A local evaluation of vectorized documents by means of polygon assignments and matching |
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Authors: | R Raveaux J C Burie J M Ogier |
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Affiliation: | 1. L3I laboratory, University of La Rochelle, av M. Cr??peau, 17042, La Rochelle Cedex 1, France
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Abstract: | This paper presents a benchmark for evaluating the raster to vector conversion systems. The benchmark is designed for evaluating
the performance of graphics recognition systems on images that contain polygons (solid) within the images. Our contribution
is two-fold, an object mapping algorithm to spatially locate errors within the drawing and then a cycle graph matching distance
that indicates the accuracy of the polygonal approximation. The performance incorporates many aspects and factors based on
uniform units while the method remains non-rigid (thresholdless). This benchmark gives a scientific comparison at polygon
level of coherency and uses practical performance evaluation methods that can be applied to complete polygonization systems.
A system dedicated to cadastral map vectorization was evaluated under this benchmark and its performance results are presented
in this paper. By stress testing a given system, we demonstrate that our protocol can reveal strengths and weaknesses of a
system. The behavior of our set of indices was analyzed when increasing image degradation. We hope that this benchmark will
help assessing the state of the art in graphics recognition and current vectorization technologies. |
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