1. A method comprising: obtaining, by a processor, a cropping window in a picture comprising a plurality of objects of interest; detecting, by the processor, each object of interest of said plurality of objects; determining, by the processor, a weight for each of said detected object of interest, wherein said weight is determined at least based on a size of the corresponding detected object of interest; modifying, by the processor, a position of the cropping window in said picture based on said weights; and cropping, by the processor, the picture part delimited by said cropping window to generate a reduced size version of the picture for display on a screen of a display device, wherein modifying the position of the cropping window in said picture based on said weights comprises: a) ordering, by the processor, said plurality of objects of interest in a decreasing order of said weights to form an ordered list of objects of interest; b) modifying, by the processor, the position of the cropping window so that it is centered on a bounding box comprising at least the first object of interest of the ordered list; c) enlarging, by the processor, said bounding box by adding a next object of interest of the ordered list; d) repeating b) and c) until the bounding box becomes larger than the cropping window.