Abstract:
The Dimensional Metrology Laboratory of Brazilian National Institute of Metrology, Standardization and Industrial Quality (Inmetro) is developing a system for measuring the area of circular apertures used in radiometric and photometric measurements. The system is based on the visualization of the area of the aperture with a microscope and the definition of the coordinates of the edges on the captured image. Once this coordinates are obtained, the area of the aperture is calculated using an average radius. In this context it is important to choose an efficient edge enhancement algorithm. This work presents a comparison between different algorithms for edge enhancement applied in the measurement of aperture area. We also discusses the related uncertainty concerning the measurement system, evaluating these diverse algorithms.
