Optics: measuring and testing – Document pattern analysis or verification
Patent
1974-07-22
1977-05-24
Corbin, John K.
Optics: measuring and testing
Document pattern analysis or verification
356106R, G06K 908, G01B 902
Patent
active
040251950
ABSTRACT:
A system for adding or subtracting in real-time image detail of first and second images. In a first embodiment a plane parallel reflective image shear plate superimposes a first radiation beam carrying the first image with a second radiation beam carrying the second image to achieve exact registration of similar image detail. Depending upon the phase difference between the first and second beams, the beams either destructively or constructively interfere. Constructive interference results in amplitude addition of image detail in the first and second images. Destructive interference results in an image having only image detail which is different between the first and second images. A second embodiment adds a plane parallel source shear plate to the structure of the first embodiment, which results in several significant advantages. In the second embodiment radiation from a light source is first directed against the source shear plate which shears the radiation to derive the first and second radiation beams. The first and second radiation beams are then directed against the image shear plate which recombines the beams for interference while cancelling wavefront aberrations.
In a third embodiment of the invention, first and second radiation beams carrying details of first and second images are directed against a triangular configuration of a beam splitter and first and second mirrors which function together to superimpose the first and second radiation beams to achive exact registration of similar image detail. A fourth embodiment adds another triangular configuration of beam splitter and first and second mirrors to the structure of the third embodiment. The additional structure is utilized to shear a radiation beam from a source to derive the first and second radiation beams. The first and second radiation beams are then directed against the structure of the third embodiment which recombines the beams for interferencewhile cancelling wavefront aberrrations.
In a fifth embodiment, the reflective surfaces of a MachZehnder interferometer are utilized to combine first and second beams carrying details of first and second images for either constructive or destructive interference.
REFERENCES:
patent: 2764055 (1956-09-01), Clemens et al.
patent: 3586416 (1971-06-01), DeBitetto
patent: 3624605 (1971-11-01), Aagard
patent: 3680963 (1972-08-01), Edwards et al.
patent: 3816649 (1974-06-01), Butters et al.
Ebersole John F.
Wyant James C.
Blair Homer O.
Clark Conrad
Corbin John K.
Glanzman Gerald H.
Itek Corporation
LandOfFree
Image subtraction/addition system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image subtraction/addition system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image subtraction/addition system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-533259