title: Speckle activity images based on the spatial variance of the phase.
abstract: We propose the display of the local spatial variance of the temporal variations of the phase as an activity descriptor in dynamic speckle images. The spatial autocorrelation of the speckle intensity is calculated in sliding windows, and an estimation of the variance of the phase variations in each region of the sample is determined. The activity images obtained in this way depict some interesting features and in some cases they could be related to physical magnitudes in the samples. A simulation is presented, and examples corresponding to usual study cases are also shown, namely, fruit bruising and paint drying.
authors.affiliation: Centro de Investigaciones Optica and UID Optimo, Facultad de Ingeniería, Universidad National de la Plata, La Plata, Argentina. hrabal@ing.unlp.edu.ar
authors.forename: Héctor
authors.initials: H
authors.lastname: Rabal
authors.forename: Nelly
authors.initials: N
authors.lastname: Cap
authors.forename: Marcelo
authors.initials: M
authors.lastname: Trivi
authors.forename: Ricardo
authors.initials: R
authors.lastname: Arizaga
authors.forename: Alejandro
authors.initials: A
authors.lastname: Federico
authors.forename: Gustavo E
authors.initials: GE
authors.lastname: Galizzi
authors.forename: Guillermo H
authors.initials: GH
authors.lastname: Kaufmann