1. A method of selecting representative images from a group, comprising: selecting a dissimilarity measure by which to compute dissimilarities between features of respective images in the group; computing dissimilarities between the images in the group, based on the selected dissimilarity measure; determining a relative dissimilarity between each image and the other images in the group, based on the relative dissimilarity between the feature of the image and the features of the other images in the group; and selecting an image in the group as a representative image for display, using the relative dissimilarity of the image as a probability bias in the selection.