Adaptive monogenic filtering and normalization of ESPI fringe patterns.
A technique is presented for filtering and normalizing noisy fringe patterns, which may include closed fringes, so that single-frame demodulation schemes may be successfully applied. It is based on the construction of an adaptive filter as a linear combination of the responses of a set of isotropic bandpass filters. The space-varying coefficients are proportional to the envelope of the response of each filter, which in turn is computed by using the corresponding monogenic image [Felsberg and Sommer, IEEE Trans. Signal Process. 49, 3136 (2001)]. Some examples of demodulation of real Electronic Speckle Pattern Interferometry (ESPI) images patterns are presented.
Guerrero
J A
JA
Centro de Investigación en Matemáticas, Guanajuato, Mexico.
Marroquin
J L
JL
Rivera
M
M
Quiroga
J A
JA
D000465:Algorithms; D007089:Image Enhancement / Q000379:methods* / Q000592:standards; D007090:Image Interpretation, Computer-Assisted / Q000379:methods* / Q000592:standards; D016247:Information Storage and Retrieval / Q000379:methods*; D007368:Interferometry / Q000379:methods* / Q000592:standards; D012031:Refractometry / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted