Fig 1.
Schematic diagram of laser speckle imaging system.
(a) HeNe laser emitting at 633 nm; (b) Beam expander lens; (c) CMOS camera; (d) samples.
Fig 2.
Procedure for acquisition and analysis of speckle images.
(a) sample; (b) image under white light; (c) image under coherent light; (d) image with false colors; (e) LASCA method.
Fig 3.
Sample; (a) white light image; (b) coherent light image; (c) false color image with averaged intensity.
Fig 4.
Average intensity and standard deviation of a typical laserspeckle image of tooth enamel.
Fig 5.
Typical LASCA maps of; (a) eroded tissue; (b) sound tissue.
Fig 6.
Contrast ratio x acid etching duration (equal letters means statistical difference).
The arrow means the group statistically differs from the reference contrast ratio 0%.