Radial frequency (RF) patterns, which are sinusoidal modulations of a radius in polar coordinates, are commonly used to study shape perception. Previous studies have argued that the detection of RF patterns is either achieved globally by a specialized global shape mechanism, or locally using as cue the maximum tangent orientation difference between the RF pattern and the circle. Here we challen...

We show that there exist series-parallel graphs requiring Ω(n2 √ ) area in any straight-line or poly-line grid drawing. Such a result is achieved in two steps. First, we show that, in any straight-line or poly-line drawing of K2,n, one side of the bounding box has length Ω(n), thus answering two questions posed by Biedl et al. Second, we show a family of series-parallel graphs requiring Ω(2 √ )...

We have constructed a computer algorithm that finds the contours of the dorsal and ventral portions of the images of ribs in chest radiographs. The following are a few of the expected uses for the automatic detection of rib contours: 1. Rib images contribute false positives in tumor-detection algorithms. Hence> detecting the rib contours should f a c i l i t a t e removal of these lalse posltiv...

A linear band, which is a straight line segment with some width (i.e., thickness), is a more structured, higher-level feature compared to edge or line features. In spite of the usefulness of linear bands as features, papers dealing with their detection problem are rare. In this paper, we propose a new method for detecting linear bands in gray-scale images. We "rst talk about our opinion on what...

Real-time 10,000 km transmission over a straight-line link is achieved using software-defined multi-modulation format receiver implemented on commercial off-the-shelf general-purpose graphics processing unit (GPU). Minimum phase 1 GBaud (QAM) signals are transmitted and successfully received after detection with Kramers-Kronig (KK) coherent receiver. 8-, 16-, 32-, 64-QAM 7600, 5600, 3600, 1600 ...

We introduce the notion of generalized Delaunay triangulation of a planar straight-line graph G = (V, E) in the Euclidean plane and present some characterizations of the triangulation. It is shown that the generalized Delaunay triangulation has the property that the minimum angle of the triangles in the triangulation is maximum among all possible triangulations of the graph. A general algorithm...

We show that there exist series-parallel graphs requiring Ω(n2 √ ) area in any straight-line or poly-line grid drawing. Such a result is achieved in two steps. First, we show that, in any straight-line or poly-line drawing of K2,n, one side of the bounding box has length Ω(n), thus answering two questions posed by Biedl et al. Second, we show a family of series-parallel graphs requiring Ω(2 √ )...

Most common defects are flicker, dirt, dust and line scratches.Here we consider line scratch detection.Line scratches appear as thin bright or dark line.This line are usually straight and vertical.The restoration of old videos is based on primary interest because of great quantity of old film records. But manual digital restoration of videos is time consuming process. To detect the scratch in f...

This article presents the problem of building bi-dimensional maps of environments when the sensor available is a camera used to detect edges crossing a single line of pixels and motion is restricted to a straight line along the optical axis. The position over time must be provided or assumed. Mapping algorithms for these conditions can be built with the landmark parameters estimated from sets o...