Structured Lighting is used in a front lighting mode for applications requiring surface feature extraction.
Structured lighting is defined as the projection of a line or grid pattern of light onto an object.
The patterned light is then used to determine the three dimensional characteristics of an object from the resulting deflections observed. It produces a silhouette image and works best when a critical edge for dimensioning is desired. Diffuse backlighting places the target between the sensing lens and the light source. By illuminating the target from the rear with respect to the lens, the background appears uniformly white and the target is silhouetted. The result is a high contrast image, a black target against a white background.