Procedure for acquisition and analysis of speckle images.

<p>(a) sample; (b) image under white light; (c) image under coherent light; (d) image with false colors; (e) LASCA method.</p

Average intensity and standard deviation of a typical laserspeckle image of tooth enamel.

<p>Average intensity and standard deviation of a typical laserspeckle image of tooth enamel.</p

Typical LASCA maps of; (a) eroded tissue; (b) sound tissue.

<p>Typical LASCA maps of; (a) eroded tissue; (b) sound tissue.</p

Contrast ratio x acid etching duration (equal letters means statistical difference).

<p>The arrow means the group statistically differs from the reference contrast ratio 0%.</p

Schematic diagram of laser speckle imaging system.

<p>(a) HeNe laser emitting at 633 nm; (b) Beam expander lens; (c) CMOS camera; (d) samples.</p

Sample; (a) white light image; (b) coherent light image; (c) false color image with averaged intensity.

<p>Sample; (a) white light image; (b) coherent light image; (c) false color image with averaged intensity.</p