The invention relates to a control system for an autonomous garden tool that is equipped with at least one camera and one motor. The control system comprises a camera control module and an image generation module. With the camera control module the camera settings are controlled that are used for capturing images. With the image generation module two consecutive images in a sequence of images that is captured by the camera is determined whereby theses two consecutive images are captured on the basis of different camera settings. The two determined pictures are used as a basis for generating an HDR image in an HDR mode of the control system.