Abstract: There are provided an optical computing method and system for inspecting in through light a container. The container is illuminated by elementary emitting areas each emitting a polarized emitted light with an emitted polarization property of interest that varies according to a law of periodic variation which, over a primary period, follows a triangular variation as a function of the position of the elementary emitting area along the primary direction. Digital images are acquired, with at least one camera, with interposition of a linear analyzer having a given axis of polarization for a partial digital image. At least one primary raw refraction image is calculated, each pixel of which is representative of the refraction undergone by the light. The system advantageously includes a two-dimensional matrix of liquid crystal cells.

Abstract: The invention relates to an optical computing method and system for inspecting in through light a container (12), in which: the container is illuminated by elementary emitting areas each emitting a polarized emitted light with an emitted polarization property of interest that varies according to a law of periodic variation which, over a primary period (T1), follows a triangular variation as a function of the position of the elementary emitting area along the primary direction (D1); digital images are acquired, with at least one camera, with interposition of a linear analyzer (30(n,k); 30.1, 30.2) having a given axis of polarization (Ak) for a partial digital image ((Ipk.m); at least one primary raw refraction image (IR1) is calculated, each pixel of which is representative of the refraction undergone by the light. The system advantageously includes a two-dimensional matrix (16c) of liquid crystal cells.