Abstract: A fingerprint imaging system includes a light source, an optical platen having a light receiving face positioned such that the light from the source impinges thereon, and a finger receiving face positioned such that light from the light source through the light receiving face impinges on the finger receiving face. A light detector is positioned to receive light from the light source reflected from the finger receiving face. The light receiving surface of the platen is configured to avoid reflection of external light passing through the finger receiving face and impinging on the light receiving face.

Abstract: A system for converting an image-enhanced digitized raster fingerprint image to vector lines in order to generate a unique identification value for the fingerprint. The raster image pixels are converted to vector lines along the fingerprint ridges and the vector lines are classified and converted according to type. The line types are then analyzed and a list of identification features corresponding to the vector line types is generated. The identification features between the vector line types are compared and the image is classified according to fingerprint class. A unique identification value is then generated by numerically encoding the classified identification features.

Abstract: A light table work station is provided for use in combination with a transparent prototype circuit board. At least a portion of each circuit trace on a circuit board is viewable when the board is populated with components, and back lit when the board is positioned on the work table, and each trace is also accessible from each side of the circuit board for examination, testing and/or modification. A work station is provided with a second upstanding light table for retaining transparent artwork sheets, each sheet bearing a copy of the circuit traces for each respective circuit plane on the circuit board.