We compared the precision of perceptual localization and manual pointing. A Gaussian blob was presented 6 degrees to the right or left of a central fixation spot on a CRT screen. Above and below the blob, vertical lines were displayed. On each trial, the blob was slightly offset to the right or left with respect to the lines. The subjects had to judge whether the blob appeared to the right or t...

In this paper we present the work developed on offline signature verification using Hidden Markov Models (HMM)[1]. HMM is a well-known technique used by other biometric features, for instance, in speaker recognition and dynamic or on-line signature verification. Our goal here is to extend Left-to-Right (LR)-HMM to the field of static or off-line signature processing using results provided by im...

This paper presents a framework to simultaneously segment and track multiple body parts of interacting humans in the presence of mutual occlusion and shadow. The framework uses multiple free-form blobs and a coarse model of the human body. The color image sequence is processed at three levels: pixel level, blob level, and object level. A Gaussian mixture model is used at the pixel level to trai...

The misperceived direction of type-II plaids has posed a problem for the intersection of constraints (IOC) model of two-dimensional motion perception. Alais et al. (1994, Vision Research, 34, 1823-1834) examined the perceived direction of type-II plaids and concluded that in addition to the direction signalled by the IOC process, a monocular mechanism signalling the motion of plaid features (bl...

In this research, three methods for the detection of crack defects on integrated circuit (IC) packages are proposed. These methods use blob analysis technique in image processing stage, and use multi-layered perceptron (MLP) neural network to classify the IC package. This paper presents the various filters and operations employed in blob analysis. The simulation results have shown, that a two-l...

Measurement of blob-like structure in the boundary region of ECRH plasmas in a simple magnetic configuration in QUEST (major radius, R = 0.68 m, minor radius, a = 0.40 m and toridal magnetic field, Bt = 0.25 T at R = 0.64 m) using combination of a fast imaging camera with a movable and rotatable Langmuir probe system was presented. The blob-like structures, which had an elongated structure alon...

We report on the discovery of a z = 3.16 Lyman-α emitting blob in the GOODS South field. The blob has a total Lyα luminosity of ∼ 10 43 erg s −1 and a diameter larger than 60 kpc. The available multi-wavelength data in the GOODS field consists of 13 bands from X-rays (Chandra) to infrared (Spitzer). Unlike other discovered Lyα blobs, this blob shows no obvious continuum counterpart in any of th...

We summarize our axioms for higher categories, and describe the "blob complex." Fixing an n-category , the blob complex associates a chain complex B(*)(W;C) to any n-manifold W. The zeroth homology of this chain complex recovers the usual topological quantum field theory invariants of W. The higher homology groups should be viewed as generalizations of Hochschild homology (indeed, when W = S(1)...

This paper generalizes Lyaponov functionals to the local setting, and it is shown that they may serve as a connection between Florack's et al. pseudo-linear scale-spaces and Koenderink's et al. local soft histograms. A generalized scale-selection method is proposed based on local Lyaponov functionals and local soft histograms, and it is shown that the method includes Lindebergs's Blob-detector ...

Human observers were trained to criterion in classifying compound Gabor signals with symmetry relationships, and were then tested with each of 18 blob-only versions of the learning set. Generalization to dark-only and light-only blob versions of the learning signals, as well as to dark-and-light blob versions was found to be excellent, thus implying virtually perfect generalization of the abili...