Method and device for photometric measurement of vehicle license plate

The invention relates to a method for photometric measurement of a reflection reference (Z) illuminated by at least one license plate lamp (1). A camera (4), which can be triggered by means of a control unit (5), is arranged and oriented relative to a holding device (3) designed to receive a reflection reference in such a way that a brightness image (B1, B2) captured by the camera covers at least a reflection surface (Z.1) of the reflection reference received by the holding device. The license plate lamp is arranged in a positioning device (2) which can be moved by means of a control unit. The positioning device is actuated by means of the control unit in such a way that the license plate lamp arranged in the positioning device is moved to at least one position (P1, P2) relative to the reflection reference arranged in the holding device, optionally moved in sequence to a plurality of positions and held there. A capture of the luminance image is triggered in each position. A total image (B) is configured from