Scaling of digital shapes with subpixel boundary estimation

Jack Koplowitz

doi:10.1117/12.44847

1 August 1991 Scaling of digital shapes with subpixel boundary estimation

Jack Koplowitz

Proceedings Volume 1470, Data Structures and Target Classification; (1991) https://doi.org/10.1117/12.44847
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Bilevel images consist of a grid of square cells, with side T, which are colored either black or white depending on whether the center of the cell lies in this black or white region of the pre- image. The digitized boundary can be interpreted as a 4-directional chain code. Subpixel accuracy is considered in determining the edge or boundary of the pre-image, and a practical algorithm is given for its implementation. In particular, small curving objects digitized on a coarse grid are considered. Experimental results show a surprisingly high degree of reconstruction, allowing for the upward scaling or enlargement of small objects from their digitized representation.

Citation Download Citation

Jack Koplowitz "Scaling of digital shapes with subpixel boundary estimation", Proc. SPIE 1470, Data Structures and Target Classification, (1 August 1991); https://doi.org/10.1117/12.44847

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