Abstract
Active shape model (ASM), as a method for extracting and representing object shapes, has received considerable attention in recent years. In ASM, a shape is represented statistically by a set of well-defined landmark points and its variations are modeled by the principal component analysis (PCA). However, we find that both PCA and Procrustes analysis are sensitive to noise, and there is a linear relationship between alignment error and magnitude of noise, which leads parameter estimation to be ill-posed. In this paper, we present a sparse ASM based on l 1-minimization for shape alignment, which can automatically select an effective group of principal components to represent a given shape. A noisy item is introduced to both shape parameter and pose parameter (scale, translation, and rotation), and the parameter estimation is solved by the l 1-minimization framework. The estimation of these two kinds of parameters is independent and robust to local noise. Experiments on face dataset validate robustness and effectiveness of the proposed technique.
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Guo, Y., He, R., Zheng, WS., Kong, X. (2012). Active Shape Model Based on Sparse Representation. In: Zheng, WS., Sun, Z., Wang, Y., Chen, X., Yuen, P.C., Lai, J. (eds) Biometric Recognition. CCBR 2012. Lecture Notes in Computer Science, vol 7701. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35136-5_12
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DOI: https://doi.org/10.1007/978-3-642-35136-5_12
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