An Object Shape and its Fourier Spectrum on Image Processing Measurement

Tsunehiko Nakanishi, Shigeru Takayama

Abstract

Sometimes indirect measurement methods are preferably used though basic measurements are achieved in the direct methods. The main scheme of an indirect measurement is a decision of an appropriate transducer. The transducers and methods of them have been shown in many textbooks of measurement engineering, and most of physical quantities are changed to electric quantity by higher order transformation on intelligent measurement methods.<BR />In higher-level measurement, electric quantity must be changed to appropriate dimension though the electric quantity is directly used in the usual measurement such as time domain. The amplitude probability density distribution analysis and Fourier transformation are examples of the higher-level measurement; the former is to change the time domain to amplitude domain and the latter is to change time domain to frequency domain. An appropriate projective space should be selected in the practical measurement. One of the frequency domain methods to measure an object shape using image processing method is shown in this report.

Keywords

spatial frequency, image processing, non-contact measurement

Download

IMEKO-TC1-2001-012.pdf

DOI

-

IMEKO TC

TC1 - Education and Training in Measurement and Instrumentation

Back to the proceedings