On the Foundations of Vision Modelling, IV. Weberized Mumford-Shah Model with Bose-Einstein Photon Noise: Light Adapted Segmentation Inspired by Vision Psychology, Retinal Physiology, and Quantum Statistics
نویسنده
چکیده
Human vision works equally well in a large dynamic range of light intensities, from only a few photons to typical midday sunlight. Contributing to such remarkable flexibility is a famous law in perceptual (both visual and aural) psychology and psychophysics known as Weber’s Law. There has been a great deal of efforts in mathematical biology as well to simulate and interpret the law in the cellular and molecular level, and by using linear and nonlinear system modelling tools. In terms of image and vision analysis, it is the first author who has emphasized the significance of Weber’s Law in faithfully modelling both human and computer vision, and attempted to integrate it into low level visual processors such as image denoising (Physica D, 175, pp. 241-251, 2003). The current paper develops a new segmentation model based on the integration of both Weber’s Law and the celebrated Mumford-Shah segmentation model (Comm. Pure Applied Math., 42, pp. 577-685, 1989). Explained in details are issues concerning why the classical Mumford-Shah model lacks light adaptivity, and why its “weberized” version can more faithfully reflect human vision’s superior segmentation capability in a variety of illuminance conditions from dawn to dusk. It is also argued that the popular Gaussian noise model is physically inappropriate for the weberization procedure. As a result, the intrinsic thermal noise of photon ensembles is introduced based on Bose and Einstein’s distributions in quantum statistics, which turns out to be compatible with weberization both analytically and computationally. The current paper then focuses on both the theory and computation of the weberized Mumford-Shah model with Bose-Einstein noise. In particular, Ambrosio-Tortorelli’s -convergence approximation theory is adapted (Boll. Un. Mat. Ital., 6-B, pp. 105-123,1992), and stable numerical algorithms are developed for the associated pair of nonlinear Euler-Lagrange PDEs. Numerical results further confirm and highlight the light adaptivity feature of the new model.
منابع مشابه
Weberized Mumford-Shah Model with Bose-Einstein Photon Noise
Human vision works equally well in a large dynamic range of light intensities, from only a few photons to typical midday sunlight. Contributing to such remarkable flexibility is a famous law in perceptual (both visual and aural) psychology and psychophysics known as Weber’s Law. The current paper develops a new segmentation model based on the integration of both Weber’s Law and the celebrated M...
متن کاملImage Segmentation and Its Applications Based on the Mumford-Shah Model
Image Segmentation and Its Applications Based on the Mumford-Shah Model Xiaojun Du, Ph.D. Concordia University, 2011 Image segmentation is an important topic in computer vision and image processing. As a region-based (global) approach, the Mumford and Shah (MS) model is a powerful and robust segmentation technique as compared to edge-based (local) methods. In this thesis we apply the MS model t...
متن کاملOn the Statistical Interpretation of the Piecewise Smooth Mumford-Shah Functional
In region-based image segmentation, two models dominate the field: the Mumford-Shah functional and statistical approaches based on Bayesian inference. Whereas the latter allow for numerous ways to describe the statistics of intensities in regions, the first includes spatially smooth approximations. In this paper, we show that the piecewise smooth Mumford-Shah functional is a first order approxi...
متن کاملCombinatorial Optimization of the piecewise constant Mumford-Shah functional with application to scalar/vector valued and volumetric image segmentation
متن کامل
Existence and Regularity of Solutions to a Variational Problem of Mumford and Shah: A Constructive Approach
We study a variational problem arising in the approach of Mumford and Shah to the image segmentation problem of computer vision Given f L D for a domain D in R the simpli ed Mumford Shah energy associated to a decompositionD N is
متن کامل