CDTW cannot be computed exactly under the Euclidean 2-norm with algebraic operations alone, but exact algorithms exist for approximating norms with generalizations to arbitrary norms and partial Fréchet similarity.
Curve matching, time warping, and light fields: New algorithms for computing similarity between curves
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Fundamentals of Computing Continuous Dynamic Time Warping in 2D under Different Norms
CDTW cannot be computed exactly under the Euclidean 2-norm with algebraic operations alone, but exact algorithms exist for approximating norms with generalizations to arbitrary norms and partial Fréchet similarity.