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Analog Models for Early Vision


Harris, John Gregory (1991) Analog Models for Early Vision. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/CTH4-5074.


Analog models provide a novel framework for understanding and developing algorithms for computer vision. This thesis introduces several extensions to well-known resistive network techniques for solving early vision problems. First, constraint boxes are developed as a general methodology for mapping regularization-based algorithms onto stable analog hardware. These multiterminal resistor systems solve low-level vision problems by minimizing a global Lyapunov energy. Second, a circuit element called the resistive fuse is introduced to extend these networks for discontinuity detection. This is the first hardware circuit that explicitly implements line-process discontinuities. Since resistive fuse networks must minimize a non-convex energy function that may contain local minima, complex annealing or continuation methods are necessary for adequate solutions of the problem. Third, the tiny-tanh network is proposed as a new mechanism for discontinuity detection that is not plagued by problems with local minima. A piece-wise constant segmentation is performed through minimization of a convex Lyapunov energy.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Computation and Neural Systems)
Degree Grantor:California Institute of Technology
Major Option:Computation and Neural Systems
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Koch, Christof
Thesis Committee:
  • Koch, Christof (chair)
  • Barr, Alan H.
  • Mead, Carver
  • Van Essen, David C.
  • Goodman, Rodney M.
Defense Date:30 May 1991
Record Number:CaltechETD:etd-06202007-093347
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2659
Deposited By: Imported from ETD-db
Deposited On:13 Jul 2007
Last Modified:03 Nov 2021 23:15

Thesis Files

PDF (Harris_jg_1991.pdf) - Final Version
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