User-guided white balance for mixed lighting conditions
ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH Asia 2012
Video matting using multi-frame nonlocal matting laplacian
ECCV'12 Proceedings of the 12th European conference on Computer Vision - Volume Part VI
A sparse control model for image and video editing
ACM Transactions on Graphics (TOG)
SimLocator: robust locator of similar objects in images
The Visual Computer: International Journal of Computer Graphics
Special Section on CAD/Graphics 2013: Confidence-driven image co-matting
Computers and Graphics
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We are interested in a general alpha matting approach for the simultaneous extraction of multiple image layers; each layer may have disjoint segments for material matting not limited to foreground mattes typical of natural image matting. The estimated alphas also satisfy the summation constraint. Our approach does not assume the local color-line model, does not need sophisticated sampling strategies, and generalizes well to any color or feature space in any dimensions. Our matting technique, aptly called KNN matting, capitalizes on the nonlocal principle by using K nearest neighbors (KNN) in matching nonlocal neighborhoods, and contributes a simple and fast algorithm giving competitive results with sparse user markups. KNN matting has a closed-form solution that can leverage on the preconditioned conjugate gradient method to produce an efficient implementation. Experimental evaluation on benchmark datasets indicates that our matting results are comparable to or of higher quality than state of the art methods.