Browsing AI Memos (1959 - 2004) by Author "Ullman, S."
Now showing items 1-5 of 5
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Against Direct Perception
Ullman, S. (1980-03-01)Central to contemporary cognitive science is the notion that mental processes involve computations defined over internal representations. This notion stands in sharp contrast with another prevailing view ??e direct ... -
Bandpass Channels, Zero-Crossings, and Early Visual Information Processing
Marr, D.; Poggio, T.; Ullman, S. (1978-09-01)A recent advance by B.F. Logan in the theory of one octave bandpass signals may throw new light on spatial-frequency-tuned channels in early visual information processing. -
Directional Selectivity and Its Use in Early Visual Processing
Marr, D.; Ullman, S. (1979-06-01)The construction of directionally selective units and their use in the processing of visual motion are considered. -
The Interpretation of Structure From Motion
Ullman, S. (1976-10-01)The interpretation of structure from motion is examined from a computational point of view. The question addressed is how the 3-D structure and motion of objects can be inferred from the 2-D transformations of their ... -
A Model for the Spatio-Temporal Organization of X- and Y-Type Ganglion Cells in the Primate Retina
Richter, J.; Ullman, S. (1980-04-01)A model is proposed for the spatial and temporal characteristics of X- and Y-type responses of ganglion cells in the primate retina. The model is related to a theory of directional selectivity proposed by Marr & Ullman ...