Hierarchical operations on border attribute data for image regio

Details Hierarchical operations on border attribute data for image regio Hierarchical operations on border attribute data for image regio

1990-06-08

1993-07-27

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 11, 382 21, G06K 900

Patent

active

052316769

ABSTRACT:
A hierarchy of border attribute data items is produced from a body of data such as the pixel values of an image. Each border attribute data item indicates an attribute of a border of an analysis region of the image. The starting border attribute data items, at the lowest level of the hierarchy, are produced by operation on the pixel values. Each border attribute data item at a higher level in the hierarchy is produced by operating on a respective set of data items from the next lower level. The border attribute data items can indicate, for example, the number of black pixels in each border or the number of edge pixels in each border. Or the border attribute data items could include boolean values indicating whether any of the pixels in a border is a black pixel with a neighboring black pixel outside the border. For rectangular regions in a binary hierarchy, values for two borders can be added or logically combined at a first level and one of the values for the same two borders can be selected at the next higher level; one of the values for the other two borders can be selected at the first level and the values for those two borders can be added or logically combined at the next higher level.

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European Search Report and Annex, EP 9130 5166, Sep. 13, 1991.
Mahoney, J. V., Image Chunking: Defining Spatial Building Blocks for Scene Analysis, Dep't. of Elec. Eng. and Comp. Sci., M.I.T., 1987 ("the Mahoney thesis"), pp. 8-25.
Wocjik, Z. M., "An Approach to the Recognition of Contours and Line-Shaped Objects," Computer Vision, Graphics, and Image Processing, 25, 1984, pp. 184-204.

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