Browsing AI Memos (1959 - 2004) by Author "Yuille, Alan"

Now showing items 1-11 of 11

    • Analog "Neuronal" Networks in Early Vision 

      Koch, Christof; Marroquin, Jose; Yuille, Alan (1985-06-01)
      Many problems in early vision can be formulated in terms of minimizing an energy or cost function. Examples are shape-from-shading, edge detection, motion analysis, structure from motion and surface interpolation ...

    • Describing Surfaces 

      Brady, Michael; Ponce, Jean; Yuille, Alan; Asada, Haruo (1985-01-01)
      This paper continues our work on visual representation s of three-dimensional surfaces [Brady and Yuille 1984b]. The theoretical component of our work is a study of classes of surface curves as a source of constraint ...

    • Direct Passive Navigation: Analytical Solution for Quadratic Patches 

      Negahdaripour, Shahriar; Yuille, Alan (1986-03-01)
      In this paper, we solve the problem of recovering the motion of an observer relative to a surface which can be locally approximated by a quadratic patch directly from image brightness values. We do not compute the ...

    • Energy Functions for Early Vision and Analog Networks 

      Yuille, Alan (1987-11-01)
      This paper describes attempts to model the modules of early vision in terms of minimizing energy functions, in particular energy functions allowing discontinuities in the solution. It examines the success of using ...

    • An Extremum Principle for Shape from Contour 

      Brady, Michael; Yuille, Alan (1983-06-01)
      An extremum principle is developed that determines three-dimensional surface orientation from a two-dimensional contour. The principle maximizes the ratio of the area to the square of the perimeter, a measure of the ...

    • Massively Parallel Implementations of Theories for Apparent Motion 

      Grzywacz, Norberto; Yuille, Alan (1987-06-01)
      We investigate two ways of solving the correspondence problem for motion using the assumptions of minimal mapping and rigidity. Massively parallel analog networks are designed to implement these theories. Their ...

    • Non-Rigid Motion and Regge Calculus 

      Jasinschi, Rado; Yuille, Alan (1987-11-01)
      We study the problem of recovering the structure from motion of figures which are allowed to perform a controlled non-rigid motion. We use Regge Calculus to approximate a general surface by a net of triangles. The ...

    • Perspective Projection Invariants 

      Verri, Alessandro; Yuille, Alan (1986-02-01)
      An important part of stereo vision consists of finding and matching points in two images which correspond to the same physical element in the scene. We show that zeros of curvature of curves are perspective projection ...

    • A Regularized Solution to Edge Detection 

      Poggio, Tomaso; Voorhees, Harry; Yuille, Alan (1985-04-01)
      We consider edge detection as the problem of measuring and localizing changes of light intensity in the image. As discussed by Torre and Poggio (1984), edge detection, when defined in this way, is an ill-posed problem ...

    • Rigidity and Smoothness of Motion 

      Yuille, Alan; Ullman, Shimon (1987-11-01)
      sMany theories of structure from motion divide the process into twosparts which are solved using different assumptions. Smoothness of thesvelocity field is often assumed to solve the motion correspondencesproblem, and then ...

    • Stereo and Eye Movement 

      Geiger, Davi; Yuille, Alan (1988-01-01)
      We describe a method to solve the stereo correspondence using controlled eye (or camera) movements. These eye movements essentially supply additional image frames which can be used to constrain the stereo matching. ...