Method for a stereo camera system for detecting deviations from a calibration, the stereo camera system having a first camera and a second camera, the cameras (K1, K2) being directed from different viewing directions onto a target field, having the steps: - recording a first image of the target field by means of the first camera of the stereo camera system, - recording a second image of the target field by means of the second camera of the stereo camera system, - determination of an examination point, characterized in that the method further comprises: - calculating a first line of sight between the first camera and the determined examination point using the stored calibration parameter from the first image and the second image, - calculating a second line of sight between the second camera and the determined examination point using the stored calibration parameter from the first image and the second image, - determination of a distance of the first line of sight to the second line of sight, - comparison of the distance (d) with a predetermined value, - wherein if the distance (d) is greater than a predetermined value, an incorrect calibration is indicated, and wherein - in case of an incorrect calibration, at least one calibration parameter is changed and a first line of sight and a second line of sight are then recalculated, wherein a distance of the first line of sight from the second line of sight then being determined again, wherein the changed calibration parameter being adopted for subsequent measurements if the distance now determined is less than the previously determined distance. - recording a first image of the target field by means of the first camera of the stereo camera system, - recording a second image of the target field by means of the second camera of the stereo camera system, - determination of an examination point, characterized in that the method further comprises: - calculating a first line of sight between the first camera and the determined examination point using the stored calibration parameter from the first image and the second image, - calculating a second line of sight between the second camera and the determined examination point using the stored calibration parameter from the first image and the second image, - determination of a distance of the first line of sight to the second line of sight, - comparison of the distance (d) with a predetermined value, - wherein if the distance (d) is greater than a predetermined value, an incorrect calibration is indicated, and wherein - in case of an incorrect calibration, at least one calibration parameter is changed and a first line of sight and a second line of sight are then recalculated, wherein a distance of the first line of sight from the second line of sight then being determined again, wherein the changed calibration parameter being adopted for subsequent measurements if the distance now determined is less than the previously determined distance. - calculating a first line of sight between the first camera and the determined examination point using the stored calibration parameter from the first image and the second image, - calculating a second line of sight between the second camera and the determined examination point using the stored calibration parameter from the first image and the second image, - determination of a distance of the first line of sight to the second line of sight, - comparison of the distance (d) with a predetermined value, - wherein if the distance (d) is greater than a predetermined value, an incorrect calibration is indicated, and wherein - in case of an incorrect calibration, at least one calibration parameter is changed and a first line of sight and a second line of sight are then recalculated, wherein a distance of the first line of sight from the second line of sight then being determined again, wherein the changed calibration parameter being adopted for subsequent measurements if the distance now determined is less than the previously determined distance.