Introduction

Modern industrial processes require ever-improving optical inspection for the in-process evaluation and assessment of products. Over the past two decades, optical non-contact technologies have been developed which, under the collective term 'machine vision', have made a significant contribution to product or process evaluation. Nevertheless, many tasks remain unsolved, either because they could not be captured by grayscale or color cameras and are still assessed by trained employees using their eyes, or because only spectral single-channel sensors are used, for example, which cannot capture data from a larger area. Due to the increasing complexity in development and production, some requirements can no longer be solved satisfactorily with the existing methods of optical inspection and new approaches are required. One of these is (multi- or hyper-)spectral imaging. Integrated system solutions refer further to the industrial usage and are known commonly as Hyperspectral Vision.