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Directional selectivity and its use in early visual processing.
Marr D, Ullman S. Marr D, et al. Proc R Soc Lond B Biol Sci. 1981 Mar 6;211(1183):151-80. doi: 10.1098/rspb.1981.0001. Proc R Soc Lond B Biol Sci. 1981. PMID: 6111795
Low-level aspects of segmentation and recognition.
Ullman S. Ullman S. Philos Trans R Soc Lond B Biol Sci. 1992 Sep 29;337(1281):371-8; discussion 379. doi: 10.1098/rstb.1992.0115. Philos Trans R Soc Lond B Biol Sci. 1992. PMID: 1359588
Adaptation and gain normalization.
Ullman S, Schechtman G. Ullman S, et al. Proc R Soc Lond B Biol Sci. 1982 Oct 22;216(1204):299-313. doi: 10.1098/rspb.1982.0076. Proc R Soc Lond B Biol Sci. 1982. PMID: 6129632
The interpretation of structure from motion.
Ullman S. Ullman S. Proc R Soc Lond B Biol Sci. 1979 Jan 15;203(1153):405-26. doi: 10.1098/rspb.1979.0006. Proc R Soc Lond B Biol Sci. 1979. PMID: 34162
Are non-directional simple cells constructed from directional subunits?
Richter J, Ullman S. Richter J, et al. Biol Cybern. 1986;54(4-5):313-7. doi: 10.1007/BF00318427. Biol Cybern. 1986. PMID: 3741901
Bandpass channels, zero-crossings, and early visual information processing.
Marr D, Ullman S, Poggio T. Marr D, et al. J Opt Soc Am. 1979 Jun;69(6):914-6. doi: 10.1364/josa.69.000914. J Opt Soc Am. 1979. PMID: 490228
A model for the temporal organization of X- and Y-type receptive fields in the primate retina.
Richter J, Ullman S. Richter J, et al. Biol Cybern. 1982;43(2):127-45. doi: 10.1007/BF00336975. Biol Cybern. 1982. PMID: 6800412
(II) The Y-type response is generated in the inner plexiform layer by a derivative-like operation on the bipolar cell's input, followed by a rectification in the convergence of these inputs onto the Y-ganglion-cell. ...
(II) The Y-type response is generated in the inner plexiform layer by a derivative-like operation on the bipolar cell's input, follow …
On visual detection of light sources.
Ullman S. Ullman S. Biol Cybern. 1976 Feb 5;21(4):205-12. doi: 10.1007/BF00344165. Biol Cybern. 1976. PMID: 1247627 No abstract available.
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