Projection-Based Polygonality Measurement

Thanh Phương Nguyễn

doi:10.1109/TIP.2014.2370954

Projection-Based Polygonality Measurement

2015-01-01

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Thanh Phương Nguyễn *

T

Thai V. Hoang

DOI：10.1109/TIP.2014.2370954

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Measuring the degree to which a shape resembles a polygon (referred to as polygonality) is a difficult problem due to the intrinsic diversity in the form and distortion of shapes caused by digitization and similarity transformation. This paper proposes a generic approach for this problem by performing the measurement in the projection space where the Radon image of some primitive shapes, which compose the shape, becomes apparent. The obtained measures take value in (0, 1] with 1 corresponding to analytical polygons. They are robust to additive noise and boundary distortion, and is invariant to similarity transformation. The new framework generalizes existing polygonal measures such as triangularity and quadrangularity. In addition, the ability to estimate polygon's geometric quantities in the projection space allows approximating a shape by analytical polygons. The efficiency of the proposed approach is demonstrated through a number of experiments on both synthetic and real data sets.

Keyword:

Polygonality measurement

Radon transform

geometric quantity estimation

polygonal approximation

Projection-Based Polygonality Measurement

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