Separation of diffuse and specular components of surface reflection by use of polarization and statistical analysis of images

The image of an opaque object is created by observing the reflection of the light incident on its surface. The dichromatic reflection model describes the surface reflection as the sum of two components, diffuse and specular terms. The specular reflection component is usually strong in its intensity and polarized significantly compared to the diffuse components. On the other hand, the intensity of the diffuse component is weak and it tends to be unpolarized except near occluding contours. Thus, the observation of an object through a rotating polarizer approximately yields images containing constant diffuse component and specular component of different intensity. In this paper, we show that diffuse and specular components of surface reflection can be separated as two independent components when we apply independent component analysis to the images observed through a polarizer of different orientations. We give a separation simulation of artificial data and also give some separation results of real scenes.     

Comments on “A Petri net model for temporal knowledgerepresentation and reasoning”

Yao (1994) has presented a unified time Petri net model (TPN) for temporal knowledge representation and reasoning, where the TPN model presented has a good contribution to the aspect of temporal knowledge representation and reasoning. However, there are a number of errors which should be corrected. The purpose of the paper is to identify these errors, and the corrections provided permit the readers who have been confused by the errors to gain a better understanding of the good ideas presented.     

A toy model for life at the “edge of chaos”

In this short paper, we illustrate the emergence of complex structures from a simple model of life at the “edge of chaos”. The visualization of the generated patterns provides a good way for understanding the self-organized critical dynamics of the model.     

Comments on “A new model for control of systems withfriction”

This paper provides a complete stability proof of Theorem 1 of the above-mentioned paper (Canudas-de-Wit et al., 1995) for the tracking and the regulation case. In the paper, the proof presented for Theorem 1 only holds for the regulation case where the LaSalle's invariant principle may be invoked. In the tracking case, the closed-loop system becomes a nonautonomous one, and arguments other than the LaSalle's invariant principle should be used. Here we present these arguments and show that Theorem 1 holds for both cases     

Corrigendum to three papers that deal with “Anti”-Bayesian Pattern Recognition [Pattern Recognition]

In the papers [1] (Thomas and Oommen, 2013), [2] (Oommen and Thomas, 2014) and [3] (Thomas and Oommen, 2013), and their associated conference versions cited in those papers, we had introduced a new method of so-called “Anti”-Bayesian Pattern Recognition (PR) which achieved the classification using only a few (sometimes as few as two) points distant from the mean. While the PR strategy, in and of itself, is accurate, the claim that it was based on the Order Statistics (OS) of the distributions of the features is not. The PR and classification results are rather founded on the symmetric quantiles and not on the symmetric OSs. This brief paper corrects the flawed claim presented in those papers.     

Addendum to “Proof rules for flush channels”

The logic presented in a previous paper, see ibid., vol. 19, no.4, p.366-78 (1993) for processes that communicate using flush channels is inadequate for reasoning about processes that send multiple identical messages along a channel. A modification to the logic and proof system that remedies this deficiency is described herein     

基于多层次GERT 的复杂产品研制进度规划“超冲突均衡”博弈模型

针对复杂产品研制进度规划中各级供应商与主制造商之间复杂的工作联系和博弈关系,基于复杂产品多层次研制网络,构建复杂产品研制多层次GERT网络模型,求解产品研制总进度与各级供应商进度的函数关系.进而分析博弈主体之间帕累托均衡、纳什均衡等多种均衡关系,建立进度规划的超冲突均衡博弈模型.通过算倒表明了所提出方法的有效性和实用性.     

Corrigendum to: “On ordering free groups” [J. Symbolic Comput. 40 (2005) 1285–1290]

The proof of the main result of the paper is corrected.