It is often difficult to come up with a well-principled approach to the selection of low-level features for characterizing images for content-based retrieval. This is particularly true for medical imagery, where gross characterizations on the basis of color and other global properties do not work. An alternative for medical imagery consists of the “scattershot” approach that first extracts a la...

We address here the problem of perceptual colour histograms. The Riemannian structure of perceptual distances is measured through standards sets of ellipses, such as Macadam ellipses. We propose an approach based on local Euclidean approximations that enables to take into account the Riemannian structure of perceptual distances, without introducing computational complexity.

Perceptual representations pick out individuals and attribute properties to them. This paper considers the role of perceptual attribution in determining or guiding reference objects. We consider three extant models relation between reference–all guides reference, no a privileged subset attributions reference–and argue that empirical evidence undermines all three. then defend flexible-attributiv...

Perceptual constancy has played a significant role in philosophy of perception. It figures debates about direct realism, color ontology, and the minimal conditions for perceptual representation. Despite this, there is no general consensus what is. I argue that an adequate account must distinguish it from three distinct phenomena: mere sensory stability through proximal change, categorization di...

A b s t r a c t In this paper, we briefly discuss the dynamic and functional approach to computer symbolic tensor analysis. The ccgrg package for Wolfram Language/Mathematica is used to illustrate this approach. Some examples of applications are attached.

In this article, we propose a fuzzy class relation assigning to each pair of finite fuzzy sets a degree to which they are equipollent, which indicates that they have the same number of elements. The concepts of fuzzy sets and fuzzy classes in the class of all countable sets are introduced, and several standard relations and constructions, such as the fuzzy power set and exponentiation, are defi...

In this paper, we present PerTOHS theory for on-line handwriting segmentation, based on the fact that in order to identify patterns, our human perceptual system is based on basic features called perceptual codes. Analysing handwriting, we notice the existence of elementary and global ones. Perceptual organization of elementary perceptual codes in various constraints generates global ones, and t...

Perceptual organization is proposed as a promising intermediate process toward object recognition and reconstruction from 3D surface points, which can be derived from aerial stereo-images, LIDAR data or InSAR data. Here, perceptual organization is to group sensory primitives originating from the same object and has been emphasized as a robust intermediate-level grouping process toward object re...