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This includes the intelligent Quick Selection tool and automatic Magnetic Selection tool, where users roughly trace around an object and the app fits a precise line, using edge detection algorithms.
Shanggang Zhou, Xiaotong Shen, Spatially Adaptive Regression Splines and Accurate Knot Selection Schemes, Journal of the American Statistical Association, Vol. 96, No. 453 (Mar., 2001), pp. 247-259 ...