Paper
15 February 2012 Recognition of sport players' numbers using fast-color segmentation
Cédric Verleysen, Christophe De Vleeschouwer
Author Affiliations +
Proceedings Volume 8305, Visual Information Processing and Communication III; 83050R (2012) https://doi.org/10.1117/12.908723
Event: IS&T/SPIE Electronic Imaging, 2012, Burlingame, California, United States
Abstract
This paper builds on a prior work for player detection, and proposes an efficient and effective method to distinguish among players based on the numbers printed on their jerseys. To extract the numbers, the dominant colors of the jersey are learnt during an initial phase and used to speed up the segmentation of the candidate digit regions. An additional set of criteria, considering the relative position and size (compared to the player bounding box) and the density (compared to the digit rectangular support) of the digit, are used to filter out the regions that obviously do not correspond to a digit. Once the plausible digit regions have been extracted, their recognition is based on feature-based classification. A number of original features are proposed to increase the robustness against digit appearance changes, resulting from the font thickness variability and from the deformations of the jersey during the game. Finally, the efficiency and the effectiveness of the proposed method are demonstrated on a real-life basketball dataset. It shows that the proposed segmentation runs about ten times faster than the mean-shift algorithm, but also outlines that the proposed additional features significantly increase the digit recognition accuracy. Despite significant deformations, 40% of the samples, that can be visually recognized as digits, are well classified as numbers. Out of these classified samples, more than 80% of them are correctly recognized. Besides, more than 95% of the samples, that are not numbers, are correctly identified as non-numbers.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Cédric Verleysen and Christophe De Vleeschouwer "Recognition of sport players' numbers using fast-color segmentation", Proc. SPIE 8305, Visual Information Processing and Communication III, 83050R (15 February 2012); https://doi.org/10.1117/12.908723
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Cited by 7 scholarly publications.
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KEYWORDS
Image segmentation

Detection and tracking algorithms

Feature extraction

Optical filters

Skin

Computing systems

Image processing

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