1. A driver assistance system, comprising: at least one camera for generating images of a surrounding of a vehicle; a data processing unit is configured to: define an image area located within the object in the image, decompose the image area into an array of subareas, define an array of aggregated pixel values by calculating, for each of the subareas, an aggregated pixel value of the respective subarea, calculate a gradient array depending on differences between the aggregated pixel values of adjacent subareas, analyze the gradient array, and identify depending on a result of the analyzing the gradient array, the object as belonging to a class of a predefined set of classes; and a driver information unit coupled to the data processing unit and providing information on the objects classified as traffic signs and/or speed limit signs to a driver of the vehicle, wherein the aggregated pixel values of the subareas are obtained by summing up pixel values of pixels contained in the respective subarea.