Abstract: The image pick-up apparatus includes a plurality of image sensors (2, 3) for picking up sub-images by deriving sub-image signals from sub-images and also a correction system (4, 43, 44, 45) for deriving corrected brightness values from brightness values of the sub-images and a correction signal. The correction system is provided with a light source (4), for example a LED, for exposing at least one of the image sensors in order to generate one or more measurement signals from the exposed image sensor or sensors. The correction system is arranged to derive the correction signal from the one or more measurement signals. An image pick-up apparatus of this kind is used, for example in an X-ray examination apparatus.

Abstract: An image pick-up apparatus (1) comprises a plurality of image sensors (2, 3) for picking up sub-images and for supplying electronic sub-image signals. A combination unit (4) forms an electronic image signal for a composite image from the sub-image signals. The image pick-up apparatus also comprises a correction unit (5) for compensating differences in the electronic sub-image signals which are not related to image information per se. To this end, the correction unit (5) multiplies brightness values of a first sub-image per image column and brightness values of a second sub-image per image line. Suitable gain factors are iteratively determined, using a bisection method, from the instantaneous image being picked up, or from a reference image, and are stored in a memory.