details, although they can give rise to some unusual perceptual phenomena not easily explained by simple geometric analysis of stereopsis (Ogle, 1950). Vertical disparities are of concern in the problems of viewing misaligned stereo pairs, in which vertical as well as horizontal shifts of image details are expected. Vertical disparities can also arise if the two images are taken at slightly different magnifications, or in recording of mock-stereo pairs (see Chapter 8).
33 35 35 37 42 45 46 49 50 Introduction The recording and subsequent viewing of the two micrographs of a stereo pair require the specimen and the electron beam to be oriented relative to each other in such a way that parallax is produced. This can be accomplished either by changing the specimen position while holding the beam fixed, or by tilting the beam while holding the specimen fixed.