Fausta Squatriti. Plumb-line (2010)

A simple but effective improvement to the plumb-line algorithm

In this paper, we propose an improved plumb-line algorithm, the Partial-Scan Plumb-Line (PSPL) algorithm, to solve the point-in-region problem. In the PSPL algorithm, every edge of the region (or polygon) is represented as two half segments, and all half segments of the region are sorted according to their dominating points. This is a standard representation for regions in spatial databases, pr...

Comparative Geometric Tests of Industrial and Scientific Ccd Cameras Using Plumb Line and Test Range Calibrations

Small format, medium resolution CCD cameras are at present widely used for industrial metrology applications. Large format, high resolution CCD cameras are principally used for scientific applications, but are slowly infiltrating photogrammetry and dramatically improving the object space accuracy achievable by close range measurement. The calibration of all types of CCD cameras is necessary in ...

Unsupervised Intrinsic Calibration from a Single Frame Using a "Plumb-Line" Approach

Estimating the amount and center of distortion from lines in the scene has been addressed in the literature by the socalled “plumb-line” approach. In this paper we propose a new geometric method to estimate not only the distortion parameters but the entire camera calibration (up to an “angular” scale factor) using a minimum of 3 lines. We propose a new framework for the unsupervised simultaneou...

plumb as a cause of kidney cancer (case study:iran from 2008-2010)

background: the main threats to human health from heavy metals are associated with exposure to plumb (pb), cadmium, mercury, and arsenic. some hazards that threat human health are the results of environmental factors and the relevant pollutions. some important categories of diseases including (cancers) have considerable differences in various places, as observed in their spatial prevalence and ...

Out of Plumb: When Water Treatment Causes Lead Contamination