Determining object properties with respect to particular optical measurement

A triangulation-based optical sensor comprising:

• a light emitting unit with a light source for providing defined measuring light (ID);
• at least one light receiving unit having a detector for detecting measuring light reflected and received from an object to be measured;
• and
• a controlling and processing unit adapted to derive distance information based on the detected reflection,
• wherein at least an arrangement of the light emitting unit and the light detection unit with known spatial position and orientation relative to each other defines measuring conditions of the optical sensor,
• wherein the controlling and processing unit comprises a pre-measuring functionality executing a determination of an object surface property related to an appearance of a defined point or of at least a part of a defined region of the object with respect to a particular optical measurement using the optical sensor, the determination of the object surface property being performed by:
• optically pre-measuring the point or region according to the following steps:
• illuminating the point or at least a part of the region with the measuring light (ID),
• capturing at least one image by means of the light receiving unit of at least one illumination at the object caused by illuminating the object, and
• analysing the at least one illumination regarding position or appearance unambiguity with respect to the measuring conditions of the optical sensor, or
• analysing a digital model of the object to be measured by performing the following steps:
• digitally aligning the digital model in accordance with an orientation of the object relative to the optical sensor, and
• determining appearance properties of the point or region based on the aligned model regarding an illumination with the measuring light (ID) in the orientation of the object relative to the optical sensor.