1. A method for combining a plurality of new images into an existing database of chronologically ordered images, said database images being classified into event groups based upon a time difference threshold, and within event groups into event subgroups based upon a similarity measure, said method comprising the steps of: assessing one or more image features of each of said new images; ordering said new images into clusters based upon said image features; selecting a representative image in each of said clusters; designating a segment of said database images chronologically overlapping said new images; identifying in said segment, a set of one or more of said database images similar to each of said representative images to provide sets of retrieved images; associating different event subgroups including one or more of said retrieved images with each of said clusters to provide matched subgroups; assigning said new images to said matched subgroups associated with respective said clusters.