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Abstract In this paper we discuss certain theoretical properties of the algorithm selection approach to the problem of semantic segmentation in computer vision. High quality algorithm selection is possible only if each algorithm’s suitability is well known because only then the algorithm selection result can improve the best possible result given by a single algorithm. We show that an algorithm’s evaluation score depends on final task; i.e. to properly evaluate an algorithm and to determine its suitability, only well formulated tasks must be used. When algorithm suitability is well known, the algorithm can be efficiently used for a task by applying it in the most favorable environmental conditions determined during the evaluation. The task dependent evaluation is demonstrated on segmentation and object recognition. Additionally, we also discuss the importance of high level symbolic knowledge in the selection process. The importance of this symbolic hypothesis is demonstrated on a set of learning experiments with a Bayesian Network, a SVM and with statistics obtained during algorithm selector training. We show that task dependent evaluation is required to allow efficient algorithm selection. We show that using symbolic preferences of algorithms, the accuracy of algorithm selection can be improved by 10 to 15% and the symbolic segmentation quality can be improved by up to 5% when compared with the best available algorithm. References Rice J. The algorithm selection problem / J. Rice // Advances in Computers. – 1976. – Vol. 15. – P. 65–118. 2. Lukac M. Machine learning based adaptive contour detection using algorithm selection and image splitting / M. Lukac, R. Tanizawa, M. Kameyama // Interdisciplinary Information Sciences. – 2012. – Vol. 18, № 2. – P. 123–134. 3. Lukac M. Natural image understanding using algorithm selection and high level feedback / M. Lukac, M. Kameyama, K. Hiura // SPIE Intelligent Robots and Computer Vision XXX: algorithms and Techniques. – 2013. DOI: 10.1117/12.2008593 4. Zhang Y. Optimal selection of segmentation algorithms based on performance evaluation / Y. Zhang and H. Luo // Optical Engineering. – 2000. – Vol. 39, № 6. – P. 1450–1456. 5. Yong X. Optimal selection of image segmentation algorithms based on performance prediction / X. Yong, D. Feng, Z. Rongchun // Proceedings of the Pan-Sydney Area Workshop on Visual Information Processing (VIP2003). – 2003. – P. 105–108. 6. Yu L. Feature selection for high-dimensional data: A fast correlationbased filter solution / L. Yu, H. Liu // Proceedings of the 20th International Conference on Machine Learning. – 2004. – P. 856–863. 7. Takemoto S. Algorithm selection for intracellular image segmentation based on region similarity / S. Takemoto, H. Yokota // Ninth International Conference on Intelligent Systems Design and Applications. –2009. – P. 1413–1418. DOI: 10.1109/ISDA.2009.205 8. Lukac M. Bayesian-network-based algorithm selection with high level representation feedback for real-world intelligent systems / M. Lukac, and M. Kameyama // Information Technology in Industry. – 2015. – Vol. 3, № 1. – P. 10–15. 9. Peng B. Parameter selection for graph cut based image segmentation / B. Peng, V. Veksler // In Proceedings of the British Conference on Computer Vision. – 2008. – P. 16.1–16.10. DOI: 10.5244/C.22.16 10. Hoiem D. Closing the loop on scene interpretation / D. Hoiem, A. A. Efros, M. Hebert // Proc. Computer Vision and Pattern Recognition (CVPR). – 2008. – P. 1–8. DOI: 10.1109/ CVPR.2008.4587587

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