In this paper, we propose an orientation-matching functional minimization for image denoising and image inpainting. Following the two-step TV-Stokes algorithm (Rahman et al. in Scale space and variational methods in computer vision, pp. 473–482, Springer, Heidelberg, 2007; Tai et al. in Image processing based on partial differential equations, pp. 3–22, Springer, Heidelberg, 2006; Bertalmio et al. in Proc. conf. comp. vision pattern rec., pp. 355–362, 2001), a regularized tangential vector field with zero divergence condition is first obtained. Then a novel approach to reconstruct the image is proposed. Instead of finding an image that fits the regularized normal direction from the first step, we propose to minimize an orientation matching cost measuring the alignment between the image gradient and the regularized normal direction. This functional yields a new nonlinear partial differential equation (PDE) for reconstructing denoised and inpainted images. The equation has an adaptive diffusivity depending on the orientation of the regularized normal vector field, providing reconstructed images which have sharp edges and smooth regions. The additive operator splitting (AOS) scheme is used for discretizing Euler-Lagrange equations. We present the results of various numerical experiments that illustrate the improvements obtained with the new functional.
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The research is supported by MOE (Ministry of Education) Tier II project T207N2202 and IDM project NRF2007IDMIDM002-010. In addition, the support from SUG 20/07 is also gratefully acknowledged. Professor A.M. Bruckstein’s work was supported in part by an NTU Joint visiting professorship at the School of Physical and Mathematical Sciences and the Institute for Media Innovations.
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Hahn, J., Tai, X., Borok, S. et al. Orientation-Matching Minimization for Image Denoising and Inpainting. Int J Comput Vis 92, 308–324 (2011). https://doi.org/10.1007/s11263-010-0371-5
- Orientation-matching minimization
- TV-Stokes equation
- Image denoising
- Image inpainting