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Primary Examiner: Boudreau, Leo H.
Assistant Examiner:
Attorney: Mason, Kolehmainen, Rathburn & Wyss

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Title: Method and apparatus for identifying images

Abstract: A method and apparatus for identifying images having different spatial characteristics divides the image into a predetermined number of image elements, determines whether each of the image elements is relatively light or relatively dark and assigns a white designation or a black designation to each image element as a result of this determination. The number of white designated and black designated image elements are counted, as are the number of like designated image elements adjacent to each image element. The counts thus obtained are compared with corresponding counts resulting from known images, and the image is identified when a match within a predetermined tolerance is found.

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Inventors: Marshall, Robert (Clinton, IA, US)

Application Number: 942467
Filing Date: 1978-09-14
Publication_date: 1980-06-17
Assignee: A. C. Nielsen Company (Northbrook, IL)
Primary Class(es): 382/194 382/135, 382/205, 382/206
Other Classes:
US Patent Ref:

3165718	Jan, 1965	Fleisher	340/146.
3705383	Dec, 1972	Frayer	340/146.
3932839	Jan, 1976	Stephens	340/146.
4075604	Feb, 1978	Degasperi	340/146.

Other Refs: Other References: Buyle--Bodin et al., "A Letter Encoder After Analysis of Geometrical Char.", Proc. of Conf. on Machine Perception of Patterns, England, 4-1972, pp. 216-222.