Browsing Computer Science and Artificial Intelligence Lab (CSAIL) by Subject "zero crossings"

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    • The Implicit Constraints of the Primal Sketch 

      Grimson, W.E.L (1981-10-01)
      Computational theories of structure-from-motion and stereo vision only specify the computation of three-dimensional surface information at points in the image at which the irradiance changes. Yet, the visual perception ...

    • On Edge Detection 

      Torre, V.; Poggio, T. (1984-08-01)
      Edge detection is the process that attempts to characterize the intensity changes in the image in terms of the physical processes that have originated them. A critical, intermediate goal of edge detection is the detection ...

    • Zero-Crossings and Spatiotemporal Interpretation in Vision 

      Poggio, Tomaso; Nielsen, Kenneth; Nishihara, Keith (1982-05-01)
      We will briefly outline a computational theory of the first stages of human vision according to which (a) the retinal image is filtered by a set of centre-surround receptive fields (of about 5 different spatial sizes) ...