Communications: electrical – Digital comparator systems
Patent
1978-09-01
1981-03-31
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463AE, 3401463MA, G06K 970
Patent
active
042596610
ABSTRACT:
Apparatus and method are provided for recognizing a presented pattern such as a machine printed character. The apparatus includes a driving assembly for moving a character bearing medium into a scanning area. A pair of lamp sources illuminate the character in the scanning area. A monolithic photosensitive array responsive to the brightness of the reflective light from the illuminated character over a given time period is positioned opposite the scanning area. The photosensitive array or first storage circuit develops and stores an analog video signal which is subsequently converted into a digital representation of the analog signal by a signal processing circuit. A second storage circuit stores a multi-bit binary code representing the brightness of the present character. A segmentation circuit divides the binary representation of the character into 25 subregions and a summation circuit adds the numerical value of the multi-bit codes in each subregion together to obtain the corresponding summation for each subregion. A normalization circuit normalizes each of the subregions to form corresponding subregion densities which define components of a feature vector of a 25 dimensional orthogonal coordinate system. A vector normalizing circuit normalizes the length of the feature vector. A projecting circuit projects the normalized feature vector onto a set of predetermined subspaces comprising sets of eigenvectors each of the classes of characters to be recognized being represented by a set of eigenvectors. A selector circuit selects one of the characters as the present character according to a predetermined algorithm employing the results of the projections.
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Boudreau Leo H.
Burroughs Corporation
Cooper Kenneth J.
Fissell, Jr. Carl
Quarton Charles E.
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