Abstract: A lantern is provided that comprises a case having a plurality of walls defining a case interior. The plurality of walls includes opposing front and rear walls. A lighting port is formed through the front wall and a faceplate assembly is disposed in the case interior in substantial registration with the lighting port. The faceplate assembly is disposed so that it engages a portion of the front wall surrounding the lighting port to seal the lighting port. A solid-state illuminator assembly is disposed in the case interior in substantial registration with the faceplate assembly and in contact with the faceplate assembly. A bracing arrangement is disposed intermediate the solid-state illuminator assembly and the rear wall. The bracing arrangement is in contact with the solid-state illuminator assembly and is configured to restrict rearward movement of the solid-state illuminator assembly and the faceplate assembly.

Abstract: A method for indoor navigation is disclosed.

Abstract: Digital maps digitized by scanning paper maps are smoothed by identifying regions which should be of a uniform color, empirically selecting sets of colors which the pixels of a given region might have in the raw map, empirically determining the statistical probability of occurrence of pixels of each color of the selected set in the region, defining groups of connected pixels having colors within the selected set, and resetting the color of all the pixels in a group to a predetermined region color if, and only if, the pixels of the group satisfy the determined statistical probability of occurrence. The inventive method provides uniform coloring of the map where desired, without affecting the sharpness of small-print map annotations.