A Multifocus Method for Controlling Depth of Field

When a photograph is taken with a camera, the lens is focused at a particular distance. Objects nearer or farther than this focal distance will appear blurred. By changing the focus of the lens, near objects or distant objects can be made to appear in sharp focus. If you want to create an image where distant objects as well as close objects are in focus, two or more images can be merged together to make an image with increased depth of field. This is done using a simplification of a pyramid-based technique described in [Ogden 85].