Method and device for the non-contact determination of color and intensity variations over time in objects

A device for non-contact determination of temporal color variations and/or intensity variations in objects in a scene, comprising:

• a first overview camera which is directed to the scene from a predetermined first viewing direction and which captures a first monoscopic overview image of the scene in a first spectral range,
• a second overview camera which is directed to the scene from a predetermined second viewing direction and which captures a second monoscopic overview image of the scene in the first spectral range, wherein the first viewing direction and the second viewing direction differ from one another,
• a detail camera which is directed to the scene from a predetermined third viewing direction, a position of which in relation to the first viewing direction and second viewing direction is known, and captures a two-dimensional detail image,
• a computer configured to calculate the first monoscopic overview image and the second monoscopic overview image to form a stereoscopic overview map and, based on the overview map, determine a spatial position of objects to be measured, project the two-dimensional detail image on the overview map and, based on the measurement criteria, select the measurement surfaces on the objects as regions of interest in the scene depending on parameters on which conclusions are to be drawn from the color variations and/or intensity variations, and
• a measurement camera which is directed to the scene from a predetermined fourth viewing direction, a position of which in relation to the first, second and third viewing directions is known, and light emitted from the measurement surfaces is detected in at least one measurement spectral range, which is predetermined as a function of the measurement criteria, in a spatially-resolved and wavelength-resolved manner in a continuous series of measurement images,
• wherein the computer is further configured to analyze the temporal variation in the intensity and/or color of the light in the at least one measurement spectral range in the series of measurement images and to transmit the results to a display unit.