Estudio comparativo de distintos procedimientos de detección de los cambios de intensidad existentes en una imagen

Résumé

It was compared the performance of four local intensity changes detectors: Sobel, Prewitt, Roberts and Laplacian operators. For the test, it was used computer simulated geometrical figures which made possible to generate edges with different shapes, slopes, orientations and noise levels, and natural images. Both groups of images were filtered too by a set of different size Gaussian operators to study the detectors behavior with images at different resolution levels. The comparison was done by using quantitative and qualitative measures, for the geometrical images, and by visual judgment, for the natural ones. The results showed that the principal differences between the operators are their noise sensitivity and the edges wideness they detects.