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Darkfield Illumination

In microscopy, refers to light that enters a translucent object through the edge perpendicular to the lens. In machine vision, an illumination geometry which has most of the light bounce off of the object; light from edges and surface defects is scattered to the detector yielding a high contrast bright spot. 

See also Axial Illumination , Glancing Illumination , Diffuse Illumination , Directional Illumination

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