1. A method of image capture and processing, the method comprising: capturing a plurality of images with a camera, wherein the capturing is triggered by at least one user input, and wherein the plurality of images include a stack of images capturing a scene over a period of time; varying a focal length of the camera during the period of time such that each image of the stack of images is captured using a unique focal length; processing, with a processing unit, the plurality of images by: dividing each image of the stack of images into a plurality of regions, each region of the stack of images having a corresponding region in each image of the stack of images; receiving a selection, from a first image in the stack of images, of a region including an object; calculating a level of contrast for each region of a set of corresponding regions of the stack of images, the set of corresponding regions including the selected region; comparing levels of contrast for regions of the set of corresponding regions; determining a second image from the stack of images having a highest-level of contrast in the set of corresponding regions of the stack of images; determining whether the object within the selected region is present at a different location in the second image than a location of the object in the first image; and causing a display to show the second image with a notification that the object is present at the different location in at least the second image.