1. A lifelog camera that processes a collection of still images for efficient transfer to an external memory, comprising: a camera module that captures still images according to an image capture routine of the lifelog camera; a memory in which the captured images are stored; and a control circuit configured to: generate a thumbnail image for each stored image, each thumbnail image stored in the memory at a resolution less than a resolution of the corresponding image; analyze the thumbnail images to identify one or more thumbnail images that meet transfer criteria; and tag for transfer the images that correspond to the thumbnail images that meet the transfer criteria.