1. A digital image acquisition system, comprising an apparatus for capturing digital images and a digital processing component for initiating a new image capture upon determining that a threshold camera motion blur has occurred in a captured digital image based on a comparison of image data of a captured digital image and one or more relatively low resolution reference images each acquired with a same sensor, such that at least a same portion of said same sensor captures at least a portion of said image data of each of said captured digital image and said one or more relatively low resolution reference images within a temporal range that includes an exposure period of the captured digital image, and times proximately before and after said exposure period, and of nominally the same scene as that of the captured digital image, and wherein said image data of said captured digital image and said one or more relatively low resolution reference images comprises said captured image and at least one of the one or more relatively low resolution reference images taken outside the exposure period of said captured image, and wherein said digital processing component is arranged first to align at least portions of the image data of said captured digital image and said one or more relatively low resolution reference images, and then to compare the image data of said captured digital image and said one or more relatively low resolution reference images for determining a camera motion blur function, and to determine whether to de-blur said captured image depending on whether the camera motion blur function indicates that sufficient or insufficient blur exists.