1. A method for capturing in-vivo images, the method comprising: capturing an in-vivo image using an autonomous in vivo device, said device comprising a housing containing an imager, an optical system, an illumination device, a processor and a transmitter, wherein said image is captured with a distortion effect; digitally overlaying a non-linear scale on the in-vivo image in accordance with said distortion effect in order to enable a viewer to estimate the size of an object within the image.