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Deep illumination angular domain imaging within highly scattering media enhanced by image processing

Deep Illumination Angular Domain Imaging employs a micromachined angular filter array to detect photons emitted from the scattered light created by a laser source aimed deep beneath the turbid medium surface. As this source light is scattered, a ball of illumination is formed within the medium. This deep illumination source emits scattered light in all directions and illuminates objects near the surface from behind. When photons from this illumination ball pass an object and reach the angular filter, light that was not subsequently scattered, passes through to a camera detector whereas scattered photons are rejected by the filter. The angular filter consists of an array of high-aspect ratio channels fabricated via silicon bulk micromachining. Under illumination by an argon ion (488-514 nm) laser, two-dimensional phantom test objects were observed in high scattering media up to 3 mm deep in the medium at effective scattering coefficients, μseff up to 5.8 cm-1. Scan results are reconstructed and enhanced using various image processing techniques to enhance the spatial image resolution and image contrast and to reduce noise.