1. An electronic image capture system for capturing a reduced noise image of a scene, comprising a detector array and an image processing apparatus, the detector array being arranged to provide to the image processing apparatus data representing at least one image of a scene detected by the array, and the image processing apparatus holding a noise model that substantially characterises the noise performance of the image capture system, wherein the image processing apparatus is arranged to: identify, using the image data, one or more portions of the scene that would contribute disproportionately to visible noise in an image formed from said image data; and select an exposure pattern on the basis that said selected exposure pattern will reduce the contribution to the visible noise from said portions when exposures from said selected exposure pattern are combined to form the reduced noise image.