IMAGE ACQUISITION SYSTEM, IMAGE ACQUISITION METHOD, AND INSPECTION SYSTEM

摘要

The invention relates to an image acquisition system and an image acquisition method, as well as to an inspection system having at least one such image acquisition system. A projector projects a pattern on a surface of a sample, a camera records light intensity information from within at least two detection fields defined by the camera on the surface of the sample. A relative motion between the sample on the one hand and the camera and projector on the other hand is generated. From the acquired at least one image a height profile of the surface of the sample may be inferred. The pattern may comprise a number of sub-patterns related to each other by a phase shift. Alternatively, the pattern may be a fringe pattern.