Ferramenta para extrair de coordenadas reais de imagens digitais

Abstract

In this work, the objective was to develop a digitizer, in the form of web application, to extract world coordinates from images of XY-type graphs with Cartesian axes represented in linear scales. The analysis of 13 digitizing tools served as a basis for the implementation of some functionalities such as the display of statistical parameters associated with the definition of scale, as well as improvements in the definition of control points, which contributes to the configuration of more reliable scales and, consequently, more results accurate. The mathematical model used to adjust the scale equations was the same to perform linear geometric transformations affine in the plane and, to validate it, a unit radius circumference contained in an image transformed by shear and then by rotation was digitized. The statistical analysis showed excellent results, which allow us to conclude that the mathematical model was used correctly.