1. A method of reducing ghosts in images captured using a capsule endoscope, wherein captured images contain ghosts caused by reflections off capsule housing of the capsule endoscope by one or more light sources or one or more objects within the capsule endoscope illuminated by said one or more light sources, the method comprising: receiving a plurality of images captured by a camera of the capsule endoscope, wherein the capsule endoscope uses one or more light sources to illuminate objects in a field of view of the camera; deriving, from the plurality of images, a ghost model comprising ghost coefficients for relating light energies from said one or more light sources for a given image with ghost signals at multiple pixel locations for the given image; and generating de-ghosted images by compensating the plurality of images using estimated ghost signals based on derived ghost coefficients and the light energies from said one or more light sources.